2017 Form 10-K Financial Statement
#000009212218000012 Filed on February 21, 2018
Income Statement
| Concept | 2017 | 2016 Q4 | 2016 Q3 |
|---|---|---|---|
| Revenue | $23.03B | $5.181B | $6.264B |
| YoY Change | 15.76% | 45.21% | 15.98% |
| Cost Of Revenue | $2.977B | $748.0M | $444.0M |
| YoY Change | 83.43% | 442.03% | 130.05% |
| Gross Profit | $20.05B | $4.433B | $5.820B |
| YoY Change | 9.75% | 29.24% | 11.75% |
| Gross Profit Margin | 87.07% | 85.56% | 92.91% |
| Selling, General & Admin | |||
| YoY Change | |||
| % of Gross Profit | |||
| Research & Development | |||
| YoY Change | |||
| % of Gross Profit | |||
| Depreciation & Amortization | $3.457B | $814.0M | $803.0M |
| YoY Change | 18.27% | 33.88% | 30.36% |
| % of Gross Profit | 17.24% | 18.36% | 13.8% |
| Operating Expenses | $14.40B | $3.782B | $3.815B |
| YoY Change | 7.79% | 41.7% | 11.91% |
| Operating Profit | $2.333B | $587.0M | $1.917B |
| YoY Change | -47.99% | 1.56% | 16.25% |
| Interest Expense | -$1.588B | -$373.0M | -$374.0M |
| YoY Change | 26.23% | 81.95% | 71.56% |
| % of Operating Profit | -68.07% | -63.54% | -19.51% |
| Other Income/Expense, Net | -$1.265B | $168.0M | -$301.0M |
| YoY Change | 25.75% | 300.0% | 68.16% |
| Pretax Income | $1.068B | $239.0M | $1.616B |
| YoY Change | -69.31% | -42.41% | 9.93% |
| Income Tax | $142.0M | $34.00M | $439.0M |
| % Of Pretax Income | 13.3% | 14.23% | 27.17% |
| Net Earnings | $926.0M | $208.0M | $1.177B |
| YoY Change | -63.38% | -26.5% | 21.34% |
| Net Earnings / Revenue | 4.02% | 4.01% | 18.79% |
| Basic Earnings Per Share | $0.84 | $0.20 | $1.18 |
| Diluted Earnings Per Share | $0.84 | $0.20 | $1.17 |
| COMMON SHARES | |||
| Basic Shares Outstanding | 1.000B shares | 968.0M shares | |
| Diluted Shares Outstanding | 1.008B shares | 975.0M shares |
Balance Sheet
| Concept | 2017 | 2016 Q4 | 2016 Q3 |
|---|---|---|---|
| SHORT-TERM ASSETS | |||
| Cash & Short-Term Investments | $2.130B | $1.975B | $2.669B |
| YoY Change | 7.85% | 40.67% | 140.67% |
| Cash & Equivalents | $2.130B | $1.975B | $2.669B |
| Short-Term Investments | |||
| Other Short-Term Assets | $2.077B | $230.0M | $168.0M |
| YoY Change | 10.42% | 223.94% | -89.74% |
| Inventory | $2.627B | $2.782B | $2.559B |
| Prepaid Expenses | $364.0M | $459.0M | |
| Receivables | $1.762B | $1.522B | $1.675B |
| Other Receivables | $1.476B | $1.562B | $897.0M |
| Total Short-Term Assets | $10.07B | $9.722B | $9.658B |
| YoY Change | 3.6% | 48.97% | 54.04% |
| LONG-TERM ASSETS | |||
| Property, Plant & Equipment | $79.87B | $78.45B | $75.55B |
| YoY Change | 1.82% | 28.36% | 29.72% |
| Goodwill | $6.251B | $6.223B | |
| YoY Change | 312450.0% | ||
| Intangibles | $970.0M | $942.0M | |
| YoY Change | 205.99% | ||
| Long-Term Investments | $1.513B | $1.549B | $1.541B |
| YoY Change | -2.32% | 25716.67% | |
| Other Assets | $12.41B | $1.406B | $1.133B |
| YoY Change | -2.67% | 90.77% | -88.95% |
| Total Long-Term Assets | $100.9B | $99.98B | $96.70B |
| YoY Change | 0.96% | 39.26% | 40.26% |
| TOTAL ASSETS | |||
| Total Short-Term Assets | $10.07B | $9.722B | $9.658B |
| Total Long-Term Assets | $100.9B | $99.98B | $96.70B |
| Total Assets | $111.0B | $109.7B | $106.4B |
| YoY Change | 1.19% | 40.07% | 41.41% |
| SHORT-TERM LIABILITIES | |||
| YoY Change | |||
| Accounts Payable | $3.081B | $2.228B | $1.732B |
| YoY Change | -7.03% | 16.96% | 22.06% |
| Accrued Expenses | $2.060B | $2.100B | $1.787B |
| YoY Change | -1.9% | 39.07% | 21.23% |
| Deferred Revenue | |||
| YoY Change | |||
| Short-Term Debt | $2.439B | $2.241B | $1.670B |
| YoY Change | 8.84% | 62.86% | 12.08% |
| Long-Term Debt Due | $3.892B | $2.587B | $2.254B |
| YoY Change | 50.44% | -3.25% | -31.96% |
| Total Short-Term Liabilities | $13.59B | $12.92B | $10.57B |
| YoY Change | 5.24% | 41.49% | 9.06% |
| LONG-TERM LIABILITIES | |||
| Long-Term Debt | $44.46B | $42.63B | $41.55B |
| YoY Change | 4.3% | 72.67% | 86.11% |
| Other Long-Term Liabilities | $10.73B | $880.0M | $641.0M |
| YoY Change | 0.13% | 29.79% | -91.93% |
| Total Long-Term Liabilities | $55.19B | $880.0M | $641.0M |
| YoY Change | 3.46% | 29.79% | -97.88% |
| TOTAL LIABILITIES | |||
| Total Short-Term Liabilities | $13.59B | $12.92B | $10.57B |
| Total Long-Term Liabilities | $55.19B | $880.0M | $641.0M |
| Total Liabilities | $86.51B | $82.80B | $80.02B |
| YoY Change | 2.73% | 47.4% | 48.66% |
| SHAREHOLDERS EQUITY | |||
| Retained Earnings | $10.36B | $10.69B | |
| YoY Change | 3.46% | ||
| Common Stock | $14.61B | $14.12B | |
| YoY Change | 34.63% | ||
| Preferred Stock | |||
| YoY Change | |||
| Treasury Stock (at cost) | $31.00M | $30.00M | |
| YoY Change | -78.17% | ||
| Treasury Stock Shares | 800.0K shares | 800.0K shares | |
| Shareholders Equity | $24.49B | $24.76B | $24.55B |
| YoY Change | |||
| Total Liabilities & Shareholders Equity | $111.0B | $109.7B | $106.4B |
| YoY Change | 1.19% | 40.07% | 41.41% |
Cashflow Statement
| Concept | 2017 | 2016 Q4 | 2016 Q3 |
|---|---|---|---|
| OPERATING ACTIVITIES | |||
| Net Income | $926.0M | $208.0M | $1.177B |
| YoY Change | -63.38% | -26.5% | 21.34% |
| Depreciation, Depletion And Amortization | $3.457B | $814.0M | $803.0M |
| YoY Change | 18.27% | 33.88% | 30.36% |
| Cash From Operating Activities | $6.394B | $598.0M | $2.156B |
| YoY Change | 30.65% | -49.58% | -27.68% |
| INVESTING ACTIVITIES | |||
| Capital Expenditures | $7.423B | -$2.058B | -$1.766B |
| YoY Change | 1.55% | -25.84% | -10.4% |
| Acquisitions | $1.054B | ||
| YoY Change | -90.13% | ||
| Other Investing Activities | $53.00M | -$1.350B | -$2.199B |
| YoY Change | -56.56% | -460.0% | 1437.76% |
| Cash From Investing Activities | -$7.190B | -$3.408B | -$3.965B |
| YoY Change | -64.13% | 42.0% | 87.56% |
| FINANCING ACTIVITIES | |||
| Cash Dividend Paid | |||
| YoY Change | |||
| Common Stock Issuance & Retirement, Net | -$793.0M | ||
| YoY Change | -78.9% | ||
| Debt Paid & Issued, Net | |||
| YoY Change | |||
| Cash From Financing Activities | $951.0M | 2.116B | 2.581B |
| YoY Change | -93.95% | 40.23% | -552.01% |
| NET CHANGE | |||
| Cash From Operating Activities | $6.394B | 598.0M | 2.156B |
| Cash From Investing Activities | -$7.190B | -3.408B | -3.965B |
| Cash From Financing Activities | $951.0M | 2.116B | 2.581B |
| Net Change In Cash | $155.0M | -694.0M | 772.0M |
| YoY Change | -72.9% | -335.25% | 160.81% |
| FREE CASH FLOW | |||
| Cash From Operating Activities | $6.394B | $598.0M | $2.156B |
| Capital Expenditures | $7.423B | -$2.058B | -$1.766B |
| Free Cash Flow | -$1.029B | $2.656B | $3.922B |
| YoY Change | -57.41% | -32.95% | -20.8% |
Facts In Submission
| Frame | Concept Type | Concept / XBRL Key | Value | Unit |
|---|---|---|---|---|
| CY2017 | dei |
Amendment Flag
AmendmentFlag
|
false | |
| CY2017 | dei |
Current Fiscal Year End Date
CurrentFiscalYearEndDate
|
--12-31 | |
| CY2017 | dei |
Document Fiscal Period Focus
DocumentFiscalPeriodFocus
|
FY | |
| CY2017 | dei |
Document Fiscal Year Focus
DocumentFiscalYearFocus
|
2017 | |
| CY2017 | dei |
Document Period End Date
DocumentPeriodEndDate
|
2017-12-31 | |
| CY2017 | dei |
Document Type
DocumentType
|
10-K | |
| CY2017 | dei |
Entity Central Index Key
EntityCentralIndexKey
|
0000092122 | |
| CY2018Q1 | dei |
Entity Common Stock Shares Outstanding
EntityCommonStockSharesOutstanding
|
1008159482 | shares |
| CY2017 | dei |
Entity Current Reporting Status
EntityCurrentReportingStatus
|
Yes | |
| CY2017 | dei |
Entity Filer Category
EntityFilerCategory
|
Large Accelerated Filer | |
| CY2017Q2 | dei |
Entity Public Float
EntityPublicFloat
|
47900000000 | USD |
| CY2017 | dei |
Entity Registrant Name
EntityRegistrantName
|
SOUTHERN CO | |
| CY2017 | dei |
Entity Voluntary Filers
EntityVoluntaryFilers
|
No | |
| CY2017 | dei |
Entity Well Known Seasoned Issuer
EntityWellKnownSeasonedIssuer
|
Yes | |
| CY2017Q4 | invest |
Derivative Notional Amount
DerivativeNotionalAmount
|
3650000000 | USD |
| CY2016Q4 | so |
Accumulated Deferred Tax Assets
AccumulatedDeferredTaxAssets
|
52000000 | USD |
| CY2017Q4 | so |
Accumulated Deferred Tax Assets
AccumulatedDeferredTaxAssets
|
106000000 | USD |
| CY2016Q4 | so |
Accumulated Deferred Tax Liabilities
AccumulatedDeferredTaxLiabilities
|
14092000000 | USD |
| CY2017Q4 | so |
Accumulated Deferred Tax Liabilities
AccumulatedDeferredTaxLiabilities
|
6842000000 | USD |
| CY2016Q4 | so |
Acquisitions Payable
AcquisitionsPayable
|
489000000 | USD |
| CY2017Q4 | so |
Acquisitions Payable
AcquisitionsPayable
|
5000000 | USD |
| CY2015 | so |
Afudc Equity
AfudcEquity
|
0.022 | |
| CY2016 | so |
Afudc Equity
AfudcEquity
|
0.020 | |
| CY2017 | so |
Afudc Equity
AfudcEquity
|
0.026 | |
| CY2017 | so |
Aggregate Payment For Claims Resulting From Terrorist Acts In One Year Period
AggregatePaymentForClaimsResultingFromTerroristActsInOneYearPeriod
|
3200000000 | USD |
| CY2015 | so |
Allowance For Funds Used During Construction And Interest Capitalized Net Of Income Taxes
AllowanceForFundsUsedDuringConstructionAndInterestCapitalizedNetOfIncomeTaxes
|
0.128 | |
| CY2016 | so |
Allowance For Funds Used During Construction And Interest Capitalized Net Of Income Taxes
AllowanceForFundsUsedDuringConstructionAndInterestCapitalizedNetOfIncomeTaxes
|
0.114 | |
| CY2017 | so |
Allowance For Funds Used During Construction And Interest Capitalized Net Of Income Taxes
AllowanceForFundsUsedDuringConstructionAndInterestCapitalizedNetOfIncomeTaxes
|
0.255 | |
| CY2015 | so |
Amortization Of Deferred Investment Tax Credits
AmortizationOfDeferredInvestmentTaxCredits
|
21000000 | USD |
| CY2016 | so |
Amortization Of Deferred Investment Tax Credits
AmortizationOfDeferredInvestmentTaxCredits
|
22000000 | USD |
| CY2017 | so |
Amortization Of Deferred Investment Tax Credits
AmortizationOfDeferredInvestmentTaxCredits
|
22000000 | USD |
| CY2016Q4 | so |
Amount Of Variable Rate Pollution Control Revenue Bonds Outstanding Requiring Liquidity Support
AmountOfVariableRatePollutionControlRevenueBondsOutstandingRequiringLiquiditySupport
|
1900000000 | USD |
| CY2017Q4 | so |
Amount Of Variable Rate Pollution Control Revenue Bonds Outstanding Requiring Liquidity Support
AmountOfVariableRatePollutionControlRevenueBondsOutstandingRequiringLiquiditySupport
|
1500000000 | USD |
| CY2017Q4 | so |
Annual Dividend Preferred And Preference Stock
AnnualDividendPreferredAndPreferenceStock
|
0 | USD |
| CY2017 | so |
Annual Increase Or Decrease In Assumed Medical Care Cost Trend Rate
AnnualIncreaseOrDecreaseInAssumedMedicalCareCostTrendRate
|
0.01 | |
| CY2017Q4 | so |
Annualized Interest Long Term Debt
AnnualizedInterestLongTermDebt
|
1800000000 | USD |
| CY2017Q4 | so |
Bank Credit Arrangements No Term Loan Due With In One Year
BankCreditArrangementsNoTermLoanDueWithInOneYear
|
155000000 | USD |
| CY2017Q4 | so |
Bank Credit Arrangements Term Loan Due With In One Year
BankCreditArrangementsTermLoanDueWithInOneYear
|
40000000 | USD |
| CY2017 | so |
Block Period Considered For Inflation Adjustment Against Maximum Assessment Per Reactor
BlockPeriodConsideredForInflationAdjustmentAgainstMaximumAssessmentPerReactor
|
P5Y | |
| CY2016Q4 | so |
Capitalization In Percent
CapitalizationInPercent
|
1 | |
| CY2017Q4 | so |
Capitalization In Percent
CapitalizationInPercent
|
1 | |
| CY2015 | so |
Change In Construction Payables
ChangeInConstructionPayables
|
402000000 | USD |
| CY2016 | so |
Change In Construction Payables
ChangeInConstructionPayables
|
-121000000 | USD |
| CY2017 | so |
Change In Construction Payables
ChangeInConstructionPayables
|
259000000 | USD |
| CY2016Q4 | so |
Common Stock Feesand Commissions
CommonStockFeesandCommissions
|
1100000 | USD |
| CY2016Q4 | so |
Common Stockholders Equity In Percent Of Capitalization
CommonStockholdersEquityInPercentOfCapitalization
|
0.356 | |
| CY2017Q4 | so |
Common Stockholders Equity In Percent Of Capitalization
CommonStockholdersEquityInPercentOfCapitalization
|
0.344 | |
| CY2015 | so |
Cost Of Natural Gas
CostOfNaturalGas
|
0 | USD |
| CY2016 | so |
Cost Of Natural Gas
CostOfNaturalGas
|
613000000 | USD |
| CY2017 | so |
Cost Of Natural Gas
CostOfNaturalGas
|
1601000000 | USD |
| CY2015 | us-gaap |
Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends
EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends
|
-0.012 | |
| CY2016Q4 | so |
Deferred Charges And Other Assets
DeferredChargesAndOtherAssets
|
10109000000 | USD |
| CY2017Q4 | so |
Deferred Charges And Other Assets
DeferredChargesAndOtherAssets
|
9551000000 | USD |
| CY2016Q4 | so |
Deferred Charges Related To Income Taxes
DeferredChargesRelatedToIncomeTaxes
|
1629000000 | USD |
| CY2017Q4 | so |
Deferred Charges Related To Income Taxes
DeferredChargesRelatedToIncomeTaxes
|
825000000 | USD |
| CY2016Q4 | so |
Deferred Credits Related To Income Taxes
DeferredCreditsRelatedToIncomeTaxes
|
219000000 | USD |
| CY2017Q4 | so |
Deferred Credits Related To Income Taxes
DeferredCreditsRelatedToIncomeTaxes
|
7256000000 | USD |
| CY2015 | so |
Depreciation And Amortization Excluding Nuclear Fuel
DepreciationAndAmortizationExcludingNuclearFuel
|
2034000000 | USD |
| CY2016 | so |
Depreciation And Amortization Excluding Nuclear Fuel
DepreciationAndAmortizationExcludingNuclearFuel
|
2502000000 | USD |
| CY2017 | so |
Depreciation And Amortization Excluding Nuclear Fuel
DepreciationAndAmortizationExcludingNuclearFuel
|
3010000000 | USD |
| CY2015 | so |
Effective Income Tax Rate Reconciliation Amortization Tax Credits Investment
EffectiveIncomeTaxRateReconciliationAmortizationTaxCreditsInvestment
|
0.005 | |
| CY2016 | so |
Effective Income Tax Rate Reconciliation Amortization Tax Credits Investment
EffectiveIncomeTaxRateReconciliationAmortizationTaxCreditsInvestment
|
0.009 | |
| CY2017 | so |
Effective Income Tax Rate Reconciliation Amortization Tax Credits Investment
EffectiveIncomeTaxRateReconciliationAmortizationTaxCreditsInvestment
|
0.042 | |
| CY2015 | so |
Effective Income Tax Rate Reconciliation Tax Credit Production Percent
EffectiveIncomeTaxRateReconciliationTaxCreditProductionPercent
|
0.000 | |
| CY2016 | so |
Effective Income Tax Rate Reconciliation Tax Credit Production Percent
EffectiveIncomeTaxRateReconciliationTaxCreditProductionPercent
|
0.012 | |
| CY2017 | so |
Effective Income Tax Rate Reconciliation Tax Credit Production Percent
EffectiveIncomeTaxRateReconciliationTaxCreditProductionPercent
|
0.121 | |
| CY2016Q4 | so |
Electric Utility Plantin Service
ElectricUtilityPlantinService
|
83165000000 | USD |
| CY2017Q4 | so |
Electric Utility Plantin Service
ElectricUtilityPlantinService
|
86482000000 | USD |
| CY2015 | so |
Estimated Loss On Integrated Coal Gasification Combined Cycle Project
EstimatedLossOnIntegratedCoalGasificationCombinedCycleProject
|
365000000 | USD |
| CY2016 | so |
Estimated Loss On Integrated Coal Gasification Combined Cycle Project
EstimatedLossOnIntegratedCoalGasificationCombinedCycleProject
