$DTE
DTE ENERGY CO Stock $dte

$dte Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000093634018000082 Filed on February 16, 2018

Income Statement

Concept	2017 Q4	2017 Q3	2017 Q2
Revenue	$3.271B	$3.245B	$2.855B
YoY Change	13.81%	10.83%	26.22%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$274.0M	$258.0M	$249.0M
YoY Change	0.0%	12.17%	2.47%
% of Gross Profit
Operating Expenses	$3.020B	$2.795B	$2.517B
YoY Change	16.6%	18.33%	25.98%
Operating Profit	$372.0M	$434.0M	$320.0M
YoY Change	23.59%	-14.4%	25.0%
Interest Expense	$24.00M	$146.0M	$133.0M
YoY Change	-123.3%	28.07%	16.67%
% of Operating Profit	6.45%	33.64%	41.56%
Other Income/Expense, Net	-$29.00M	-$97.00M	-$88.00M
YoY Change	38.1%	34.72%	44.26%
Pretax Income	$214.0M	$337.0M	$232.0M
YoY Change	40.79%	-22.53%	18.97%
Income Tax	$39.00M	$74.00M	$57.00M
% Of Pretax Income	18.22%	21.96%	24.57%
Net Earnings	$287.0M	$270.0M	$177.0M
YoY Change	119.08%	-20.12%	16.45%
Net Earnings / Revenue	8.77%	8.32%	6.2%
Basic Earnings Per Share	$1.60	$1.51	$0.99
Diluted Earnings Per Share	$1.60	$1.51	$0.99
COMMON SHARES
Basic Shares Outstanding		179.0M shares	179.0M shares
Diluted Shares Outstanding		179.0M shares	179.0M shares

Balance Sheet

Concept	2017 Q4	2017 Q3	2017 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$66.00M	$63.00M	$62.00M
YoY Change	-28.26%	-4.55%	93.75%
Cash & Equivalents	$66.00M	$63.00M	$62.00M
Short-Term Investments
Other Short-Term Assets	$199.0M	$270.0M	$168.0M
YoY Change	2.05%	112.6%	4.35%
Inventory	$779.0M	$816.0M	$743.0M
Prepaid Expenses
Receivables	$1.758B	$1.395B	$1.451B
Other Receivables	$98.00M	$166.0M	$92.00M
Total Short-Term Assets	$3.081B	$2.815B	$2.631B
YoY Change	11.55%	8.48%	16.52%
LONG-TERM ASSETS
Property, Plant & Equipment	$20.72B	$20.31B	$20.06B
YoY Change	5.02%	9.47%	9.66%
Goodwill	$2.293B	$2.293B	$2.291B
YoY Change	0.31%	13.63%	13.53%
Intangibles	$867.0M
YoY Change	2.97%
Long-Term Investments	$1.073B	$971.0M	$941.0M
YoY Change	42.69%	37.54%	48.66%
Other Assets	$161.0M	$175.0M	$168.0M
YoY Change	-5.29%	0.0%	5.66%
Total Long-Term Assets	$7.168B	$7.315B	$7.338B
YoY Change	-1.48%	20.1%	20.0%
TOTAL ASSETS
Total Short-Term Assets	$3.081B	$2.815B	$2.631B
Total Long-Term Assets	$7.168B	$7.315B	$7.338B
Total Assets	$33.77B	$33.07B	$32.58B
YoY Change	5.39%	12.25%	13.25%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$1.171B	$994.0M	$988.0M
YoY Change	8.53%	22.26%	32.62%
Accrued Expenses	$111.0M	$131.0M	$105.0M
YoY Change	15.63%	13.91%	15.38%
Deferred Revenue
YoY Change
Short-Term Debt	$621.0M	$659.0M	$420.0M
YoY Change	24.45%	60.73%	140.0%
Long-Term Debt Due	$109.0M	$109.0M	$412.0M
YoY Change	678.57%	626.67%	149.7%
Total Short-Term Liabilities	$2.812B	$2.598B	$2.747B
YoY Change	15.39%	31.95%	45.88%
LONG-TERM LIABILITIES
Long-Term Debt	$11.04B	$11.04B	$10.60B
YoY Change	5.07%	27.0%	23.96%
Other Long-Term Liabilities	$323.0M	$325.0M	$339.0M
YoY Change	-7.45%	33.74%	50.0%
Total Long-Term Liabilities	$8.780B	$8.825B	$8.906B
YoY Change	-0.63%	-0.46%	1.85%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.812B	$2.598B	$2.747B
Total Long-Term Liabilities	$8.780B	$8.825B	$8.906B
Total Liabilities	$11.59B	$11.42B	$11.65B
YoY Change	2.83%	5.43%	9.65%
SHAREHOLDERS EQUITY
Retained Earnings	$5.643B	$5.515B	$5.245B
YoY Change	10.34%	7.48%	9.48%
Common Stock	$3.989B	$3.978B	$3.968B