|
428000000 | USD |
| CY2017 | so |
Estimated Loss On Integrated Coal Gasification Combined Cycle Project
EstimatedLossOnIntegratedCoalGasificationCombinedCycleProject
|
3362000000 | USD |
| CY2015 | so |
Estimated Loss On Integrated Coal Gasification Combined Cycle Project Non Cash
EstimatedLossOnIntegratedCoalGasificationCombinedCycleProjectNonCash
|
365000000 | USD |
| CY2016 | so |
Estimated Loss On Integrated Coal Gasification Combined Cycle Project Non Cash
EstimatedLossOnIntegratedCoalGasificationCombinedCycleProjectNonCash
|
428000000 | USD |
| CY2017 | so |
Estimated Loss On Integrated Coal Gasification Combined Cycle Project Non Cash
EstimatedLossOnIntegratedCoalGasificationCombinedCycleProjectNonCash
|
3179000000 | USD |
| CY2017Q4 | so |
Executable Term Loans For One Year
ExecutableTermLoansForOneYear
|
65000000 | USD |
| CY2017Q4 | so |
Executable Term Loans For Two Years
ExecutableTermLoansForTwoYears
|
0 | USD |
| CY2017 | so |
Expected Volume Of Natural Gas Subject To Option To Sell Back Excess Gas Due To Operational Constraints
ExpectedVolumeOfNaturalGasSubjectToOptionToSellBackExcessGasDueToOperationalConstraints
|
32000000 | MMBTU |
| CY2015 | so |
Expense Under Purchase Power Agreements Accounted For As Operating Leases
ExpenseUnderPurchasePowerAgreementsAccountedForAsOperatingLeases
|
227000000 | USD |
| CY2016 | so |
Expense Under Purchase Power Agreements Accounted For As Operating Leases
ExpenseUnderPurchasePowerAgreementsAccountedForAsOperatingLeases
|
232000000 | USD |
| CY2017 | so |
Expense Under Purchase Power Agreements Accounted For As Operating Leases
ExpenseUnderPurchasePowerAgreementsAccountedForAsOperatingLeases
|
235000000 | USD |
| CY2017Q4 | so |
Fair Value Gain Loss
FairValueGainLoss
|
-36000000 | USD |
| CY2016 | so |
Gas Revenue
GasRevenue
|
1652000000 | USD |
| CY2017 | so |
Gas Revenue
GasRevenue
|
3920000000 | USD |
| CY2015 | so |
Hedge Settlements
HedgeSettlements
|
17000000 | USD |
| CY2016 | so |
Hedge Settlements
HedgeSettlements
|
233000000 | USD |
| CY2017 | so |
Hedge Settlements
HedgeSettlements
|
-6000000 | USD |
| CY2015 | so |
Increase Decrease In Accrued Taxes
IncreaseDecreaseInAccruedTaxes
|
352000000 | USD |
| CY2016 | so |
Increase Decrease In Accrued Taxes
IncreaseDecreaseInAccruedTaxes
|
1456000000 | USD |
| CY2017 | so |
Increase Decrease In Accrued Taxes
IncreaseDecreaseInAccruedTaxes
|
-142000000 | USD |
| CY2015 | so |
Increase Decrease Retail Fuel Cost Over Recovery Short Term
IncreaseDecreaseRetailFuelCostOverRecoveryShortTerm
|
-289000000 | USD |
| CY2016 | so |
Increase Decrease Retail Fuel Cost Over Recovery Short Term
IncreaseDecreaseRetailFuelCostOverRecoveryShortTerm
|
231000000 | USD |
| CY2017 | so |
Increase Decrease Retail Fuel Cost Over Recovery Short Term
IncreaseDecreaseRetailFuelCostOverRecoveryShortTerm
|
212000000 | USD |
| CY2015 | so |
Increase Decreasein Energy Related Inventory Natural Gasin Storage
IncreaseDecreaseinEnergyRelatedInventoryNaturalGasinStorage
|
0 | USD |
| CY2016 | so |
Increase Decreasein Energy Related Inventory Natural Gasin Storage
IncreaseDecreaseinEnergyRelatedInventoryNaturalGasinStorage
|
226000000 | USD |
| CY2017 | so |
Increase Decreasein Energy Related Inventory Natural Gasin Storage
IncreaseDecreaseinEnergyRelatedInventoryNaturalGasinStorage
|
-36000000 | USD |
| CY2015 | so |
Increase Decreasein Fair Valueof Securities Relatedto Nuclear Decommissioning
IncreaseDecreaseinFairValueofSecuritiesRelatedtoNuclearDecommissioning
|
11000000 | USD |
| CY2016 | so |
Increase Decreasein Fair Valueof Securities Relatedto Nuclear Decommissioning
IncreaseDecreaseinFairValueofSecuritiesRelatedtoNuclearDecommissioning
|
114000000 | USD |
| CY2017 | so |
Increase Decreasein Fair Valueof Securities Relatedto Nuclear Decommissioning
IncreaseDecreaseinFairValueofSecuritiesRelatedtoNuclearDecommissioning
|
233000000 | USD |
| CY2017Q4 | so |
Line Of Credit Expire Year One
LineOfCreditExpireYearOne
|
195000000 | USD |
| CY2017Q4 | so |
Line Of Credit Expire Year Three
LineOfCreditExpireYearThree
|
725000000 | USD |
| CY2017Q4 | so |
Line Of Credit Expire Year Two
LineOfCreditExpireYearTwo
|
25000000 | USD |
| CY2017Q4 | so |
Lineof Credit Expire Year Five
LineofCreditExpireYearFive
|
7200000000 | USD |
| CY2017Q2 | so |
Lineof Credit Terminated
LineofCreditTerminated
|
1000000000 | USD |
| CY2017Q4 | so |
Long Term Debt And Capital Lease Obligation Maturities Re Payments In Next Twelve Months
LongTermDebtAndCapitalLeaseObligationMaturitiesRePaymentsInNextTwelveMonths
|
3900000000 | USD |
| CY2016Q4 | so |
Long Term Debt And Capital Lease Obligation Net
LongTermDebtAndCapitalLeaseObligationNet
|
45216000000 | USD |
| CY2017Q4 | so |
Long Term Debt And Capital Lease Obligation Net
LongTermDebtAndCapitalLeaseObligationNet
|
48354000000 | USD |
| CY2016Q4 | so |
Long Term Debt And Capital Lease Obligations In Percent Of Capitalization
LongTermDebtAndCapitalLeaseObligationsInPercentOfCapitalization
|
0.613 | |
| CY2017Q4 | so |
Long Term Debt And Capital Lease Obligations In Percent Of Capitalization
LongTermDebtAndCapitalLeaseObligationsInPercentOfCapitalization
|
0.632 | |
| CY2016Q4 | so |
Long Term Debt Maturities Repayments Of Principal In Last Twelve Months
LongTermDebtMaturitiesRepaymentsOfPrincipalInLastTwelveMonths
|
2019000000 | USD |
| CY2017Q4 | so |
Long Term Debt Maturities Repayments Of Principal In Last Twelve Months
LongTermDebtMaturitiesRepaymentsOfPrincipalInLastTwelveMonths
|
0 | USD |
| CY2017Q4 | so |
Long Term Debtand Capital Lease Obligation Maturities Repaymentsin Year Five
LongTermDebtandCapitalLeaseObligationMaturitiesRepaymentsinYearFive
|
2200000000 | USD |
| CY2017Q4 | so |
Long Term Debtand Capital Lease Obligation Maturities Repaymentsin Year Four
LongTermDebtandCapitalLeaseObligationMaturitiesRepaymentsinYearFour
|
3100000000 | USD |
| CY2017Q4 | so |
Long Term Debtand Capital Lease Obligation Maturities Repaymentsin Year Three
LongTermDebtandCapitalLeaseObligationMaturitiesRepaymentsinYearThree
|
3200000000 | USD |
| CY2017Q4 | so |
Long Term Debtand Capital Lease Obligation Maturities Repaymentsin Year Two
LongTermDebtandCapitalLeaseObligationMaturitiesRepaymentsinYearTwo
|
3200000000 | USD |
| CY2016Q4 | so |
Long Term Senior Notes And Debt
LongTermSeniorNotesAndDebt
|
35247000000 | USD |
| CY2017Q4 | so |
Long Term Senior Notes And Debt
LongTermSeniorNotesAndDebt
|
36820000000 | USD |
| CY2017 | so |
Maximum Aggregate Amount For Each Incident
MaximumAggregateAmountForEachIncident
|
19000000 | USD |
| CY2017 | so |
Maximum Amount For Each Licensed Reactor
MaximumAmountForEachLicensedReactor
|
127000000 | USD |
| CY2017 | so |
Maximum Coverage Per Occurrence Per Unit Limit To Obtain Replacement Power
MaximumCoveragePerOccurrencePerUnitLimitToObtainReplacementPower
|
490000000 | USD |
| CY2017 | so |
Maximum Deductible Waiting Period
MaximumDeductibleWaitingPeriod
|
26 weeks | |
| CY2017 | so |
Maximum Fund Provided For Public Liability Claims
MaximumFundProvidedForPublicLiabilityClaims
|
13400000000 | USD |
| CY2017 | so |
Maximum Insurance Coverage
MaximumInsuranceCoverage
|
450000000 | USD |
| CY2017 | so |
Maximum Percentage Of Transfer Performance Shares To Common Stock Based On Actual Shareholder Return
MaximumPercentageOfTransferPerformanceSharesToCommonStockBasedOnActualShareholderReturn
|
2 | |
| CY2017 | so |
Minimum Percentage Of Transfer Performance Shares To Common Stock Based On Actual Shareholder Return
MinimumPercentageOfTransferPerformanceSharesToCommonStockBasedOnActualShareholderReturn
|
0 | |
| CY2016Q4 | so |
Minority Interest In Percent Of Capitalization
MinorityInterestInPercentOfCapitalization
|
0.027 | |
| CY2017Q4 | so |
Minority Interest In Percent Of Capitalization
MinorityInterestInPercentOfCapitalization
|
0.019 | |
| CY2015 | so |
Mirror Construction Work In Progress
MirrorConstructionWorkInProgress
|
-271000000 | USD |
| CY2016 | so |
Mirror Construction Work In Progress
MirrorConstructionWorkInProgress
|
0 | USD |
| CY2017 | so |
Mirror Construction Work In Progress
MirrorConstructionWorkInProgress
|
0 | USD |
| CY2015 | so |
Natural Gas Revenues
NaturalGasRevenues
|
0 | USD |
| CY2016 | so |
Natural Gas Revenues
NaturalGasRevenues
|
1596000000 | USD |
| CY2017 | so |
Natural Gas Revenues
NaturalGasRevenues
|
3791000000 | USD |
| CY2017 | so |
Noncontrolling Interest Decreasefrom Reclassificationto Temporary Equity
NoncontrollingInterestDecreasefromReclassificationtoTemporaryEquity
|
-114000000 | USD |
| CY2015 | so |
Noncontrolling Interest Increasefrom Contributionsfrom Noncontrolling Interest Holders
NoncontrollingInterestIncreasefromContributionsfromNoncontrollingInterestHolders
|
567000000 | USD |
| CY2016 | so |
Noncontrolling Interest Increasefrom Contributionsfrom Noncontrolling Interest Holders
NoncontrollingInterestIncreasefromContributionsfromNoncontrollingInterestHolders
|
618000000 | USD |
| CY2017 | so |
Noncontrolling Interest Increasefrom Contributionsfrom Noncontrolling Interest Holders
NoncontrollingInterestIncreasefromContributionsfromNoncontrollingInterestHolders
|
79000000 | USD |
| CY2016Q4 | so |
Nuclear Fuel At Amortized Cost
NuclearFuelAtAmortizedCost
|
905000000 | USD |
| CY2017Q4 | so |
Nuclear Fuel At Amortized Cost
NuclearFuelAtAmortizedCost
|
883000000 | USD |
| CY2017Q4 | so |
Number Of Employees Participatingin Restricted Stock Unitand Performance Share Units Program
NumberOfEmployeesParticipatinginRestrictedStockUnitandPerformanceShareUnitsProgram
|
327 | Employee |
| CY2017Q4 | so |
Number Of Employees Participatingin Stock Optionand Performance Share Units Program
NumberOfEmployeesParticipatinginStockOptionandPerformanceShareUnitsProgram
|
5112 | Employee |
| CY2017Q4 | so |
Number Of Traditional Operating Companies
NumberOfTraditionalOperatingCompanies
|
4 | segment |
| CY2017Q4 | so |
Numberof Performance Goals
NumberofPerformanceGoals
|
3 | goal |
| CY2017 | so |
Original Maturitiesof Temporary Cash Investments
OriginalMaturitiesofTemporaryCashInvestments
|
P90D | |
| CY2016Q4 | so |
Other Accounts Notes And Loans Receivable
OtherAccountsNotesAndLoansReceivable
|
377000000 | USD |
| CY2017Q4 | so |
Other Accounts Notes And Loans Receivable
OtherAccountsNotesAndLoansReceivable
|
635000000 | USD |
| CY2016Q4 | so |
Other Cost Of Removal Obligations
OtherCostOfRemovalObligations
|
2748000000 | USD |
| CY2017Q4 | so |
Other Cost Of Removal Obligations
OtherCostOfRemovalObligations
|
2684000000 | USD |
| CY2015 | so |
Other Electric Revenues
OtherElectricRevenues
|
657000000 | USD |
| CY2016 | so |
Other Electric Revenues
OtherElectricRevenues
|
698000000 | USD |
| CY2017 | so |
Other Electric Revenues
OtherElectricRevenues
|
681000000 | USD |
| CY2016Q4 | so |
Other Regulatory Assets Current
OtherRegulatoryAssetsCurrent
|
581000000 | USD |
| CY2017Q4 | so |
Other Regulatory Assets Current
OtherRegulatoryAssetsCurrent
|
604000000 | USD |
| CY2016Q4 | so |
Other Regulatory Assets Deferred
OtherRegulatoryAssetsDeferred
|
6851000000 | USD |
| CY2017Q4 | so |
Other Regulatory Assets Deferred
OtherRegulatoryAssetsDeferred
|
6943000000 | USD |
| CY2016Q4 | so |
Other Regulatory Liabilities Current
OtherRegulatoryLiabilitiesCurrent
|
236000000 | USD |
| CY2017Q4 | so |
Other Regulatory Liabilities Current
OtherRegulatoryLiabilitiesCurrent
|
337000000 | USD |
| CY2016Q4 | so |
Other Regulatory Liabilities Deferred
OtherRegulatoryLiabilitiesDeferred
|
258000000 | USD |
| CY2017Q4 | so |
Other Regulatory Liabilities Deferred
OtherRegulatoryLiabilitiesDeferred
|
239000000 | USD |
| CY2015 | so |
Payments For Investment In Restricted Cash
PaymentsForInvestmentInRestrictedCash
|
160000000 | USD |
| CY2016 | so |
Payments For Investment In Restricted Cash
PaymentsForInvestmentInRestrictedCash
|
733000000 | USD |
| CY2017 | so |
Payments For Investment In Restricted Cash
PaymentsForInvestmentInRestrictedCash
|
17000000 | USD |
| CY2017 | so |
Period Over Which Company Has Elected To Amortize Changes In Market Value Of All Plan Assets
PeriodOverWhichCompanyHasElectedToAmortizeChangesInMarketValueOfAllPlanAssets
|
P5Y | |
| CY2016Q4 | so |
Plant In Service Net Of Depreciation
PlantInServiceNetOfDepreciation
|
68564000000 | USD |
| CY2017Q4 | so |
Plant In Service Net Of Depreciation
PlantInServiceNetOfDepreciation
|
72085000000 | USD |
| CY2015 | so |
Prepaid Long Term Service Agreement
PrepaidLongTermServiceAgreement
|
197000000 | USD |
| CY2016 | so |
Prepaid Long Term Service Agreement
PrepaidLongTermServiceAgreement
|
134000000 | USD |
| CY2017 | so |
Prepaid Long Term Service Agreement
PrepaidLongTermServiceAgreement
|
227000000 | USD |
| CY2015 | so |
Proceeds From Distribution Of Restricted Cash
ProceedsFromDistributionOfRestrictedCash
|
154000000 | USD |
| CY2016 | so |
Proceeds From Distribution Of Restricted Cash
ProceedsFromDistributionOfRestrictedCash
|
742000000 | USD |
| CY2017 | so |
Proceeds From Distribution Of Restricted Cash
ProceedsFromDistributionOfRestrictedCash
|
34000000 | USD |
| CY2015 | so |
Proceeds From Guarantee Obligation
ProceedsFromGuaranteeObligation
|
0 | USD |
| CY2016 | so |
Proceeds From Guarantee Obligation
ProceedsFromGuaranteeObligation
|
0 | USD |
| CY2017 | so |
Proceeds From Guarantee Obligation
ProceedsFromGuaranteeObligation
|
1682000000 | USD |
| CY2015 | so |
Proceeds From Sale Of Securities Held In External Trust Funds
ProceedsFromSaleOfSecuritiesHeldInExternalTrustFunds
|
1400000000 | USD |
| CY2016 | so |
Proceeds From Sale Of Securities Held In External Trust Funds
ProceedsFromSaleOfSecuritiesHeldInExternalTrustFunds
|
1200000000 | USD |
| CY2017 | so |
Proceeds From Sale Of Securities Held In External Trust Funds
ProceedsFromSaleOfSecuritiesHeldInExternalTrustFunds
|
800000000 | USD |
| CY2016Q4 | so |
Public Utilities Property Plant And Equipment Communications Equipment
PublicUtilitiesPropertyPlantAndEquipmentCommunicationsEquipment
|
424000000 | USD |
| CY2017Q4 | so |
Public Utilities Property Plant And Equipment Communications Equipment
PublicUtilitiesPropertyPlantAndEquipmentCommunicationsEquipment
|
456000000 | USD |
| CY2016Q4 | so |
Public Utilities Property Plant And Equipment It Equipment And Software
PublicUtilitiesPropertyPlantAndEquipmentItEquipmentAndSoftware
|
544000000 | USD |
| CY2017Q4 | so |
Public Utilities Property Plant And Equipment It Equipment And Software
PublicUtilitiesPropertyPlantAndEquipmentItEquipmentAndSoftware
|
752000000 | USD |
| CY2016Q4 | so |
Public Utilities Property Plant And Equipment Other
PublicUtilitiesPropertyPlantAndEquipmentOther
|
824000000 | USD |
| CY2017Q4 | so |
Public Utilities Property Plant And Equipment Other
PublicUtilitiesPropertyPlantAndEquipmentOther
|
1176000000 | USD |
| CY2016Q4 | so |
Public Utilities Property Plantand Equipment General
PublicUtilitiesPropertyPlantandEquipmentGeneral
|