YoY Change	-1.02%	-3.84%	-3.9%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$9.512B	$9.373B	$9.088B
YoY Change
Total Liabilities & Shareholders Equity	$33.77B	$33.07B	$32.58B
YoY Change	5.39%	12.25%	13.25%

Cashflow Statement

Concept	2017 Q4	2017 Q3	2017 Q2
OPERATING ACTIVITIES
Net Income	$287.0M	$270.0M	$177.0M
YoY Change	119.08%	-20.12%	16.45%
Depreciation, Depletion And Amortization	$274.0M	$258.0M	$249.0M
YoY Change	0.0%	12.17%	2.47%
Cash From Operating Activities	$567.0M	$367.0M	$396.0M
YoY Change	78.86%	-25.25%	-25.42%
INVESTING ACTIVITIES
Capital Expenditures	-$678.0M	-$536.0M	-$481.0M
YoY Change	-3.56%	11.43%	10.07%
Acquisitions
YoY Change
Other Investing Activities	-$84.00M	-$18.00M	-$125.0M
YoY Change	-92.89%	-78.57%	95.31%
Cash From Investing Activities	-$762.0M	-$554.0M	-$606.0M
YoY Change	-59.58%	-1.95%	20.96%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	196.0M	189.0M	192.0M
YoY Change	-87.7%	75.0%	-681.82%
NET CHANGE
Cash From Operating Activities	567.0M	367.0M	396.0M
Cash From Investing Activities	-762.0M	-554.0M	-606.0M
Cash From Financing Activities	196.0M	189.0M	192.0M
Net Change In Cash	1.000M	2.000M	-18.00M
YoY Change	-96.15%	-94.12%	500.0%
FREE CASH FLOW
Cash From Operating Activities	$567.0M	$367.0M	$396.0M
Capital Expenditures	-$678.0M	-$536.0M	-$481.0M
Free Cash Flow	$1.245B	$903.0M	$877.0M
YoY Change	22.06%	-7.1%	-9.4%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	179385962	shares
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017Q2	dei	Entity Public Float EntityPublicFloat	18700000000	USD
CY2017	dei	Entity Registrant Name EntityRegistrantName	DTE ENERGY CO
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2016	dte	Adjustmentsto Additional Paidin Capital Financial Instruments Subjectto Mandatory Redemption Issuance Cost AdjustmentstoAdditionalPaidinCapitalFinancialInstrumentsSubjecttoMandatoryRedemptionIssuanceCost	18000000	USD
CY2016	dte	Adjustmentsto Additional Paidin Capital Premiumon Financial Instruments Subjectto Mandatory Redemption AdjustmentstoAdditionalPaidinCapitalPremiumonFinancialInstrumentsSubjecttoMandatoryRedemption	98000000	USD
CY2015	dte	Allocated Sharebased Compensation Expense Equityand Liability AllocatedSharebasedCompensationExpenseEquityandLiability	34000000	USD
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	0000936340
CY2017	dei	Amendment Flag AmendmentFlag	false
CY2016	dte	Allocated Sharebased Compensation Expense Equityand Liability AllocatedSharebasedCompensationExpenseEquityandLiability	61000000	USD
CY2017	dte	Allocated Sharebased Compensation Expense Equityand Liability AllocatedSharebasedCompensationExpenseEquityandLiability	58000000	USD
CY2015	dte	Amortizationof Securitized Regulatory Asset AmortizationofSecuritizedRegulatoryAsset	-38000000	USD
CY2016	dte	Amortizationof Securitized Regulatory Asset AmortizationofSecuritizedRegulatoryAsset	0	USD
CY2017	dte	Amortizationof Securitized Regulatory Asset AmortizationofSecuritizedRegulatoryAsset	0	USD
CY2016	dte	Capitalized Interest Costs Including Allowancefor Debt Funds Used During Construction CapitalizedInterestCostsIncludingAllowanceforDebtFundsUsedDuringConstruction	10000000	USD
CY2017	dte	Capitalized Interest Costs Including Allowancefor Debt Funds Used During Construction CapitalizedInterestCostsIncludingAllowanceforDebtFundsUsedDuringConstruction	13000000	USD
CY2016	dte	Capitalized Interest Costs Including Allowancefor Equity Funds Used During Construction CapitalizedInterestCostsIncludingAllowanceforEquityFundsUsedDuringConstruction	21000000	USD
CY2017	dte	Capitalized Interest Costs Including Allowancefor Equity Funds Used During Construction CapitalizedInterestCostsIncludingAllowanceforEquityFundsUsedDuringConstruction	23000000	USD
CY2016Q4	dte	Cash Collateral Posted Net Of Cash Collateral Received CashCollateralPostedNetOfCashCollateralReceived	34000000	USD
CY2017Q4	dte	Cash Collateral Posted Net Of Cash Collateral Received CashCollateralPostedNetOfCashCollateralReceived	28000000	USD
CY2016Q4	dte	Cashcollateralpaidnotrelatedtounrealizedderivativepositions Cashcollateralpaidnotrelatedtounrealizedderivativepositions	18000000	USD
CY2017Q4	dte	Cashcollateralpaidnotrelatedtounrealizedderivativepositions Cashcollateralpaidnotrelatedtounrealizedderivativepositions	18000000	USD
CY2016Q4	dte	Cashcollateralreceivednotrelatedtounrealizedderivativepositions Cashcollateralreceivednotrelatedtounrealizedderivativepositions	5000000	USD
CY2017Q4	dte	Cashcollateralreceivednotrelatedtounrealizedderivativepositions Cashcollateralreceivednotrelatedtounrealizedderivativepositions	3000000	USD
CY2015	dte	Charitable Contributions CharitableContributions	12000000	USD
CY2016	dte	Charitable Contributions CharitableContributions	26000000	USD
CY2017	dte	Charitable Contributions CharitableContributions	43000000	USD
CY2017	dte	Deferral Of Investigation And Remediation Of Costs Associated With Gas Utilities Former Mgp Sites DeferralOfInvestigationAndRemediationOfCostsAssociatedWithGasUtilitiesFormerMgpSites	P10Y
CY2017	dte	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax Refundable Period DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTaxRefundablePeriod	P4Y
CY2016Q4	dte	Deferred Tax Liability Netof Valuation Allowance DeferredTaxLiabilityNetofValuationAllowance	5625000000	USD
CY2017Q4	dte	Deferred Tax Liability Netof Valuation Allowance DeferredTaxLiabilityNetofValuationAllowance	3702000000	USD
CY2016Q4	dte	Deferred Tax Liability Pensionand Benefits DeferredTaxLiabilityPensionandBenefits	-643000000	USD
CY2017Q4	dte	Deferred Tax Liability Pensionand Benefits DeferredTaxLiabilityPensionandBenefits	-334000000	USD
CY2017Q4	dte	Derivative Net Asset Position Aggregate Fair Value DerivativeNetAssetPositionAggregateFairValue	468000000	USD
CY2010	dte	Epa Sulfur Dioxide Ambient Air Quality Standard EPASulfurDioxideAmbientAirQualityStandard	PT1H
CY2015	dte	Effective Income Tax Rate Reconciliation Subsidiary Earnings Loss EffectiveIncomeTaxRateReconciliationSubsidiaryEarningsLoss	0	USD
CY2016	dte	Effective Income Tax Rate Reconciliation Subsidiary Earnings Loss EffectiveIncomeTaxRateReconciliationSubsidiaryEarningsLoss	10000000	USD
CY2017	dte	Effective Income Tax Rate Reconciliation Subsidiary Earnings Loss EffectiveIncomeTaxRateReconciliationSubsidiaryEarningsLoss	0	USD
CY2015	dte	Employee Service Sharebased Compensation Allocationof Recognized Period Costs Liabilityand Equity Capitalized Amount EmployeeServiceSharebasedCompensationAllocationofRecognizedPeriodCostsLiabilityandEquityCapitalizedAmount	5000000	USD