4629000000 | USD |
| CY2017Q4 | so |
Public Utilities Property Plantand Equipment General
PublicUtilitiesPropertyPlantandEquipmentGeneral
|
4276000000 | USD |
| CY2016Q4 | so |
Public Utilities Property Plantand Equipment Storage Facilities
PublicUtilitiesPropertyPlantandEquipmentStorageFacilities
|
1463000000 | USD |
| CY2016Q4 | so |
Public Utilities Property Plantand Equipment Transportationand Distribution
PublicUtilitiesPropertyPlantandEquipmentTransportationandDistribution
|
11996000000 | USD |
| CY2017Q4 | so |
Public Utilities Property Plantand Equipment Storage Facilities
PublicUtilitiesPropertyPlantandEquipmentStorageFacilities
|
1598000000 | USD |
| CY2017Q4 | so |
Public Utilities Property Plantand Equipment Transportationand Distribution
PublicUtilitiesPropertyPlantandEquipmentTransportationandDistribution
|
13078000000 | USD |
| CY2015 | so |
Purchaseof Membership Interestsfrom Noncontrolling Interests
PurchaseofMembershipInterestsfromNoncontrollingInterests
|
0 | USD |
| CY2016 | so |
Purchaseof Membership Interestsfrom Noncontrolling Interests
PurchaseofMembershipInterestsfromNoncontrollingInterests
|
0 | USD |
| CY2017 | so |
Purchaseof Membership Interestsfrom Noncontrolling Interests
PurchaseofMembershipInterestsfromNoncontrollingInterests
|
0 | USD |
| CY2017Q4 | so |
Ratio Of Indebtedness To Capitalization Covenant
RatioOfIndebtednessToCapitalizationCovenant
|
0.7 | |
| CY2015Q3 | so |
Ratio Of Indebtedness To Capitalization Covenant
RatioOfIndebtednessToCapitalizationCovenant
|
0.65 | |
| CY2016Q4 | so |
Redeemable Noncontrolling Interest As Percent Of Capitalization
RedeemableNoncontrollingInterestAsPercentOfCapitalization
|
0.002 | |
| CY2017Q4 | so |
Redeemable Noncontrolling Interest As Percent Of Capitalization
RedeemableNoncontrollingInterestAsPercentOfCapitalization
|
0.000 | |
| CY2016Q4 | so |
Regulatory Hedge Unrealized Gain
RegulatoryHedgeUnrealizedGain
|
68000000 | USD |
| CY2017Q4 | so |
Regulatory Hedge Unrealized Gain
RegulatoryHedgeUnrealizedGain
|
8000000 | USD |
| CY2016Q4 | so |
Regulatory Hedge Unrealized Loss
RegulatoryHedgeUnrealizedLoss
|
35000000 | USD |
| CY2017Q4 | so |
Regulatory Hedge Unrealized Loss
RegulatoryHedgeUnrealizedLoss
|
52000000 | USD |
| CY2017 | so |
Remarketed Pollution Control Bonds
RemarketedPollutionControlBonds
|
714000000 | USD |
| CY2015 | so |
Repayment Of Interestbearing Refundable Deposit Related To Asset Sale
RepaymentOfInterestbearingRefundableDepositRelatedToAssetSale
|
275000000 | USD |
| CY2016 | so |
Repayment Of Interestbearing Refundable Deposit Related To Asset Sale
RepaymentOfInterestbearingRefundableDepositRelatedToAssetSale
|
0 | USD |
| CY2017 | so |
Repayment Of Interestbearing Refundable Deposit Related To Asset Sale
RepaymentOfInterestbearingRefundableDepositRelatedToAssetSale
|
0 | USD |
| CY2016Q4 | so |
Required Collateral Credit Rating Downgrade
RequiredCollateralCreditRatingDowngrade
|
0 | USD |
| CY2017Q4 | so |
Required Collateral Credit Rating Downgrade
RequiredCollateralCreditRatingDowngrade
|
8000000 | USD |
| CY2015 | so |
Retail Revenues
RetailRevenues
|
14987000000 | USD |
| CY2016 | so |
Retail Revenues
RetailRevenues
|
15234000000 | USD |
| CY2017 | so |
Retail Revenues
RetailRevenues
|
15330000000 | USD |
| CY2016Q4 | so |
Revenue Bonds
RevenueBonds
|
76000000 | USD |
| CY2017Q4 | so |
Revenue Bonds
RevenueBonds
|
90000000 | USD |
| CY2017 | so |
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Reserved For Issuance Pursuant To Stock Based Compensation Plan
ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesReservedForIssuancePursuantToStockBasedCompensationPlan
|
71000000 | shares |
| CY2017 | so |
Share Based Compensation Shares Vestedand Issued Each Year Employee Remains In Service At Each Vest Year Percentage
ShareBasedCompensationSharesVestedandIssuedEachYearEmployeeRemainsInServiceAtEachVestYearPercentage
|
0.33 | |
| CY2016Q4 | so |
Short Term Borrowings Excluding Other Energy Service Contracts
ShortTermBorrowingsExcludingOtherEnergyServiceContracts
|
2032000000 | USD |
| CY2017Q4 | so |
Short Term Borrowings Excluding Other Energy Service Contracts
ShortTermBorrowingsExcludingOtherEnergyServiceContracts
|
2439000000 | USD |
| CY2017 | so |
Significantly Increase Or Decrease In Amount Of Unrecognized Tax Benefits
SignificantlyIncreaseOrDecreaseInAmountOfUnrecognizedTaxBenefits
|
P12M | |
| CY2017 | so |
State Investment Tax Credit
StateInvestmentTaxCredit
|
318000000 | USD |
| CY2017 | so |
Stock Issued During Period Shares Company Investment Plan And Employee And Director Stock Plans
StockIssuedDuringPeriodSharesCompanyInvestmentPlanAndEmployeeAndDirectorStockPlans
|
14600000 | shares |
| CY2017Q1 | so |
Storm Restoration Costs
StormRestorationCosts
|
9000000 | USD |
| CY2017Q4 | so |
Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit
TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit
|
264000000 | USD |
| CY2016Q4 | so |
Tax Cutsand Jobs Actof2017 Changein Tax Rate Deferred Tax Asset Regulatory Liability
TaxCutsandJobsActof2017ChangeinTaxRateDeferredTaxAssetRegulatoryLiability
|
0 | USD |
| CY2017Q4 | so |
Tax Cutsand Jobs Actof2017 Changein Tax Rate Deferred Tax Asset Regulatory Liability
TaxCutsandJobsActof2017ChangeinTaxRateDeferredTaxAssetRegulatoryLiability
|
465000000 | USD |
| CY2015Q4 | so |
Tax Positions Not Impacting Effective Tax Rate
TaxPositionsNotImpactingEffectiveTaxRate
|
423000000 | USD |
| CY2016Q4 | so |
Tax Positions Not Impacting Effective Tax Rate
TaxPositionsNotImpactingEffectiveTaxRate
|
464000000 | USD |
| CY2017Q4 | so |
Tax Positions Not Impacting Effective Tax Rate
TaxPositionsNotImpactingEffectiveTaxRate
|
0 | USD |
| CY2016Q4 | so |
Temporary Equity Carrying Amount In Percent Of Capitalization
TemporaryEquityCarryingAmountInPercentOfCapitalization
|
0.002 | |
| CY2017Q4 | so |
Temporary Equity Carrying Amount In Percent Of Capitalization
TemporaryEquityCarryingAmountInPercentOfCapitalization
|
0.005 | |
| CY2016Q1 | so |
Trading Price Range Per Common Share High
TradingPriceRangePerCommonShareHigh
|
51.73 | |
| CY2016Q2 | so |
Trading Price Range Per Common Share High
TradingPriceRangePerCommonShareHigh
|
53.64 | |
| CY2016Q3 | so |
Trading Price Range Per Common Share High
TradingPriceRangePerCommonShareHigh
|
54.64 | |
| CY2016Q4 | so |
Trading Price Range Per Common Share High
TradingPriceRangePerCommonShareHigh
|
52.23 | |
| CY2017Q1 | so |
Trading Price Range Per Common Share High
TradingPriceRangePerCommonShareHigh
|
51.47 | |
| CY2017Q2 | so |
Trading Price Range Per Common Share High
TradingPriceRangePerCommonShareHigh
|
51.97 | |
| CY2017Q3 | so |
Trading Price Range Per Common Share High
TradingPriceRangePerCommonShareHigh
|
50.80 | |
| CY2017Q4 | so |
Trading Price Range Per Common Share High
TradingPriceRangePerCommonShareHigh
|
53.51 | |
| CY2016Q1 | so |
Trading Price Range Per Common Share Low
TradingPriceRangePerCommonShareLow
|
46 | |
| CY2016Q2 | so |
Trading Price Range Per Common Share Low
TradingPriceRangePerCommonShareLow
|
47.62 | |
| CY2016Q3 | so |
Trading Price Range Per Common Share Low
TradingPriceRangePerCommonShareLow
|
50 | |
| CY2016Q4 | so |
Trading Price Range Per Common Share Low
TradingPriceRangePerCommonShareLow
|
46.20 | |
| CY2017Q1 | so |
Trading Price Range Per Common Share Low
TradingPriceRangePerCommonShareLow
|
47.57 | |
| CY2017Q2 | so |
Trading Price Range Per Common Share Low
TradingPriceRangePerCommonShareLow
|
47.87 | |
| CY2017Q3 | so |
Trading Price Range Per Common Share Low
TradingPriceRangePerCommonShareLow
|
46.71 | |
| CY2017Q4 | so |
Trading Price Range Per Common Share Low
TradingPriceRangePerCommonShareLow
|
47.92 | |
| CY2016Q4 | so |
Unamortized Debt Issuance Expense Current
UnamortizedDebtIssuanceExpenseCurrent
|
1000000 | USD |
| CY2017Q4 | so |
Unamortized Debt Issuance Expense Current
UnamortizedDebtIssuanceExpenseCurrent
|
3000000 | USD |
| CY2016Q4 | so |
Unamortized Fair Value Adjustmentof Longterm Debt
UnamortizedFairValueAdjustmentofLongtermDebt
|
578000000 | USD |
| CY2017Q4 | so |
Unamortized Fair Value Adjustmentof Longterm Debt
UnamortizedFairValueAdjustmentofLongtermDebt
|
525000000 | USD |
| CY2016Q4 | so |
Unbilled Revenues Current
UnbilledRevenuesCurrent
|
706000000 | USD |
| CY2017Q4 | so |
Unbilled Revenues Current
UnbilledRevenuesCurrent
|
810000000 | USD |
| CY2016Q4 | so |
Under Recovered Regulatory Clause Revenues
UnderRecoveredRegulatoryClauseRevenues
|
0 | USD |
| CY2017Q4 | so |
Under Recovered Regulatory Clause Revenues
UnderRecoveredRegulatoryClauseRevenues
|
171000000 | USD |
| CY2017 | so |
Undistributed Retained Earnings Of Subsidiaries
UndistributedRetainedEarningsOfSubsidiaries
|
5300000000 | USD |
| CY2016Q4 | so |
Unrecognized Tax Benefits Accrued Taxes
UnrecognizedTaxBenefitsAccruedTaxes
|
385000000 | USD |
| CY2017Q4 | so |
Unrecognized Tax Benefits Accrued Taxes
UnrecognizedTaxBenefitsAccruedTaxes
|
18000000 | USD |
| CY2016Q4 | so |
Utility Plant In Service
UtilityPlantInService
|
95161000000 | USD |
| CY2017Q4 | so |
Utility Plant In Service
UtilityPlantInService
|
99560000000 | USD |
| CY2016Q4 | so |
Weather Derivative Premium
WeatherDerivativePremium
|
4000000 | USD |
| CY2017Q4 | so |
Weather Derivative Premium
WeatherDerivativePremium
|
11000000 | USD |
| CY2015 | so |
Wholesale Revenues
WholesaleRevenues
|
1798000000 | USD |
| CY2016 | so |
Wholesale Revenues
WholesaleRevenues
|
1926000000 | USD |
| CY2017 | so |
Wholesale Revenues
WholesaleRevenues
|
2426000000 | USD |
| CY2016Q4 | us-gaap |
Accounts Payable Current
AccountsPayableCurrent
|
2228000000 | USD |
| CY2017Q4 | us-gaap |
Accounts Payable Current
AccountsPayableCurrent
|
2530000000 | USD |
| CY2016Q4 | us-gaap |
Accounts Receivable Gross Current
AccountsReceivableGrossCurrent
|
1583000000 | USD |
| CY2017Q4 | us-gaap |
Accounts Receivable Gross Current
AccountsReceivableGrossCurrent
|
1806000000 | USD |
| CY2016Q4 | us-gaap |
Accrual For Taxes Other Than Income Taxes Current
AccrualForTaxesOtherThanIncomeTaxesCurrent
|
667000000 | USD |
| CY2017Q4 | us-gaap |
Accrual For Taxes Other Than Income Taxes Current
AccrualForTaxesOtherThanIncomeTaxesCurrent
|
613000000 | USD |
| CY2016Q4 | us-gaap |
Accrued Environmental Loss Contingencies Noncurrent
AccruedEnvironmentalLossContingenciesNoncurrent
|
397000000 | USD |
| CY2017Q4 | us-gaap |
Accrued Environmental Loss Contingencies Noncurrent
AccruedEnvironmentalLossContingenciesNoncurrent
|
389000000 | USD |
| CY2016Q4 | us-gaap |
Accrued Income Taxes Current
AccruedIncomeTaxesCurrent
|
193000000 | USD |
| CY2017Q4 | us-gaap |
Accrued Income Taxes Current
AccruedIncomeTaxesCurrent
|
6000000 | USD |
| CY2016Q4 | us-gaap |
Accrued Salaries Current
AccruedSalariesCurrent
|
915000000 | USD |
| CY2017Q4 | us-gaap |
Accrued Salaries Current
AccruedSalariesCurrent
|
959000000 | USD |
| CY2016Q4 | us-gaap |
Accumulated Deferred Investment Tax Credit
AccumulatedDeferredInvestmentTaxCredit
|
2228000000 | USD |
| CY2017Q4 | us-gaap |
Accumulated Deferred Investment Tax Credit
AccumulatedDeferredInvestmentTaxCredit
|
2267000000 | USD |
| CY2016Q4 | us-gaap |
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
|
29852000000 | USD |
| CY2017Q4 | us-gaap |
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
|
31457000000 | USD |
| CY2015 | us-gaap |
Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value
AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
|
100000000 | USD |
| CY2017Q4 | us-gaap |
Accumulated Other Comprehensive Income Loss Net Of Tax
AccumulatedOtherComprehensiveIncomeLossNetOfTax
|
-189000000 | USD |
| CY2016Q4 | us-gaap |
Accumulated Other Comprehensive Income Loss Net Of Tax
AccumulatedOtherComprehensiveIncomeLossNetOfTax
|
-180000000 | USD |
| CY2016Q4 | us-gaap |
Additional Paid In Capital Common Stock
AdditionalPaidInCapitalCommonStock
|
9661000000 | USD |
| CY2017Q4 | us-gaap |
Additional Paid In Capital Common Stock
AdditionalPaidInCapitalCommonStock
|
10469000000 | USD |
| CY2017Q4 | us-gaap |
Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation
CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
|
72000000 | USD |
| CY2016 | us-gaap |
Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value
AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
|
120000000 | USD |
| CY2017 | us-gaap |
Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value
AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
|
105000000 | USD |
| CY2016Q4 | us-gaap |
Allowance For Doubtful Accounts Receivable Current
AllowanceForDoubtfulAccountsReceivableCurrent
|
43000000 | USD |
| CY2017Q4 | us-gaap |
Allowance For Doubtful Accounts Receivable Current
AllowanceForDoubtfulAccountsReceivableCurrent
|
44000000 | USD |
| CY2015 | us-gaap |
Amortization Of Intangible Assets
AmortizationOfIntangibleAssets
|
3000000 | USD |
| CY2016 | us-gaap |
Amortization Of Intangible Assets
AmortizationOfIntangibleAssets
|
50000000 | USD |
| CY2017 | us-gaap |
Amortization Of Intangible Assets
AmortizationOfIntangibleAssets
|
124000000 | USD |
| CY2015Q4 | us-gaap |
Asset Retirement Obligation
AssetRetirementObligation
|
3759000000 | USD |
| CY2016Q4 | us-gaap |
Asset Retirement Obligation
AssetRetirementObligation
|
4514000000 | USD |
| CY2017Q4 | us-gaap |
Asset Retirement Obligation
AssetRetirementObligation
|
4824000000 | USD |
| CY2016 | us-gaap |
Asset Retirement Obligation Accretion Expense
AssetRetirementObligationAccretionExpense
|
162000000 | USD |
| CY2017 | us-gaap |
Asset Retirement Obligation Accretion Expense
AssetRetirementObligationAccretionExpense
|
179000000 | USD |
| CY2015 | us-gaap |
Asset Retirement Obligation Cash Paid To Settle
AssetRetirementObligationCashPaidToSettle
|
37000000 | USD |
| CY2016 | us-gaap |
Asset Retirement Obligation Cash Paid To Settle
AssetRetirementObligationCashPaidToSettle
|
171000000 | USD |
| CY2017 | us-gaap |
Asset Retirement Obligation Cash Paid To Settle
AssetRetirementObligationCashPaidToSettle
|
177000000 | USD |
| CY2016Q4 | us-gaap |
Asset Retirement Obligation Current
AssetRetirementObligationCurrent
|
378000000 | USD |
| CY2017Q4 | us-gaap |
Asset Retirement Obligation Current
AssetRetirementObligationCurrent
|
351000000 | USD |
| CY2016 | us-gaap |
Asset Retirement Obligation Liabilities Incurred
AssetRetirementObligationLiabilitiesIncurred
|
66000000 | USD |
| CY2017 | us-gaap |
Asset Retirement Obligation Liabilities Incurred
AssetRetirementObligationLiabilitiesIncurred
|
16000000 | USD |
| CY2016 | us-gaap |
Asset Retirement Obligation Liabilities Settled
AssetRetirementObligationLiabilitiesSettled
|
171000000 | USD |
| CY2017 | us-gaap |
Asset Retirement Obligation Liabilities Settled
AssetRetirementObligationLiabilitiesSettled
|
177000000 | USD |
| CY2016 | us-gaap |
Asset Retirement Obligation Revision Of Estimate
AssetRetirementObligationRevisionOfEstimate
|
698000000 | USD |