CY2016	dte	Employee Service Sharebased Compensation Allocationof Recognized Period Costs Liabilityand Equity Capitalized Amount EmployeeServiceSharebasedCompensationAllocationofRecognizedPeriodCostsLiabilityandEquityCapitalizedAmount	10000000	USD
CY2017	dte	Employee Service Sharebased Compensation Allocationof Recognized Period Costs Liabilityand Equity Capitalized Amount EmployeeServiceSharebasedCompensationAllocationofRecognizedPeriodCostsLiabilityandEquityCapitalizedAmount	9000000	USD
CY2015	dte	Employee Service Sharebased Compensation Equityand Liability Tax EmployeeServiceSharebasedCompensationEquityandLiabilityTax	13000000	USD
CY2016	dte	Employee Service Sharebased Compensation Equityand Liability Tax EmployeeServiceSharebasedCompensationEquityandLiabilityTax	24000000	USD
CY2017	dte	Employee Service Sharebased Compensation Equityand Liability Tax EmployeeServiceSharebasedCompensationEquityandLiabilityTax	23000000	USD
CY2016Q4	dte	Equity Units Percentage Interestin Attached Debt Instrument EquityUnitsPercentageInterestinAttachedDebtInstrument	0.00005
CY2017Q4	dte	Estimated Future Capital Expenditures For Next Year EstimatedFutureCapitalExpendituresForNextYear	3600000000	USD
CY2015	dte	Gain Losson Saleof Assetsand Asset Impairment Chargesnet GainLossonSaleofAssetsandAssetImpairmentChargesnet	-107000000	USD
CY2016	dte	Gain Losson Saleof Assetsand Asset Impairment Chargesnet GainLossonSaleofAssetsandAssetImpairmentChargesnet	-8000000	USD
CY2017	dte	Gain Losson Saleof Assetsand Asset Impairment Chargesnet GainLossonSaleofAssetsandAssetImpairmentChargesnet	-38000000	USD
CY2015	dte	Income Tax Expense Benefitincluding Discontinued Operations IncomeTaxExpenseBenefitincludingDiscontinuedOperations	230000000	USD
CY2016	dte	Income Tax Expense Benefitincluding Discontinued Operations IncomeTaxExpenseBenefitincludingDiscontinuedOperations	271000000	USD
CY2017	dte	Income Tax Expense Benefitincluding Discontinued Operations IncomeTaxExpenseBenefitincludingDiscontinuedOperations	175000000	USD
CY2015	dte	Incomefrom Re Finvestees IncomefromREFinvestees	83000000	USD
CY2016	dte	Incomefrom Re Finvestees IncomefromREFinvestees	75000000	USD
CY2017	dte	Incomefrom Re Finvestees IncomefromREFinvestees	77000000	USD
CY2015	dte	Incomeon Contract Services IncomeonContractServices	27000000	USD
CY2016	dte	Incomeon Contract Services IncomeonContractServices	21000000	USD
CY2017	dte	Incomeon Contract Services IncomeonContractServices	19000000	USD
CY2017Q4	dte	Jointly Owned Utility Plant Number Of Plants JointlyOwnedUtilityPlantNumberOfPlants	2	plant
CY2016Q4	dte	Lettersof Credit Issuedthatcouldbeusedtooffsetnetderivativeliabilities LettersofCreditIssuedthatcouldbeusedtooffsetnetderivativeliabilities	2000000	USD
CY2017Q4	dte	Lettersof Credit Issuedthatcouldbeusedtooffsetnetderivativeliabilities LettersofCreditIssuedthatcouldbeusedtooffsetnetderivativeliabilities	4000000	USD
CY2016Q4	dte	Lettersof Credit Received Usedto Offset Net Derivative Assets LettersofCreditReceivedUsedtoOffsetNetDerivativeAssets	2000000	USD
CY2017Q4	dte	Lettersof Credit Received Usedto Offset Net Derivative Assets LettersofCreditReceivedUsedtoOffsetNetDerivativeAssets	4000000	USD
CY2017Q4	dte	Numberof Gas Utility Customers NumberofGasUtilityCustomers	1300000	customer
CY2017Q4	dte	Lineof Credit Facility Dividend Restrictions Amount LineofCreditFacilityDividendRestrictionsAmount	1800000000	USD