| CY2017 | us-gaap |
Asset Retirement Obligation Revision Of Estimate
AssetRetirementObligationRevisionOfEstimate
|
292000000 | USD |
| CY2016Q4 | us-gaap |
Asset Retirement Obligations Noncurrent
AssetRetirementObligationsNoncurrent
|
4136000000 | USD |
| CY2017Q4 | us-gaap |
Asset Retirement Obligations Noncurrent
AssetRetirementObligationsNoncurrent
|
4473000000 | USD |
| CY2015Q4 | us-gaap |
Assets
Assets
|
78318000000 | USD |
| CY2016Q4 | us-gaap |
Assets
Assets
|
109697000000 | USD |
| CY2017Q4 | us-gaap |
Assets
Assets
|
111005000000 | USD |
| CY2016Q4 | us-gaap |
Assets Current
AssetsCurrent
|
9722000000 | USD |
| CY2017Q4 | us-gaap |
Assets Current
AssetsCurrent
|
10072000000 | USD |
| CY2017 | us-gaap |
Business Combination Consideration Transferred1
BusinessCombinationConsiderationTransferred1
|
539000000 | USD |
| CY2017 | us-gaap |
Business Combination Pro Forma Information Earnings Or Loss Of Acquiree Since Acquisition Date Actual
BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
|
17000000 | USD |
| CY2017 | us-gaap |
Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual
BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
|
15000000 | USD |
| CY2016Q4 | us-gaap |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net
BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
|
2603000000 | USD |
| CY2015 | us-gaap |
Capital Expenditures Incurred But Not Yet Paid
CapitalExpendituresIncurredButNotYetPaid
|
844000000 | USD |
| CY2016 | us-gaap |
Capital Expenditures Incurred But Not Yet Paid
CapitalExpendituresIncurredButNotYetPaid
|
1300000000 | USD |
| CY2017 | us-gaap |
Capital Expenditures Incurred But Not Yet Paid
CapitalExpendituresIncurredButNotYetPaid
|
985000000 | USD |
| CY2016Q4 | us-gaap |
Capital Lease Obligations
CapitalLeaseObligations
|
136000000 | USD |
| CY2017Q4 | us-gaap |
Capital Lease Obligations
CapitalLeaseObligations
|
204000000 | USD |
| CY2016Q4 | us-gaap |
Capital Lease Obligations Current
CapitalLeaseObligationsCurrent
|
32000000 | USD |
| CY2017Q4 | us-gaap |
Capital Lease Obligations Current
CapitalLeaseObligationsCurrent
|
31000000 | USD |
| CY2016Q4 | us-gaap |
Capital Leases Balance Sheet Assets By Major Class Net
CapitalLeasesBalanceSheetAssetsByMajorClassNet
|
144000000 | USD |
| CY2017Q4 | us-gaap |
Capital Leases Balance Sheet Assets By Major Class Net
CapitalLeasesBalanceSheetAssetsByMajorClassNet
|
201000000 | USD |
| CY2016Q4 | us-gaap |
Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation
CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
|
69000000 | USD |
| CY2016Q4 | us-gaap |
Capitalization Longterm Debt And Equity
CapitalizationLongtermDebtAndEquity
|
69523000000 | USD |
| CY2017Q4 | us-gaap |
Capitalization Longterm Debt And Equity
CapitalizationLongtermDebtAndEquity
|
70314000000 | USD |
| CY2014Q4 | us-gaap |
Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
|
710000000 | USD |
| CY2015Q4 | us-gaap |
Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
|
1404000000 | USD |
| CY2017Q4 | us-gaap |
Debt Instrument Carrying Amount
DebtInstrumentCarryingAmount
|
48151000000 | USD |
| CY2016Q4 | us-gaap |
Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
|
1975000000 | USD |
| CY2017Q4 | us-gaap |
Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
|
2130000000 | USD |
| CY2015 | us-gaap |
Cash And Cash Equivalents Period Increase Decrease
CashAndCashEquivalentsPeriodIncreaseDecrease
|
694000000 | USD |
| CY2016 | us-gaap |
Cash And Cash Equivalents Period Increase Decrease
CashAndCashEquivalentsPeriodIncreaseDecrease
|
571000000 | USD |
| CY2017 | us-gaap |
Cash And Cash Equivalents Period Increase Decrease
CashAndCashEquivalentsPeriodIncreaseDecrease
|
155000000 | USD |
| CY2017 | us-gaap |
Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months
CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
|
-11000000 | USD |
| CY2016Q4 | us-gaap |
Collateral Already Posted Aggregate Fair Value
CollateralAlreadyPostedAggregateFairValue
|
62000000 | USD |
| CY2017Q4 | us-gaap |
Collateral Already Posted Aggregate Fair Value
CollateralAlreadyPostedAggregateFairValue
|
193000000 | USD |
| CY2016Q4 | us-gaap |
Commitments And Contingencies
CommitmentsAndContingencies
|
USD | |
| CY2017Q4 | us-gaap |
Commitments And Contingencies
CommitmentsAndContingencies
|
USD | |
| CY2015 | us-gaap |
Common Stock Dividends Per Share Cash Paid
CommonStockDividendsPerShareCashPaid
|
2.1525 | |
| CY2016Q1 | us-gaap |
Common Stock Dividends Per Share Cash Paid
CommonStockDividendsPerShareCashPaid
|
0.5425 | |
| CY2016Q2 | us-gaap |
Common Stock Dividends Per Share Cash Paid
CommonStockDividendsPerShareCashPaid
|
0.5600 | |
| CY2016Q3 | us-gaap |
Common Stock Dividends Per Share Cash Paid
CommonStockDividendsPerShareCashPaid
|
0.5600 | |
| CY2016Q4 | us-gaap |
Common Stock Dividends Per Share Cash Paid
CommonStockDividendsPerShareCashPaid
|
0.5600 | |
| CY2016 | us-gaap |
Common Stock Dividends Per Share Cash Paid
CommonStockDividendsPerShareCashPaid
|
2.2225 | |
| CY2017Q1 | us-gaap |
Common Stock Dividends Per Share Cash Paid
CommonStockDividendsPerShareCashPaid
|
0.56 | |
| CY2017Q2 | us-gaap |
Common Stock Dividends Per Share Cash Paid
CommonStockDividendsPerShareCashPaid
|
0.58 | |
| CY2017Q3 | us-gaap |
Common Stock Dividends Per Share Cash Paid
CommonStockDividendsPerShareCashPaid
|
0.58 | |
| CY2017Q4 | us-gaap |
Common Stock Dividends Per Share Cash Paid
CommonStockDividendsPerShareCashPaid
|
0.58 | |
| CY2017 | us-gaap |
Common Stock Dividends Per Share Cash Paid
CommonStockDividendsPerShareCashPaid
|
2.3000 | |
| CY2016Q4 | us-gaap |
Common Stock Par Or Stated Value Per Share
CommonStockParOrStatedValuePerShare
|
5 | |
| CY2017Q4 | us-gaap |
Common Stock Par Or Stated Value Per Share
CommonStockParOrStatedValuePerShare
|
5 | |
| CY2016Q4 | us-gaap |
Common Stock Shares Authorized
CommonStockSharesAuthorized
|
1500000000 | shares |
| CY2017Q4 | us-gaap |
Common Stock Shares Authorized
CommonStockSharesAuthorized
|
1500000000 | shares |
| CY2016Q4 | us-gaap |
Common Stock Shares Issued
CommonStockSharesIssued
|
991000000 | shares |
| CY2017Q4 | us-gaap |
Common Stock Shares Issued
CommonStockSharesIssued
|
1000000000 | shares |
| CY2016Q4 | us-gaap |
Common Stock Value
CommonStockValue
|
4952000000 | USD |
| CY2017Q4 | us-gaap |
Common Stock Value
CommonStockValue
|
5038000000 | USD |
| CY2015 | us-gaap |
Comprehensive Income Net Of Tax
ComprehensiveIncomeNetOfTax
|
2365000000 | USD |
| CY2016 | us-gaap |
Comprehensive Income Net Of Tax
ComprehensiveIncomeNetOfTax
|
2398000000 | USD |
| CY2017 | us-gaap |
Comprehensive Income Net Of Tax
ComprehensiveIncomeNetOfTax
|
833000000 | USD |
| CY2015 | us-gaap |
Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest
ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
|
14000000 | USD |
| CY2016 | us-gaap |
Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest
ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
|
36000000 | USD |
| CY2017 | us-gaap |
Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest
ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
|
46000000 | USD |
| CY2016Q4 | us-gaap |
Construction In Progress Gross
ConstructionInProgressGross
|
8977000000 | USD |
| CY2017Q4 | us-gaap |
Construction In Progress Gross
ConstructionInProgressGross
|
6904000000 | USD |
| CY2015 | us-gaap |
Cost Of Purchased Power
CostOfPurchasedPower
|
645000000 | USD |
| CY2016 | us-gaap |
Cost Of Purchased Power
CostOfPurchasedPower
|
750000000 | USD |
| CY2017 | us-gaap |
Cost Of Purchased Power
CostOfPurchasedPower
|
863000000 | USD |
| CY2015 | us-gaap |
Costs And Expenses
CostsAndExpenses
|
13207000000 | USD |
| CY2016 | us-gaap |
Costs And Expenses
CostsAndExpenses
|
15267000000 | USD |
| CY2017 | us-gaap |
Costs And Expenses
CostsAndExpenses
|
20480000000 | USD |
| CY2015 | us-gaap |
Current Federal Tax Expense Benefit
CurrentFederalTaxExpenseBenefit
|
-177000000 | USD |
| CY2016 | us-gaap |
Current Federal Tax Expense Benefit
CurrentFederalTaxExpenseBenefit
|
1184000000 | USD |
| CY2017 | us-gaap |
Current Federal Tax Expense Benefit
CurrentFederalTaxExpenseBenefit
|
-62000000 | USD |
| CY2015 | us-gaap |
Current State And Local Tax Expense Benefit
CurrentStateAndLocalTaxExpenseBenefit
|
-33000000 | USD |
| CY2016 | us-gaap |
Current State And Local Tax Expense Benefit
CurrentStateAndLocalTaxExpenseBenefit
|
-108000000 | USD |
| CY2017 | us-gaap |
Current State And Local Tax Expense Benefit
CurrentStateAndLocalTaxExpenseBenefit
|
37000000 | USD |
| CY2016Q4 | us-gaap |
Customer Deposits Current
CustomerDepositsCurrent
|
558000000 | USD |
| CY2017Q4 | us-gaap |
Customer Deposits Current
CustomerDepositsCurrent
|
542000000 | USD |
| CY2016Q4 | us-gaap |
Debt Instrument Carrying Amount
DebtInstrumentCarryingAmount
|
45080000000 | USD |
| CY2016Q4 | us-gaap |
Debt Instrument Fair Value
DebtInstrumentFairValue
|
46286000000 | USD |
| CY2017Q4 | us-gaap |
Debt Instrument Fair Value
DebtInstrumentFairValue
|
51348000000 | USD |
| CY2016Q4 | us-gaap |
Debt Instrument Unamortized Discount
DebtInstrumentUnamortizedDiscount
|
194000000 | USD |
| CY2017Q4 | us-gaap |
Debt Instrument Unamortized Discount
DebtInstrumentUnamortizedDiscount
|
206000000 | USD |
| CY2016Q4 | us-gaap |
Debt Instrument Unamortized Premium
DebtInstrumentUnamortizedPremium
|
52000000 | USD |
| CY2017Q4 | us-gaap |
Debt Instrument Unamortized Premium
DebtInstrumentUnamortizedPremium
|
44000000 | USD |
| CY2016Q4 | us-gaap |
Decommissioning Fund Investments
DecommissioningFundInvestments
|
1606000000 | USD |
| CY2016Q4 | us-gaap |
Decommissioning Fund Investments
DecommissioningFundInvestments
|
1600000000 | USD |
| CY2017Q4 | us-gaap |
Decommissioning Fund Investments
DecommissioningFundInvestments
|
1800000000 | USD |
| CY2017Q4 | us-gaap |
Decommissioning Fund Investments
DecommissioningFundInvestments
|
1832000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Credits And Other Liabilities
DeferredCreditsAndOtherLiabilities
|
27257000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Credits And Other Liabilities
DeferredCreditsAndOtherLiabilities
|
27097000000 | USD |
| CY2015 | us-gaap |
Deferred Federal Income Tax Expense Benefit
DeferredFederalIncomeTaxExpenseBenefit
|
1266000000 | USD |
| CY2016 | us-gaap |
Deferred Federal Income Tax Expense Benefit
DeferredFederalIncomeTaxExpenseBenefit
|
-342000000 | USD |
| CY2017 | us-gaap |
Deferred Federal Income Tax Expense Benefit
DeferredFederalIncomeTaxExpenseBenefit
|
-6000000 | USD |
| CY2015 | us-gaap |
Deferred Income Tax Expense Benefit
DeferredIncomeTaxExpenseBenefit
|
1404000000 | USD |
| CY2016 | us-gaap |
Deferred Income Tax Expense Benefit
DeferredIncomeTaxExpenseBenefit
|
-127000000 | USD |
| CY2017 | us-gaap |
Deferred Income Tax Expense Benefit
DeferredIncomeTaxExpenseBenefit
|
166000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Income Tax Liabilities
DeferredIncomeTaxLiabilities
|
23512000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Income Tax Liabilities
DeferredIncomeTaxLiabilities
|
15011000000 | USD |
| CY2015 | us-gaap |
Deferred State And Local Income Tax Expense Benefit
DeferredStateAndLocalIncomeTaxExpenseBenefit
|
138000000 | USD |
| CY2016 | us-gaap |
Deferred State And Local Income Tax Expense Benefit
DeferredStateAndLocalIncomeTaxExpenseBenefit
|
217000000 | USD |
| CY2017 | us-gaap |
Deferred State And Local Income Tax Expense Benefit
DeferredStateAndLocalIncomeTaxExpenseBenefit
|
173000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Assets Gross
DeferredTaxAssetsGross
|
9495000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Assets Gross
DeferredTaxAssetsGross
|
8424000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Assets Operating Loss Carryforwards State And Local
DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
|
249000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Assets Regulatory Assets And Liabilities
DeferredTaxAssetsRegulatoryAssetsAndLiabilities
|
825000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Assets Tax Credit Carryforwards
DeferredTaxAssetsTaxCreditCarryforwards
|
9000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Assets Valuation Allowance
DeferredTaxAssetsValuationAllowance
|
23000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Assets Valuation Allowance
DeferredTaxAssetsValuationAllowance
|
149000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Liabilities
DeferredTaxLiabilities
|
14040000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Liabilities
DeferredTaxLiabilities
|
6736000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Liabilities Noncurrent
DeferredTaxLiabilitiesNoncurrent
|
14092000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Liabilities Noncurrent
DeferredTaxLiabilitiesNoncurrent
|
6842000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Liabilities Regulatory Assets And Liabilities
DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities
|
7300000000 | USD |
| CY2016Q4 | us-gaap |
Defined Benefit Plan Accumulated Benefit Obligation
DefinedBenefitPlanAccumulatedBenefitObligation
|
11300000000 | USD |
| CY2017Q4 | us-gaap |
Defined Benefit Plan Accumulated Benefit Obligation
DefinedBenefitPlanAccumulatedBenefitObligation
|
12600000000 | USD |
| CY2017 | us-gaap |
Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1
DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1
|
113000000 | USD |
| CY2017 | us-gaap |
Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1
DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1
|
3000000 | USD |
| CY2017 | us-gaap |
Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation
DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation
|
132000000 | USD |
| CY2017 | us-gaap |
Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components
DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents
|
4000000 | USD |
| CY2017Q4 | us-gaap |
Defined Benefit Plan Plan Assets Target Allocation Percentage
DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
|
1 | |
| CY2017Q4 | us-gaap |
Defined Benefit Plan Weighted Average Asset Allocations
DefinedBenefitPlanWeightedAverageAssetAllocations
|
1 | |
| CY2015 | us-gaap |
Defined Contribution Plan Cost Recognized
DefinedContributionPlanCostRecognized
|
92000000 | USD |
| CY2016 | us-gaap |
Defined Contribution Plan Cost Recognized
DefinedContributionPlanCostRecognized
|
105000000 | USD |
| CY2017 | us-gaap |
Defined Contribution Plan Cost Recognized
DefinedContributionPlanCostRecognized
|
118000000 | USD |
| us-gaap |
Defined Contribution Plan Employer Discretionary Contribution Amount
DefinedContributionPlanEmployerDiscretionaryContributionAmount
|
0 | USD | |
| CY2015 | us-gaap |
Defined Contribution Plan Employer Discretionary Contribution Amount
DefinedContributionPlanEmployerDiscretionaryContributionAmount
|
2000000 | USD |
| us-gaap |
Defined Contribution Plan Employer Discretionary Contribution Amount
DefinedContributionPlanEmployerDiscretionaryContributionAmount
|
2000000 | USD | |
| CY2017 | us-gaap |
Defined Contribution Plan Employer Discretionary Contribution Amount
DefinedContributionPlanEmployerDiscretionaryContributionAmount
|
2000000 | USD |
| CY2015 | us-gaap |
Depreciation Amortization And Accretion Net
DepreciationAmortizationAndAccretionNet
|
2395000000 | USD |
| CY2016 | us-gaap |
Depreciation Amortization And Accretion Net
DepreciationAmortizationAndAccretionNet
|
2923000000 | USD |
| CY2017 | us-gaap |
Depreciation Amortization And Accretion Net
DepreciationAmortizationAndAccretionNet
|
3457000000 | USD |
| CY2017Q4 | us-gaap |
Derivative Collateral Obligation To Return Cash
DerivativeCollateralObligationToReturnCash
|
0 | USD |
| CY2015 | us-gaap |
Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net
DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
|
-9000000 | USD |
| CY2016 | us-gaap |
Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net
DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
|
-112000000 | USD |
| CY2017 | us-gaap |
Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net
DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
|
98000000 | USD |
| CY2015 | us-gaap |
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net
DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
|
-22000000 | USD |
| CY2016 | us-gaap |
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net
DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
|
-220000000 | USD |
| CY2017 | us-gaap |
Derivative Instruments Gain Loss Recognized In Other Comprehensive Income Effective Portion Net
DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
|
91000000 | USD |
| CY2015 | us-gaap |
Dividends Common Stock Cash
DividendsCommonStockCash
|
1959000000 | USD |
| CY2016 | us-gaap |
Dividends Common Stock Cash
DividendsCommonStockCash
|
2104000000 | USD |
| CY2017 | us-gaap |
Dividends Common Stock Cash
DividendsCommonStockCash
|
2300000000 | USD |
| CY2015 | us-gaap |
Earnings Per Share Basic
EarningsPerShareBasic
|
2.60 | |
| CY2016Q1 | us-gaap |
Earnings Per Share Basic
EarningsPerShareBasic
|
0.53 | |
| CY2016Q2 | us-gaap |
Earnings Per Share Basic
EarningsPerShareBasic
|
0.67 | |
| CY2016Q3 | us-gaap |
Earnings Per Share Basic
EarningsPerShareBasic
|
1.18 | |
| CY2016Q4 | us-gaap |
Earnings Per Share Basic
EarningsPerShareBasic
|
0.20 | |
| CY2016 | us-gaap |
Earnings Per Share Basic
EarningsPerShareBasic
|
2.57 | |
| CY2017Q1 | us-gaap |
Earnings Per Share Basic
EarningsPerShareBasic
|
0.66 | |
| CY2017Q2 | us-gaap |
Earnings Per Share Basic
EarningsPerShareBasic
|
-1.38 | |
| CY2017Q3 | us-gaap |
Earnings Per Share Basic
EarningsPerShareBasic
|
1.07 | |
| CY2017Q4 | us-gaap |
Earnings Per Share Basic
EarningsPerShareBasic
|
0.49 | |
| CY2017 | us-gaap |
Earnings Per Share Basic
EarningsPerShareBasic
|
0.84 | |
| CY2015 | us-gaap |
Earnings Per Share Diluted
EarningsPerShareDiluted
|
2.59 | |
| CY2016Q1 | us-gaap |
Earnings Per Share Diluted
EarningsPerShareDiluted
|
0.53 | |
| CY2016Q2 | us-gaap |
Earnings Per Share Diluted
EarningsPerShareDiluted
|
0.66 | |
| CY2016Q3 | us-gaap |
Earnings Per Share Diluted
EarningsPerShareDiluted
|
1.17 | |
| CY2016Q4 | us-gaap |
Earnings Per Share Diluted
EarningsPerShareDiluted
|
0.20 | |
| CY2016 | us-gaap |
Earnings Per Share Diluted
EarningsPerShareDiluted
|
2.55 | |
| CY2017Q1 | us-gaap |
Earnings Per Share Diluted
EarningsPerShareDiluted
|
0.66 | |
| CY2017Q2 | us-gaap |
Earnings Per Share Diluted
EarningsPerShareDiluted
|
-1.37 | |
| CY2017Q3 | us-gaap |
Earnings Per Share Diluted
EarningsPerShareDiluted
|
1.06 | |
| CY2017Q4 | us-gaap |
Earnings Per Share Diluted
EarningsPerShareDiluted
|
0.49 | |
| CY2017 | us-gaap |
Earnings Per Share Diluted
EarningsPerShareDiluted
|
0.84 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Continuing Operations
EffectiveIncomeTaxRateContinuingOperations
|
0.329 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Continuing Operations
EffectiveIncomeTaxRateContinuingOperations
|
0.273 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Continuing Operations
EffectiveIncomeTaxRateContinuingOperations
|
0.133 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
|
0.35 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
|
0.35 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
|
0.35 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate
EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
|
0.000 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate
EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
|
0.000 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate
EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
|
-0.256 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends
EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends
|
-0.012 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends
EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends
|
-0.041 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation
EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation
|
0.012 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation
EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation
|
0.009 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation
EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation
|
0.031 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Reconciliation Other Adjustments
EffectiveIncomeTaxRateReconciliationOtherAdjustments
|
0.002 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Reconciliation Other Adjustments
EffectiveIncomeTaxRateReconciliationOtherAdjustments
|
-0.004 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Reconciliation Other Adjustments
EffectiveIncomeTaxRateReconciliationOtherAdjustments
|
-0.027 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Reconciliation State And Local Income Taxes
EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
|
0.019 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Reconciliation State And Local Income Taxes
EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
|
0.021 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Reconciliation State And Local Income Taxes
EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
|
0.125 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Reconciliation Tax Credits
EffectiveIncomeTaxRateReconciliationTaxCredits
|
0.015 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Reconciliation Tax Credits
EffectiveIncomeTaxRateReconciliationTaxCredits
|
0.050 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Reconciliation Tax Credits
EffectiveIncomeTaxRateReconciliationTaxCredits
|
0.017 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Reconciliation Tax Credits Investment
EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment
|
0.000 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Reconciliation Tax Credits Investment
EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment
|
0.000 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Reconciliation Tax Credits Investment
EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment
|
-0.157 | |
| CY2017 | us-gaap |
Employee Service Share Based Compensation Tax Benefit From Compensation Expense
EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
|
4000000 | USD |
| CY2015 | us-gaap |
Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options
EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions
|
19000000 | USD |
| CY2016 | us-gaap |
Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options
EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions
|
46000000 | USD |
| CY2017 | us-gaap |
Employee Service Share Based Compensation Tax Benefit From Exercise Of Stock Options
EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions
|
25000000 | USD |
| CY2016Q4 | us-gaap |
Energy Marketing Contract Liabilities Current
EnergyMarketingContractLiabilitiesCurrent
|
597000000 | USD |
| CY2017Q4 | us-gaap |
Energy Marketing Contract Liabilities Current
EnergyMarketingContractLiabilitiesCurrent
|
546000000 | USD |
| CY2016Q4 | us-gaap |
Energy Marketing Contracts Assets Current
EnergyMarketingContractsAssetsCurrent
|
623000000 | USD |
| CY2017Q4 | us-gaap |
Energy Marketing Contracts Assets Current
EnergyMarketingContractsAssetsCurrent
|
607000000 | USD |
| CY2016Q4 | us-gaap |
Energy Related Inventory Natural Gas In Storage
EnergyRelatedInventoryNaturalGasInStorage
|
631000000 | USD |
| CY2017Q4 | us-gaap |
Energy Related Inventory Natural Gas In Storage
EnergyRelatedInventoryNaturalGasInStorage
|
595000000 | USD |
| CY2016Q4 | us-gaap |
Energy Related Inventory Other Fossil Fuel
EnergyRelatedInventoryOtherFossilFuel
|
689000000 | USD |
| CY2017Q4 | us-gaap |
Energy Related Inventory Other Fossil Fuel
EnergyRelatedInventoryOtherFossilFuel
|
594000000 | USD |
| CY2016Q4 | us-gaap |
Equity Method Investments
EquityMethodInvestments
|
1549000000 | USD |
| CY2017Q4 | us-gaap |
Equity Method Investments
EquityMethodInvestments
|
1513000000 | USD |
| CY2015 | us-gaap |
Federal Income Tax Expense Benefit Continuing Operations
FederalIncomeTaxExpenseBenefitContinuingOperations
|
1089000000 | USD |
| CY2016 | us-gaap |
Federal Income Tax Expense Benefit Continuing Operations
FederalIncomeTaxExpenseBenefitContinuingOperations
|
842000000 | USD |
| CY2017 | us-gaap |
Federal Income Tax Expense Benefit Continuing Operations
FederalIncomeTaxExpenseBenefitContinuingOperations
|
-68000000 | USD |
| CY2016Q4 | us-gaap |
Finite Lived Intangible Assets Accumulated Amortization
FiniteLivedIntangibleAssetsAccumulatedAmortization
|
62000000 | USD |
| CY2017Q4 | us-gaap |
Finite Lived Intangible Assets Accumulated Amortization
FiniteLivedIntangibleAssetsAccumulatedAmortization
|
186000000 | USD |
| CY2017Q4 | us-gaap |
Finite Lived Intangible Assets Amortization Expense Next Twelve Months
FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
|
95000000 | USD |
| CY2017Q4 | us-gaap |
Finite Lived Intangible Assets Amortization Expense Year Five
FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
|
51000000 | USD |
| CY2017Q4 | us-gaap |
Finite Lived Intangible Assets Amortization Expense Year Four
FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
|
56000000 | USD |
| CY2017Q4 | us-gaap |
Finite Lived Intangible Assets Amortization Expense Year Three
FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
|
65000000 | USD |
| CY2017Q4 | us-gaap |
Finite Lived Intangible Assets Amortization Expense Year Two
FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
|
77000000 | USD |
| CY2016Q4 | us-gaap |
Finite Lived Intangible Assets Gross
FiniteLivedIntangibleAssetsGross
|
957000000 | USD |
| CY2017Q4 | us-gaap |
Finite Lived Intangible Assets Gross
FiniteLivedIntangibleAssetsGross
|
984000000 | USD |
| CY2016Q4 | us-gaap |
Finite Lived Intangible Assets Net
FiniteLivedIntangibleAssetsNet
|
895000000 | USD |
| CY2017Q4 | us-gaap |
Finite Lived Intangible Assets Net
FiniteLivedIntangibleAssetsNet
|
798000000 | USD |
| CY2016Q4 | us-gaap |
Goodwill
Goodwill
|
6300000000 | USD |
| CY2016Q4 | us-gaap |
Goodwill
Goodwill
|
6251000000 | USD |
| CY2017Q4 | us-gaap |
Goodwill
Goodwill
|
6268000000 | USD |
| CY2015 | us-gaap |
Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest
IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
|
3629000000 | USD |
| CY2016 | us-gaap |
Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest
IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
|
3480000000 | USD |
| CY2017 | us-gaap |
Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest
IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
|
1068000000 | USD |
| us-gaap |
Income Loss From Equity Method Investments
IncomeLossFromEquityMethodInvestments
|
15000000 | USD | |
| CY2015 | us-gaap |
Income Loss From Equity Method Investments
IncomeLossFromEquityMethodInvestments
|
0 | USD |
| CY2016 | us-gaap |
Income Loss From Equity Method Investments
IncomeLossFromEquityMethodInvestments
|
59000000 | USD |
| CY2017 | us-gaap |
Income Loss From Equity Method Investments
IncomeLossFromEquityMethodInvestments
|
106000000 | USD |
| CY2015 | us-gaap |
Income Tax Expense Benefit
IncomeTaxExpenseBenefit
|
1194000000 | USD |
| CY2016 | us-gaap |
Income Tax Expense Benefit
IncomeTaxExpenseBenefit
|
951000000 | USD |
| CY2017 | us-gaap |
Income Tax Expense Benefit
IncomeTaxExpenseBenefit
|
142000000 | USD |
| CY2015 | us-gaap |
Income Taxes Paid Net
IncomeTaxesPaidNet
|
-9000000 | USD |
| CY2016 | us-gaap |
Income Taxes Paid Net
IncomeTaxesPaidNet
|
-148000000 | USD |
| CY2017 | us-gaap |
Income Taxes Paid Net
IncomeTaxesPaidNet
|
-410000000 | USD |
| CY2016Q4 | us-gaap |
Income Taxes Receivable
IncomeTaxesReceivable
|
544000000 | USD |
| CY2017Q4 | us-gaap |
Income Taxes Receivable
IncomeTaxesReceivable
|
63000000 | USD |
| CY2015 | us-gaap |
Increase Decrease In Accounts Payable
IncreaseDecreaseInAccountsPayable
|
-353000000 | USD |
| CY2016 | us-gaap |
Increase Decrease In Accounts Payable
IncreaseDecreaseInAccountsPayable
|
301000000 | USD |
| CY2017 | us-gaap |
Increase Decrease In Accounts Payable
IncreaseDecreaseInAccountsPayable
|
-280000000 | USD |
| CY2015 | us-gaap |
Increase Decrease In Deposits
IncreaseDecreaseInDeposits
|
0 | USD |
| CY2016 | us-gaap |
Increase Decrease In Deposits
IncreaseDecreaseInDeposits
|
-102000000 | USD |
| CY2017 | us-gaap |
Increase Decrease In Deposits
IncreaseDecreaseInDeposits
|
-4000000 | USD |
| CY2015 | us-gaap |
Increase Decrease In Fossil Fuel Inventories
IncreaseDecreaseInFossilFuelInventories
|
-61000000 | USD |
| CY2016 | us-gaap |
Increase Decrease In Fossil Fuel Inventories
IncreaseDecreaseInFossilFuelInventories
|
-178000000 | USD |
| CY2017 | us-gaap |
Increase Decrease In Fossil Fuel Inventories
IncreaseDecreaseInFossilFuelInventories
|
-36000000 | USD |
| CY2015 | us-gaap |
Increase Decrease In Income Taxes Receivable
IncreaseDecreaseInIncomeTaxesReceivable
|
413000000 | USD |
| CY2016 | us-gaap |
Increase Decrease In Income Taxes Receivable
IncreaseDecreaseInIncomeTaxesReceivable
|
122000000 | USD |
| CY2017 | us-gaap |
Increase Decrease In Income Taxes Receivable
IncreaseDecreaseInIncomeTaxesReceivable
|
47000000 | USD |
| CY2015 | us-gaap |
Increase Decrease In Other Operating Assets
IncreaseDecreaseInOtherOperatingAssets
|
152000000 | USD |
| CY2016 | us-gaap |
Increase Decrease In Other Operating Assets
IncreaseDecreaseInOtherOperatingAssets
|
206000000 | USD |
| CY2017 | us-gaap |
Increase Decrease In Other Operating Assets
IncreaseDecreaseInOtherOperatingAssets
|
143000000 | USD |
| CY2015 | us-gaap |
Increase Decrease In Other Operating Liabilities
IncreaseDecreaseInOtherOperatingLiabilities
|
58000000 | USD |
| CY2016 | us-gaap |
Increase Decrease In Other Operating Liabilities
IncreaseDecreaseInOtherOperatingLiabilities
|
250000000 | USD |
| CY2017 | us-gaap |
Increase Decrease In Other Operating Liabilities
IncreaseDecreaseInOtherOperatingLiabilities
|
-45000000 | USD |
| CY2015 | us-gaap |
Increase Decrease In Receivables
IncreaseDecreaseInReceivables
|
-243000000 | USD |
| CY2016 | us-gaap |
Increase Decrease In Receivables
IncreaseDecreaseInReceivables
|
544000000 | USD |
| CY2017 | us-gaap |
Increase Decrease In Receivables
IncreaseDecreaseInReceivables
|
199000000 | USD |
| CY2015 | us-gaap |
Incremental Common Shares Attributable To Share Based Payment Arrangements
IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
|
4000000 | shares |
| CY2016 | us-gaap |
Incremental Common Shares Attributable To Share Based Payment Arrangements
IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
|
7000000 | shares |
| CY2017 | us-gaap |
Incremental Common Shares Attributable To Share Based Payment Arrangements
IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
|
8000000 | shares |
| CY2016Q4 | us-gaap |
Intangible Assets Gross Excluding Goodwill
IntangibleAssetsGrossExcludingGoodwill
|
1032000000 | USD |
| CY2017Q4 | us-gaap |
Intangible Assets Gross Excluding Goodwill
IntangibleAssetsGrossExcludingGoodwill
|
1059000000 | USD |
| CY2016Q4 | us-gaap |
Intangible Assets Net Excluding Goodwill
IntangibleAssetsNetExcludingGoodwill
|
970000000 | USD |
| CY2017Q4 | us-gaap |
Intangible Assets Net Excluding Goodwill
IntangibleAssetsNetExcludingGoodwill
|
873000000 | USD |
| CY2015 | us-gaap |
Interest And Debt Expense
InterestAndDebtExpense
|
840000000 | USD |
| CY2016 | us-gaap |
Interest And Debt Expense
InterestAndDebtExpense
|
1317000000 | USD |
| CY2017 | us-gaap |
Interest And Debt Expense
InterestAndDebtExpense
|
1694000000 | USD |
| CY2015 | us-gaap |
Interest Paid Capitalized
InterestPaidCapitalized
|
124000000 | USD |
| CY2016 | us-gaap |
Interest Paid Capitalized
InterestPaidCapitalized
|
125000000 | USD |
| CY2017 | us-gaap |
Interest Paid Capitalized
InterestPaidCapitalized
|
89000000 | USD |
| CY2015 | us-gaap |
Interest Paid Net
InterestPaidNet
|
809000000 | USD |
| CY2016 | us-gaap |
Interest Paid Net
InterestPaidNet
|
1100000000 | USD |
| CY2017 | us-gaap |
Interest Paid Net
InterestPaidNet
|
1700000000 | USD |
| CY2016Q4 | us-gaap |
Interest Payable Current
InterestPayableCurrent
|
518000000 | USD |
| CY2017Q4 | us-gaap |
Interest Payable Current
InterestPayableCurrent
|
488000000 | USD |
| CY2017Q4 | us-gaap |
Interest Rate Cash Flow Hedge Gain Loss To Be Reclassified During Next12 Months Net
InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet
|
-20000000 | USD |
| CY2015 | us-gaap |
Investment Income Interest And Dividend
InvestmentIncomeInterestAndDividend
|
23000000 | USD |
| CY2016 | us-gaap |
Investment Income Interest And Dividend
InvestmentIncomeInterestAndDividend
|
20000000 | USD |
| CY2017 | us-gaap |
Investment Income Interest And Dividend
InvestmentIncomeInterestAndDividend
|
26000000 | USD |
| CY2016Q4 | us-gaap |
Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust Current
JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustCurrent
|
206000000 | USD |
| CY2017Q4 | us-gaap |
Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust Current
JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrustCurrent
|
206000000 | USD |
| CY2015 | us-gaap |
Lease And Rental Expense
LeaseAndRentalExpense
|
130000000 | USD |
| CY2016 | us-gaap |
Lease And Rental Expense
LeaseAndRentalExpense
|
169000000 | USD |
| CY2017 | us-gaap |
Lease And Rental Expense
LeaseAndRentalExpense
|
176000000 | USD |
| CY2017Q4 | us-gaap |
Leveraged Leases Balance Sheet Investment In Leveraged Leases
LeveragedLeasesBalanceSheetInvestmentInLeveragedLeases
|
86000000 | USD |
| CY2016Q4 | us-gaap |
Leveraged Leases Balance Sheet Investment In Leveraged Leases Net
LeveragedLeasesBalanceSheetInvestmentInLeveragedLeasesNet
|
774000000 | USD |
| CY2017Q4 | us-gaap |
Leveraged Leases Balance Sheet Investment In Leveraged Leases Net
LeveragedLeasesBalanceSheetInvestmentInLeveragedLeasesNet
|
775000000 | USD |
| CY2016Q4 | us-gaap |
Liabilities
Liabilities
|
82803000000 | USD |
| CY2017Q4 | us-gaap |
Liabilities
Liabilities
|
85153000000 | USD |
| CY2016Q4 | us-gaap |
Liabilities And Stockholders Equity
LiabilitiesAndStockholdersEquity
|
109697000000 | USD |
| CY2017Q4 | us-gaap |
Liabilities And Stockholders Equity
LiabilitiesAndStockholdersEquity
|
111005000000 | USD |
| CY2016Q4 | us-gaap |
Liabilities Current
LiabilitiesCurrent
|
12917000000 | USD |
| CY2017Q4 | us-gaap |
Liabilities Current
LiabilitiesCurrent
|
13594000000 | USD |
| CY2017 | us-gaap |
Line Of Credit Facility Commitment Fee Percentage
LineOfCreditFacilityCommitmentFeePercentage
|
0.0025 | |
| CY2017Q4 | us-gaap |
Line Of Credit Facility Maximum Borrowing Capacity
LineOfCreditFacilityMaximumBorrowingCapacity
|
8145000000 | USD |
| CY2017Q4 | us-gaap |
Line Of Credit Facility Remaining Borrowing Capacity
LineOfCreditFacilityRemainingBorrowingCapacity
|
8094000000 | USD |
| CY2016Q4 | us-gaap |
Long Term Debt And Capital Lease Obligations
LongTermDebtAndCapitalLeaseObligations
|
42629000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt And Capital Lease Obligations
LongTermDebtAndCapitalLeaseObligations
|
44462000000 | USD |
| CY2016Q4 | us-gaap |
Long Term Debt And Capital Lease Obligations Current
LongTermDebtAndCapitalLeaseObligationsCurrent
|
2587000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt And Capital Lease Obligations Current
LongTermDebtAndCapitalLeaseObligationsCurrent
|
3892000000 | USD |
| CY2016Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal After Year Five
LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
|
20369000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal After Year Five
LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
|
22142000000 | USD |
| CY2016Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Next Twelve Months
LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
|
2403000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Next Twelve Months
LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
|
2402000000 | USD |
| CY2016Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Year Five
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
|
1378000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Year Five
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
|
2016000000 | USD |
| CY2016Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Year Four
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
|
2655000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Year Four
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
|
2643000000 | USD |
| CY2016Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Year Three
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
|
1326000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Year Three
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
|
2273000000 | USD |
| CY2016Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Year Two
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
|
3076000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Year Two
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
|
3074000000 | USD |
| CY2016Q4 | us-gaap |
Long Term Investments
LongTermInvestments
|
11420000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Investments
LongTermInvestments
|
11510000000 | USD |
| CY2016Q4 | us-gaap |
Minority Interest
MinorityInterest
|
1854000000 | USD |
| CY2017Q4 | us-gaap |
Minority Interest
MinorityInterest
|
1361000000 | USD |
| CY2015 | us-gaap |
Minority Interest Decrease From Distributions To Noncontrolling Interest Holders
MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
|
18000000 | USD |
| CY2016 | us-gaap |
Minority Interest Decrease From Distributions To Noncontrolling Interest Holders
MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
|
57000000 | USD |
| CY2017 | us-gaap |
Minority Interest Decrease From Distributions To Noncontrolling Interest Holders
MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
|
122000000 | USD |
| CY2016 | us-gaap |
Minority Interest Decrease From Redemptions
MinorityInterestDecreaseFromRedemptions
|
129000000 | USD |
| CY2015 | us-gaap |
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
|
1700000000 | USD |
| CY2016 | us-gaap |
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
|
15725000000 | USD |
| CY2017 | us-gaap |
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
|
951000000 | USD |
| CY2015 | us-gaap |
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
|
-7280000000 | USD |
| CY2016 | us-gaap |
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
|
-20048000000 | USD |
| CY2017 | us-gaap |
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
|
-7191000000 | USD |
| CY2015 | us-gaap |
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
|
6274000000 | USD |
| CY2016 | us-gaap |
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
|
4894000000 | USD |
| CY2017 | us-gaap |
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
|
6395000000 | USD |
| CY2015 | us-gaap |
Net Income Loss Attributable To Noncontrolling Interest
NetIncomeLossAttributableToNoncontrollingInterest
|
14000000 | USD |
| CY2016 | us-gaap |
Net Income Loss Attributable To Noncontrolling Interest
NetIncomeLossAttributableToNoncontrollingInterest
|
36000000 | USD |
| CY2017 | us-gaap |
Net Income Loss Attributable To Noncontrolling Interest
NetIncomeLossAttributableToNoncontrollingInterest
|
46000000 | USD |
| CY2015 | us-gaap |
Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
|
2367000000 | USD |
| CY2016Q1 | us-gaap |
Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
|
489000000 | USD |
| CY2016Q2 | us-gaap |
Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
|
623000000 | USD |
| CY2016Q3 | us-gaap |
Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
|
1139000000 | USD |
| CY2016Q4 | us-gaap |
Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
|
197000000 | USD |
| CY2016 | us-gaap |
Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
|
2448000000 | USD |
| CY2017Q1 | us-gaap |
Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
|
658000000 | USD |
| CY2017Q2 | us-gaap |
Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
|
-1381000000 | USD |
| CY2017Q3 | us-gaap |
Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
|
1069000000 | USD |
| CY2017Q4 | us-gaap |
Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
|
496000000 | USD |
| CY2017 | us-gaap |
Net Income Loss Available To Common Stockholders Basic
NetIncomeLossAvailableToCommonStockholdersBasic
|
842000000 | USD |
| CY2016Q4 | us-gaap |
Net Regulatory Assets
NetRegulatoryAssets
|
5866000000 | USD |
| CY2017Q4 | us-gaap |
Net Regulatory Assets
NetRegulatoryAssets
|
-1894000000 | USD |
| CY2015 | us-gaap |
Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable
NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable
|
-12000000 | USD |
| CY2016 | us-gaap |
Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable
NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable
|
-32000000 | USD |
| CY2017 | us-gaap |
Noncontrolling Interest In Net Income Loss Other Noncontrolling Interests Redeemable
NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable
|
-44000000 | USD |
| CY2015 | us-gaap |
Nonoperating Income Expense
NonoperatingIncomeExpense
|
-653000000 | USD |
| CY2016 | us-gaap |
Nonoperating Income Expense
NonoperatingIncomeExpense
|
-1149000000 | USD |
| CY2017 | us-gaap |
Nonoperating Income Expense
NonoperatingIncomeExpense
|
-1483000000 | USD |
| CY2015 | us-gaap |
Operating Income Loss
OperatingIncomeLoss
|
4282000000 | USD |
| CY2016Q1 | us-gaap |
Operating Income Loss
OperatingIncomeLoss
|
940000000 | USD |
| CY2016Q2 | us-gaap |
Operating Income Loss
OperatingIncomeLoss
|
1185000000 | USD |
| CY2016Q3 | us-gaap |
Operating Income Loss
OperatingIncomeLoss
|
1917000000 | USD |
| CY2016Q4 | us-gaap |
Operating Income Loss
OperatingIncomeLoss
|
587000000 | USD |
| CY2016 | us-gaap |
Operating Income Loss
OperatingIncomeLoss
|
4629000000 | USD |
| CY2017Q1 | us-gaap |
Operating Income Loss
OperatingIncomeLoss
|
1306000000 | USD |
| CY2017Q2 | us-gaap |
Operating Income Loss
OperatingIncomeLoss
|
-1594000000 | USD |
| CY2017Q3 | us-gaap |
Operating Income Loss
OperatingIncomeLoss
|
2045000000 | USD |
| CY2017Q4 | us-gaap |
Operating Income Loss
OperatingIncomeLoss
|
794000000 | USD |
| CY2017 | us-gaap |
Operating Income Loss
OperatingIncomeLoss
|
2551000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Due
OperatingLeasesFutureMinimumPaymentsDue
|
1527000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Due Current
OperatingLeasesFutureMinimumPaymentsDueCurrent
|
149000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Due In Five Years
OperatingLeasesFutureMinimumPaymentsDueInFiveYears
|
83000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Due In Four Years
OperatingLeasesFutureMinimumPaymentsDueInFourYears
|
95000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Due In Three Years
OperatingLeasesFutureMinimumPaymentsDueInThreeYears
|
108000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Due In Two Years
OperatingLeasesFutureMinimumPaymentsDueInTwoYears
|
124000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Due Thereafter
OperatingLeasesFutureMinimumPaymentsDueThereafter
|
968000000 | USD |
| CY2017Q4 | us-gaap |
Operating Loss Carryforwards
OperatingLossCarryforwards
|
2300000000 | USD |
| CY2016Q4 | us-gaap |
Other Assets Current
OtherAssetsCurrent
|
230000000 | USD |
| CY2017Q4 | us-gaap |
Other Assets Current
OtherAssetsCurrent
|
211000000 | USD |
| CY2016Q4 | us-gaap |
Other Assets Noncurrent
OtherAssetsNoncurrent
|
1406000000 | USD |
| CY2017Q4 | us-gaap |
Other Assets Noncurrent
OtherAssetsNoncurrent
|
1577000000 | USD |
| CY2015 | us-gaap |
Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax
OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
|
-2000000 | USD |
| CY2016 | us-gaap |
Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax
OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
|
13000000 | USD |
| CY2017 | us-gaap |
Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax
OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
|
17000000 | USD |
| CY2015 | us-gaap |
Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax
OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax
|
-1000000 | USD |
| CY2016 | us-gaap |
Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax
OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax
|
10000000 | USD |
| CY2017 | us-gaap |
Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax
OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax
|
6000000 | USD |
| CY2015 | us-gaap |
Other Comprehensive Income Loss Net Of Tax
OtherComprehensiveIncomeLossNetOfTax
|
-2000000 | USD |
| CY2016 | us-gaap |
Other Comprehensive Income Loss Net Of Tax
OtherComprehensiveIncomeLossNetOfTax
|
-50000000 | USD |
| CY2017 | us-gaap |
Other Comprehensive Income Loss Net Of Tax
OtherComprehensiveIncomeLossNetOfTax
|
-9000000 | USD |
| CY2015 | us-gaap |
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
|
-2000000 | USD |
| CY2016 | us-gaap |
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
|
-50000000 | USD |
| CY2017 | us-gaap |
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
|
-9000000 | USD |
| CY2015 | us-gaap |
Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
|
-6000000 | USD |
| CY2016 | us-gaap |
Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
|
-69000000 | USD |
| CY2017 | us-gaap |
Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
|
60000000 | USD |
| CY2015 | us-gaap |
Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax
|
-4000000 | USD |
| CY2016 | us-gaap |
Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax
|
-43000000 | USD |
| CY2017 | us-gaap |
Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax
|
37000000 | USD |
| CY2015 | us-gaap |
Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
|
-7000000 | USD |
| CY2016 | us-gaap |
Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
|
-4000000 | USD |
| CY2017 | us-gaap |
Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
|
23000000 | USD |
| CY2015 | us-gaap |
Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
|
-4000000 | USD |
| CY2016 | us-gaap |
Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
|
-3000000 | USD |
| CY2017 | us-gaap |
Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax
|
6000000 | USD |
| CY2015 | us-gaap |
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax
OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
|
-13000000 | USD |
| CY2016 | us-gaap |
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax
OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
|
-136000000 | USD |
| CY2017 | us-gaap |
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax
OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
|
57000000 | USD |
| CY2015 | us-gaap |
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax
OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
|
-8000000 | USD |
| CY2016 | us-gaap |
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax
OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
|
-84000000 | USD |
| CY2017 | us-gaap |
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax
OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
|
34000000 | USD |
| CY2015 | us-gaap |
Other Cost Of Operating Revenue
OtherCostOfOperatingRevenue
|
0 | USD |
| CY2016 | us-gaap |
Other Cost Of Operating Revenue
OtherCostOfOperatingRevenue
|
260000000 | USD |
| CY2017 | us-gaap |
Other Cost Of Operating Revenue
OtherCostOfOperatingRevenue
|
513000000 | USD |
| CY2016Q4 | us-gaap |
Other Inventory Supplies
OtherInventorySupplies
|
1462000000 | USD |
| CY2017Q4 | us-gaap |
Other Inventory Supplies
OtherInventorySupplies
|
1438000000 | USD |
| CY2016Q4 | us-gaap |
Other Liabilities Current
OtherLiabilitiesCurrent
|
925000000 | USD |
| CY2017Q4 | us-gaap |
Other Liabilities Current
OtherLiabilitiesCurrent
|
868000000 | USD |
| CY2016Q4 | us-gaap |
Other Liabilities Noncurrent
OtherLiabilitiesNoncurrent
|
880000000 | USD |
| CY2017Q4 | us-gaap |
Other Liabilities Noncurrent
OtherLiabilitiesNoncurrent
|
691000000 | USD |
| CY2016Q4 | us-gaap |
Other Long Term Debt
OtherLongTermDebt
|
9404000000 | USD |
| CY2017Q4 | us-gaap |
Other Long Term Debt
OtherLongTermDebt
|
10987000000 | USD |
| CY2016Q4 | us-gaap |
Other Long Term Debt Current
OtherLongTermDebtCurrent
|
485000000 | USD |
| CY2017Q4 | us-gaap |
Other Long Term Debt Current
OtherLongTermDebtCurrent
|
1420000000 | USD |
| CY2016Q4 | us-gaap |
Other Long Term Investments
OtherLongTermInvestments
|
270000000 | USD |
| CY2017Q4 | us-gaap |
Other Long Term Investments
OtherLongTermInvestments
|
249000000 | USD |
| CY2015 | us-gaap |
Other Noncash Income Expense
OtherNoncashIncomeExpense
|
-49000000 | USD |
| CY2016 | us-gaap |
Other Noncash Income Expense
OtherNoncashIncomeExpense
|
99000000 | USD |
| CY2017 | us-gaap |
Other Noncash Income Expense
OtherNoncashIncomeExpense
|
109000000 | USD |
| CY2015 | us-gaap |
Other Nonoperating Income Expense
OtherNonoperatingIncomeExpense
|
-39000000 | USD |
| CY2016 | us-gaap |
Other Nonoperating Income Expense
OtherNonoperatingIncomeExpense
|
-93000000 | USD |
| CY2017 | us-gaap |
Other Nonoperating Income Expense
OtherNonoperatingIncomeExpense
|
-55000000 | USD |
| CY2015 | us-gaap |
Other Sales Revenue Net
OtherSalesRevenueNet
|
47000000 | USD |
| CY2016 | us-gaap |
Other Sales Revenue Net
OtherSalesRevenueNet
|
442000000 | USD |
| CY2017 | us-gaap |
Other Sales Revenue Net
OtherSalesRevenueNet
|
803000000 | USD |
| CY2015 | us-gaap |
Payments For Proceeds From Other Investing Activities
PaymentsForProceedsFromOtherInvestingActivities
|
-87000000 | USD |
| CY2016 | us-gaap |
Payments For Proceeds From Other Investing Activities
PaymentsForProceedsFromOtherInvestingActivities
|
108000000 | USD |
| CY2017 | us-gaap |
Payments For Proceeds From Other Investing Activities
PaymentsForProceedsFromOtherInvestingActivities
|
-42000000 | USD |
| CY2015 | us-gaap |
Payments For Proceeds From Removal Costs
PaymentsForProceedsFromRemovalCosts
|
167000000 | USD |
| CY2016 | us-gaap |
Payments For Proceeds From Removal Costs
PaymentsForProceedsFromRemovalCosts
|
245000000 | USD |
| CY2017 | us-gaap |
Payments For Proceeds From Removal Costs
PaymentsForProceedsFromRemovalCosts
|
313000000 | USD |
| CY2015 | us-gaap |
Payments For Repurchase Of Common Stock
PaymentsForRepurchaseOfCommonStock
|
115000000 | USD |
| CY2016 | us-gaap |
Payments For Repurchase Of Common Stock
PaymentsForRepurchaseOfCommonStock
|
0 | USD |
| CY2017 | us-gaap |
Payments For Repurchase Of Common Stock
PaymentsForRepurchaseOfCommonStock
|
0 | USD |
| CY2015 | us-gaap |
Payments For Repurchase Of Preferred Stock And Preference Stock
PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
|
412000000 | USD |
| CY2016 | us-gaap |
Payments For Repurchase Of Preferred Stock And Preference Stock
PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
|
0 | USD |
| CY2017 | us-gaap |
Payments For Repurchase Of Preferred Stock And Preference Stock
PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
|
658000000 | USD |
| CY2015 | us-gaap |
Payments Of Dividends Common Stock
PaymentsOfDividendsCommonStock
|
1959000000 | USD |
| CY2016 | us-gaap |
Payments Of Dividends Common Stock
PaymentsOfDividendsCommonStock
|
2104000000 | USD |
| CY2017 | us-gaap |
Payments Of Dividends Common Stock
PaymentsOfDividendsCommonStock
|
2300000000 | USD |
| CY2015 | us-gaap |
Payments To Acquire Businesses Net Of Cash Acquired
PaymentsToAcquireBusinessesNetOfCashAcquired
|
1719000000 | USD |
| CY2016 | us-gaap |
Payments To Acquire Businesses Net Of Cash Acquired
PaymentsToAcquireBusinessesNetOfCashAcquired
|
10689000000 | USD |
| CY2017 | us-gaap |
Payments To Acquire Businesses Net Of Cash Acquired
PaymentsToAcquireBusinessesNetOfCashAcquired
|
1070000000 | USD |
| CY2015 | us-gaap |
Payments To Acquire Equity Method Investments
PaymentsToAcquireEquityMethodInvestments
|
0 | USD |
| CY2016 | us-gaap |
Payments To Acquire Equity Method Investments
PaymentsToAcquireEquityMethodInvestments
|
1444000000 | USD |
| CY2017 | us-gaap |
Payments To Acquire Equity Method Investments
PaymentsToAcquireEquityMethodInvestments
|
152000000 | USD |
| CY2015 | us-gaap |
Payments To Acquire Productive Assets
PaymentsToAcquireProductiveAssets
|
6169000000 | USD |
| CY2016 | us-gaap |
Payments To Acquire Productive Assets
PaymentsToAcquireProductiveAssets
|
7624000000 | USD |
| CY2017 | us-gaap |
Payments To Acquire Productive Assets
PaymentsToAcquireProductiveAssets
|
5984000000 | USD |
| CY2015 | us-gaap |
Payments To Acquire Property Plant And Equipment
PaymentsToAcquirePropertyPlantAndEquipment
|
5674000000 | USD |
| CY2016 | us-gaap |
Payments To Acquire Property Plant And Equipment
PaymentsToAcquirePropertyPlantAndEquipment
|
7310000000 | USD |
| CY2017 | us-gaap |
Payments To Acquire Property Plant And Equipment
PaymentsToAcquirePropertyPlantAndEquipment
|
7423000000 | USD |
| CY2015 | us-gaap |
Payments To Invest In Decommissioning Fund
PaymentsToInvestInDecommissioningFund
|
1424000000 | USD |
| CY2016 | us-gaap |
Payments To Invest In Decommissioning Fund
PaymentsToInvestInDecommissioningFund
|
1160000000 | USD |
| CY2017 | us-gaap |
Payments To Invest In Decommissioning Fund
PaymentsToInvestInDecommissioningFund
|
811000000 | USD |
| CY2015 | us-gaap |
Payments To Minority Shareholders
PaymentsToMinorityShareholders
|
18000000 | USD |
| CY2016 | us-gaap |
Payments To Minority Shareholders
PaymentsToMinorityShareholders
|
72000000 | USD |
| CY2017 | us-gaap |
Payments To Minority Shareholders
PaymentsToMinorityShareholders
|
119000000 | USD |
| CY2015 | us-gaap |
Pension And Other Postretirement Benefit Contributions
PensionAndOtherPostretirementBenefitContributions
|
7000000 | USD |
| CY2016 | us-gaap |
Pension And Other Postretirement Benefit Contributions
PensionAndOtherPostretirementBenefitContributions
|
1029000000 | USD |
| CY2017 | us-gaap |
Pension And Other Postretirement Benefit Contributions
PensionAndOtherPostretirementBenefitContributions
|
2000000 | USD |
| CY2016Q4 | us-gaap |
Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent
PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
|
2299000000 | USD |
| CY2017Q4 | us-gaap |
Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent
PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
|
2256000000 | USD |
| CY2015 | us-gaap |
Preferred Stock Dividends Income Statement Impact
PreferredStockDividendsIncomeStatementImpact
|
54000000 | USD |
| CY2016 | us-gaap |
Preferred Stock Dividends Income Statement Impact
PreferredStockDividendsIncomeStatementImpact
|
45000000 | USD |
| CY2017 | us-gaap |
Preferred Stock Dividends Income Statement Impact
PreferredStockDividendsIncomeStatementImpact
|
38000000 | USD |
| CY2016Q4 | us-gaap |
Prepaid Expense Current
PrepaidExpenseCurrent
|
364000000 | USD |
| CY2016Q4 | us-gaap |
Property Plant And Equipment Gross
PropertyPlantAndEquipmentGross
|
98416000000 | USD |
| CY2017Q4 | us-gaap |
Property Plant And Equipment Gross
PropertyPlantAndEquipmentGross
|
103542000000 | USD |
| CY2017Q4 | us-gaap |
Prepaid Expense Current
PrepaidExpenseCurrent
|
452000000 | USD |
| CY2015 | us-gaap |
Proceeds From Decommissioning Fund
ProceedsFromDecommissioningFund
|
1418000000 | USD |
| CY2016 | us-gaap |
Proceeds From Decommissioning Fund
ProceedsFromDecommissioningFund
|
1154000000 | USD |
| CY2017 | us-gaap |
Proceeds From Decommissioning Fund
ProceedsFromDecommissioningFund
|
805000000 | USD |
| CY2015 | us-gaap |
Proceeds From Issuance Of Common Stock
ProceedsFromIssuanceOfCommonStock
|
256000000 | USD |
| CY2016 | us-gaap |
Proceeds From Issuance Of Common Stock
ProceedsFromIssuanceOfCommonStock
|
3758000000 | USD |
| CY2017 | us-gaap |
Proceeds From Issuance Of Common Stock
ProceedsFromIssuanceOfCommonStock
|
793000000 | USD |
| CY2015 | us-gaap |
Proceeds From Issuance Of Long Term Debt And Capital Securities Net
ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet
|
7029000000 | USD |
| CY2016 | us-gaap |
Proceeds From Issuance Of Long Term Debt And Capital Securities Net
ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet
|
16368000000 | USD |
| CY2017 | us-gaap |
Proceeds From Issuance Of Long Term Debt And Capital Securities Net
ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet
|
5858000000 | USD |
| CY2015 | us-gaap |
Proceeds From Issuance Of Preferred Stock And Preference Stock
ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
|
0 | USD |
| CY2016 | us-gaap |
Proceeds From Issuance Of Preferred Stock And Preference Stock
ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
|
0 | USD |
| CY2017 | us-gaap |
Proceeds From Issuance Of Preferred Stock And Preference Stock
ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
|
250000000 | USD |
| CY2017 | us-gaap |
Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options
ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
|
659000000 | USD |
| CY2015 | us-gaap |
Proceeds From Minority Shareholders
ProceedsFromMinorityShareholders
|
341000000 | USD |
| CY2016 | us-gaap |
Proceeds From Minority Shareholders
ProceedsFromMinorityShareholders
|
682000000 | USD |
| CY2017 | us-gaap |
Proceeds From Minority Shareholders
ProceedsFromMinorityShareholders
|
80000000 | USD |
| CY2015 | us-gaap |
Proceeds From Payments For Other Financing Activities
ProceedsFromPaymentsForOtherFinancingActivities
|
-116000000 | USD |
| CY2016 | us-gaap |
Proceeds From Payments For Other Financing Activities
ProceedsFromPaymentsForOtherFinancingActivities
|
-512000000 | USD |
| CY2017 | us-gaap |
Proceeds From Payments For Other Financing Activities
ProceedsFromPaymentsForOtherFinancingActivities
|
-222000000 | USD |
| CY2015 | us-gaap |
Proceeds From Repayments Of Short Term Debt
ProceedsFromRepaymentsOfShortTermDebt
|
73000000 | USD |
| CY2016 | us-gaap |
Proceeds From Repayments Of Short Term Debt
ProceedsFromRepaymentsOfShortTermDebt
|
1228000000 | USD |
| CY2017 | us-gaap |
Proceeds From Repayments Of Short Term Debt
ProceedsFromRepaymentsOfShortTermDebt
|
-401000000 | USD |
| CY2015 | us-gaap |
Proceeds From Short Term Debt
ProceedsFromShortTermDebt
|
755000000 | USD |
| CY2016 | us-gaap |
Proceeds From Short Term Debt
ProceedsFromShortTermDebt
|
0 | USD |
| CY2017 | us-gaap |
Proceeds From Short Term Debt
ProceedsFromShortTermDebt
|
1259000000 | USD |
| CY2015 | us-gaap |
Proceeds From Stock Options Exercised
ProceedsFromStockOptionsExercised
|
154000000 | USD |
| CY2016 | us-gaap |
Proceeds From Stock Options Exercised
ProceedsFromStockOptionsExercised
|
448000000 | USD |
| CY2017 | us-gaap |
Proceeds From Stock Options Exercised
ProceedsFromStockOptionsExercised
|
239000000 | USD |
| CY2015 | us-gaap |
Profit Loss
ProfitLoss
|
2435000000 | USD |
| CY2016 | us-gaap |
Profit Loss
ProfitLoss
|
2529000000 | USD |
| CY2017 | us-gaap |
Profit Loss
ProfitLoss
|
926000000 | USD |
| CY2016Q4 | us-gaap |
Property Plant And Equipment Net
PropertyPlantAndEquipmentNet
|
78446000000 | USD |
| CY2017Q4 | us-gaap |
Property Plant And Equipment Net
PropertyPlantAndEquipmentNet
|
79872000000 | USD |
| CY2015 | us-gaap |
Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity
PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
|
226000000 | USD |
| CY2016 | us-gaap |
Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity
PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
|
202000000 | USD |
| CY2017 | us-gaap |
Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity
PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity
|
160000000 | USD |
| CY2016Q4 | us-gaap |
Public Utilities Property Plant And Equipment Amount Of Acquisition Adjustments1
PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
|
126000000 | USD |
| CY2017Q4 | us-gaap |
Public Utilities Property Plant And Equipment Amount Of Acquisition Adjustments1
PublicUtilitiesPropertyPlantAndEquipmentAmountOfAcquisitionAdjustments1
|
126000000 | USD |
| CY2016Q4 | us-gaap |
Public Utilities Property Plant And Equipment Distribution
PublicUtilitiesPropertyPlantAndEquipmentDistribution
|
18418000000 | USD |
| CY2017Q4 | us-gaap |
Public Utilities Property Plant And Equipment Distribution
PublicUtilitiesPropertyPlantAndEquipmentDistribution
|
19239000000 | USD |
| CY2016Q4 | us-gaap |
Public Utilities Property Plant And Equipment Generation Or Processing
PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing
|
48836000000 | USD |
| CY2017Q4 | us-gaap |
Public Utilities Property Plant And Equipment Generation Or Processing
PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing
|
51279000000 | USD |
| CY2016Q4 | us-gaap |
Public Utilities Property Plant And Equipment Other Property Plant And Equipment
PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment
|
3255000000 | USD |
| CY2017Q4 | us-gaap |
Public Utilities Property Plant And Equipment Other Property Plant And Equipment
PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment
|
3982000000 | USD |
| CY2016Q4 | us-gaap |
Public Utilities Property Plant And Equipment Plant In Service
PublicUtilitiesPropertyPlantAndEquipmentPlantInService
|
98416000000 | USD |
| CY2017Q4 | us-gaap |
Public Utilities Property Plant And Equipment Plant In Service
PublicUtilitiesPropertyPlantAndEquipmentPlantInService
|
103542000000 | USD |
| CY2016Q4 | us-gaap |
Public Utilities Property Plant And Equipment Transmission
PublicUtilitiesPropertyPlantAndEquipmentTransmission
|
11156000000 | USD |
| CY2017Q4 | us-gaap |
Public Utilities Property Plant And Equipment Transmission
PublicUtilitiesPropertyPlantAndEquipmentTransmission
|
11562000000 | USD |
| CY2016Q4 | us-gaap |
Redeemable Noncontrolling Interest Equity Carrying Amount
RedeemableNoncontrollingInterestEquityCarryingAmount
|
164000000 | USD |
| CY2017Q4 | us-gaap |
Redeemable Noncontrolling Interest Equity Carrying Amount
RedeemableNoncontrollingInterestEquityCarryingAmount
|
0 | USD |
| CY2015 | us-gaap |
Repayments Of Long Term Debt And Capital Securities
RepaymentsOfLongTermDebtAndCapitalSecurities
|
3604000000 | USD |
| CY2016 | us-gaap |
Repayments Of Long Term Debt And Capital Securities
RepaymentsOfLongTermDebtAndCapitalSecurities
|
3145000000 | USD |
| CY2017 | us-gaap |
Repayments Of Long Term Debt And Capital Securities
RepaymentsOfLongTermDebtAndCapitalSecurities
|
2930000000 | USD |
| CY2015 | us-gaap |
Repayments Of Short Term Debt
RepaymentsOfShortTermDebt
|
255000000 | USD |
| CY2016 | us-gaap |
Repayments Of Short Term Debt
RepaymentsOfShortTermDebt
|
478000000 | USD |
| CY2017 | us-gaap |
Repayments Of Short Term Debt
RepaymentsOfShortTermDebt
|
659000000 | USD |
| CY2016Q4 | us-gaap |
Retained Earnings Accumulated Deficit
RetainedEarningsAccumulatedDeficit
|
10356000000 | USD |
| CY2017Q4 | us-gaap |
Retained Earnings Accumulated Deficit
RetainedEarningsAccumulatedDeficit
|
8885000000 | USD |
| CY2015 | us-gaap |
Revenues
Revenues
|
17489000000 | USD |
| CY2016Q1 | us-gaap |
Revenues
Revenues
|
3992000000 | USD |
| CY2016Q2 | us-gaap |
Revenues
Revenues
|
4459000000 | USD |
| CY2016Q3 | us-gaap |
Revenues
Revenues
|
6264000000 | USD |
| CY2016Q4 | us-gaap |
Revenues
Revenues
|
5181000000 | USD |
| CY2016 | us-gaap |
Revenues
Revenues
|
19896000000 | USD |
| CY2017Q1 | us-gaap |
Revenues
Revenues
|
5771000000 | USD |
| CY2017Q2 | us-gaap |
Revenues
Revenues
|
5430000000 | USD |
| CY2017Q3 | us-gaap |
Revenues
Revenues
|
6201000000 | USD |
| CY2017Q4 | us-gaap |
Revenues
Revenues
|
5629000000 | USD |
| CY2017 | us-gaap |
Revenues
Revenues
|
23031000000 | USD |
| CY2016Q4 | us-gaap |
Senior Notes
SeniorNotes
|
33000000000 | USD |
| CY2017Q4 | us-gaap |
Senior Notes
SeniorNotes
|
35100000000 | USD |
| CY2016Q4 | us-gaap |
Senior Notes Current
SeniorNotesCurrent
|
1995000000 | USD |
| CY2017Q4 | us-gaap |
Senior Notes Current
SeniorNotesCurrent
|
2354000000 | USD |
| CY2015 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
|
48000000 | USD |
| CY2016 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
|
120000000 | USD |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
|
64000000 | USD |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Options Expirations In Period
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
|
0 | shares |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
|
39.90 | |
| CY2017Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
|
119000000 | USD |
| CY2016Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
|
24600000 | shares |
| CY2017Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
|
18600000 | shares |
| CY2016Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
|
41.28 | |
| CY2017Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
|
41.68 | |
| CY2017 | us-gaap |
Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price
ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
|
40.03 | |
| CY2017Q4 | us-gaap |
Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
|
0 | USD |
| CY2017 | us-gaap |
Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1
|
P0Y | |
| CY2017 | us-gaap |
Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2
|
P5Y | |
| CY2016Q4 | us-gaap |
Short Term Borrowings
ShortTermBorrowings
|
2241000000 | USD |
| CY2017Q4 | us-gaap |
Short Term Borrowings
ShortTermBorrowings
|
2439000000 | USD |
| CY2016Q4 | us-gaap |
Short Term Debt Weighted Average Interest Rate
ShortTermDebtWeightedAverageInterestRate
|
0.011 | |
| CY2017Q4 | us-gaap |
Short Term Debt Weighted Average Interest Rate
ShortTermDebtWeightedAverageInterestRate
|
0.019 | |
| CY2015 | us-gaap |
State And Local Income Tax Expense Benefit Continuing Operations
StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
|
105000000 | USD |
| CY2016 | us-gaap |
State And Local Income Tax Expense Benefit Continuing Operations
StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
|
109000000 | USD |
| CY2017 | us-gaap |
State And Local Income Tax Expense Benefit Continuing Operations
StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
|
210000000 | USD |
| CY2017 | us-gaap |
Stock Issued During Period Shares Stock Options Exercised
StockIssuedDuringPeriodSharesStockOptionsExercised
|
6000000 | shares |
| CY2015 | us-gaap |
Stock Issued During Period Value New Issues
StockIssuedDuringPeriodValueNewIssues
|
256000000 | USD |
| CY2016 | us-gaap |
Stock Issued During Period Value New Issues
StockIssuedDuringPeriodValueNewIssues
|
3758000000 | USD |
| CY2017 | us-gaap |
Stock Issued During Period Value New Issues
StockIssuedDuringPeriodValueNewIssues
|
793000000 | USD |
| CY2015 | us-gaap |
Stock Option Plan Expense
StockOptionPlanExpense
|
99000000 | USD |
| CY2016 | us-gaap |
Stock Option Plan Expense
StockOptionPlanExpense
|
121000000 | USD |
| CY2017 | us-gaap |
Stock Option Plan Expense
StockOptionPlanExpense
|
109000000 | USD |
| CY2015 | us-gaap |
Stock Redeemed Or Called During Period Value
StockRedeemedOrCalledDuringPeriodValue
|
150000000 | USD |
| CY2017 | us-gaap |
Stock Redeemed Or Called During Period Value
StockRedeemedOrCalledDuringPeriodValue
|
609000000 | USD |
| CY2015 | us-gaap |
Stock Repurchased During Period Value
StockRepurchasedDuringPeriodValue
|
115000000 | USD |
| CY2016Q4 | us-gaap |
Stockholders Equity
StockholdersEquity
|
24758000000 | USD |
| CY2017Q4 | us-gaap |
Stockholders Equity
StockholdersEquity
|
24167000000 | USD |
| CY2014Q4 | us-gaap |
Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
|
20926000000 | USD |
| CY2015Q4 | us-gaap |
Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
|
21982000000 | USD |
| CY2016Q2 | us-gaap |
Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
|
8001000000 | USD |
| CY2016Q4 | us-gaap |
Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
|
26612000000 | USD |
| CY2017Q4 | us-gaap |
Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
|
25528000000 | USD |
| CY2015 | us-gaap |
Stockholders Equity Other
StockholdersEquityOther
|
2000000 | USD |
| CY2016 | us-gaap |
Stockholders Equity Other
StockholdersEquityOther
|
6000000 | USD |
| CY2017 | us-gaap |
Stockholders Equity Other
StockholdersEquityOther
|
21000000 | USD |
| CY2017Q4 | us-gaap |
Tax Credit Carryforward Amount
TaxCreditCarryforwardAmount
|
2100000000 | USD |
| CY2015 | us-gaap |
Taxes Excluding Income And Excise Taxes
TaxesExcludingIncomeAndExciseTaxes
|
997000000 | USD |
| CY2016 | us-gaap |
Taxes Excluding Income And Excise Taxes
TaxesExcludingIncomeAndExciseTaxes
|
1113000000 | USD |
| CY2017 | us-gaap |
Taxes Excluding Income And Excise Taxes
TaxesExcludingIncomeAndExciseTaxes
|
1250000000 | USD |
| CY2016Q4 | us-gaap |
Temporary Equity Carrying Amount Attributable To Parent
TemporaryEquityCarryingAmountAttributableToParent
|
118000000 | USD |
| CY2017Q4 | us-gaap |
Temporary Equity Carrying Amount Attributable To Parent
TemporaryEquityCarryingAmountAttributableToParent
|
324000000 | USD |
| CY2016Q4 | us-gaap |
Treasury Stock Shares
TreasuryStockShares
|
800000 | shares |
| CY2017Q4 | us-gaap |
Treasury Stock Shares
TreasuryStockShares
|
900000 | shares |
| CY2016Q4 | us-gaap |
Treasury Stock Value
TreasuryStockValue
|
31000000 | USD |
| CY2017Q4 | us-gaap |
Treasury Stock Value
TreasuryStockValue
|
36000000 | USD |
| CY2016Q4 | us-gaap |
Unamortized Debt Issuance Expense
UnamortizedDebtIssuanceExpense
|
213000000 | USD |
| CY2017Q4 | us-gaap |
Unamortized Debt Issuance Expense
UnamortizedDebtIssuanceExpense
|
226000000 | USD |
| CY2016Q4 | us-gaap |
Unamortized Loss Reacquired Debt Noncurrent
UnamortizedLossReacquiredDebtNoncurrent
|
223000000 | USD |
| CY2017Q4 | us-gaap |
Unamortized Loss Reacquired Debt Noncurrent
UnamortizedLossReacquiredDebtNoncurrent
|
206000000 | USD |
| CY2014Q4 | us-gaap |
Unrecognized Tax Benefits
UnrecognizedTaxBenefits
|
170000000 | USD |
| CY2015Q4 | us-gaap |
Unrecognized Tax Benefits
UnrecognizedTaxBenefits
|
433000000 | USD |
| CY2016Q4 | us-gaap |
Unrecognized Tax Benefits
UnrecognizedTaxBenefits
|
484000000 | USD |
| CY2017Q4 | us-gaap |
Unrecognized Tax Benefits
UnrecognizedTaxBenefits
|
18000000 | USD |
| CY2015 | us-gaap |
Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
|
20000000 | USD |
| CY2016 | us-gaap |
Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
|
15000000 | USD |
| CY2017 | us-gaap |
Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
|
196000000 | USD |
| CY2015 | us-gaap |
Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities
UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
|
0 | USD |
| CY2016 | us-gaap |
Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities
UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
|
0 | USD |
| CY2017 | us-gaap |
Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities
UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
|
290000000 | USD |
| CY2015 | us-gaap |
Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
|
43000000 | USD |
| CY2016 | us-gaap |
Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
|
45000000 | USD |
| CY2017 | us-gaap |
Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
|
10000000 | USD |
| CY2015 | us-gaap |
Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
|
240000000 | USD |
| CY2016 | us-gaap |
Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
|
21000000 | USD |
| CY2017 | us-gaap |
Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
|
10000000 | USD |
| CY2015Q4 | us-gaap |
Unrecognized Tax Benefits That Would Impact Effective Tax Rate
UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
|
10000000 | USD |
| CY2016Q4 | us-gaap |
Unrecognized Tax Benefits That Would Impact Effective Tax Rate
UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
|
20000000 | USD |
| CY2017Q4 | us-gaap |
Unrecognized Tax Benefits That Would Impact Effective Tax Rate
UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
|
18000000 | USD |
| CY2015 | us-gaap |
Utilities Operating Expense Fuel Used
UtilitiesOperatingExpenseFuelUsed
|
4750000000 | USD |
| CY2016 | us-gaap |
Utilities Operating Expense Fuel Used
UtilitiesOperatingExpenseFuelUsed
|
4361000000 | USD |
| CY2017 | us-gaap |
Utilities Operating Expense Fuel Used
UtilitiesOperatingExpenseFuelUsed
|
4400000000 | USD |
| CY2015 | us-gaap |
Utilities Operating Expense Maintenance And Operations
UtilitiesOperatingExpenseMaintenanceAndOperations
|
4416000000 | USD |
| CY2016 | us-gaap |
Utilities Operating Expense Maintenance And Operations
UtilitiesOperatingExpenseMaintenanceAndOperations
|
5240000000 | USD |
| CY2017 | us-gaap |
Utilities Operating Expense Maintenance And Operations
UtilitiesOperatingExpenseMaintenanceAndOperations
|
5481000000 | USD |
| CY2015 | us-gaap |
Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
|
914000000 | shares |
| CY2016 | us-gaap |
Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
|
958000000 | shares |
| CY2017 | us-gaap |
Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
|
1008000000 | shares |
| CY2015 | us-gaap |
Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
|
910000000 | shares |
| CY2016 | us-gaap |
Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
|
951000000 | shares |
| CY2017 | us-gaap |
Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
|
1000000000 | shares |
| CY2017 | us-gaap |
Property Plant And Equipment Preproduction Design And Development Costs
PropertyPlantAndEquipmentPreproductionDesignAndDevelopmentCosts
|
<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Development Costs</font></div><div style="line-height:120%;padding-top:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Company capitalizes development costs once a project is probable of completion, primarily based on a review of its economics and operational feasibility, as well as status of power off-take agreements and regulatory approvals, if applicable. Capitalized development costs are included in construction work in progress on the consolidated balance sheets. All development costs incurred prior to the determination that a project is probable of completion are expensed as incurred and included in other operations and maintenance expense in the consolidated statements of income. If it is determined that a project is no longer probable of completion, any capitalized development costs are expensed and included in other operations and maintenance expense in the consolidated statements of income.</font></div></div> |