CY2015	dte	Nuclearfuelamortization Nuclearfuelamortization	46000000	USD
CY2016	dte	Nuclearfuelamortization Nuclearfuelamortization	58000000	USD
CY2017	dte	Nuclearfuelamortization Nuclearfuelamortization	53000000	USD
CY2017Q4	dte	Numberof Electric Utility Customers NumberofElectricUtilityCustomers	2200000	customer
CY2015	dte	Other Miscellaneous Nonoperating Income OtherMiscellaneousNonoperatingIncome	11000000	USD
CY2016	dte	Other Miscellaneous Nonoperating Income OtherMiscellaneousNonoperatingIncome	7000000	USD
CY2017	dte	Other Miscellaneous Nonoperating Income OtherMiscellaneousNonoperatingIncome	21000000	USD
CY2017Q4	dte	Other Restrictionson Paymentof Dividends Amount OtherRestrictionsonPaymentofDividendsAmount	0	USD
CY2015	dte	Paymentsto Acquire Productive Assets Including Paymentsto Acquire Businesses Netof Cash Acquired PaymentstoAcquireProductiveAssetsIncludingPaymentstoAcquireBusinessesNetofCashAcquired	2261000000	USD
CY2016	dte	Paymentsto Acquire Productive Assets Including Paymentsto Acquire Businesses Netof Cash Acquired PaymentstoAcquireProductiveAssetsIncludingPaymentstoAcquireBusinessesNetofCashAcquired	3269000000	USD
CY2017	dte	Paymentsto Acquire Productive Assets Including Paymentsto Acquire Businesses Netof Cash Acquired PaymentstoAcquireProductiveAssetsIncludingPaymentstoAcquireBusinessesNetofCashAcquired	2250000000	USD
CY2017	dte	Performance Units Price Per Unit PerformanceUnitsPricePerUnit	1.00
CY2015	dte	Plant And Equipment Expenditures Non Utility PlantAndEquipmentExpendituresNonUtility	203000000	USD
CY2016	dte	Plant And Equipment Expenditures Non Utility PlantAndEquipmentExpendituresNonUtility	147000000	USD
CY2017	dte	Plant And Equipment Expenditures Non Utility PlantAndEquipmentExpendituresNonUtility	213000000	USD
CY2015	dte	Plant And Equipment Expenditures Utility PlantAndEquipmentExpendituresUtility	1817000000	USD
CY2016	dte	Plant And Equipment Expenditures Utility PlantAndEquipmentExpendituresUtility	1898000000	USD
CY2017	dte	Plant And Equipment Expenditures Utility PlantAndEquipmentExpendituresUtility	2037000000	USD
CY2015	dte	Premiumon Financial Instruments Subjectto Mandatory Redemption PremiumonFinancialInstrumentsSubjecttoMandatoryRedemption	0	USD
CY2016	dte	Premiumon Financial Instruments Subjectto Mandatory Redemption PremiumonFinancialInstrumentsSubjecttoMandatoryRedemption	98000000	USD
CY2017	dte	Premiumon Financial Instruments Subjectto Mandatory Redemption PremiumonFinancialInstrumentsSubjecttoMandatoryRedemption	0	USD
CY2017	dte	Property Maintenance Accrual Period PropertyMaintenanceAccrualPeriod	P18M
CY2015	dte	Regulated Operating Expense Fuel Used Purchased Power Gas RegulatedOperatingExpenseFuelUsedPurchasedPowerGas	2081000000	USD
CY2016	dte	Regulated Operating Expense Fuel Used Purchased Power Gas RegulatedOperatingExpenseFuelUsedPurchasedPowerGas	1968000000	USD
CY2017	dte	Regulated Operating Expense Fuel Used Purchased Power Gas RegulatedOperatingExpenseFuelUsedPurchasedPowerGas	1881000000	USD
CY2017Q4	dte	Remainingamountofoffsetstoderivativenetliabilitypositionsforhardandsofttriggerprovisions Remainingamountofoffsetstoderivativenetliabilitypositionsforhardandsofttriggerprovisions	67000000	USD
CY2015	dte	Repaymentof Secured Tax Exempt Debt RepaymentofSecuredTaxExemptDebt	0	USD
CY2016	dte	Repaymentof Secured Tax Exempt Debt RepaymentofSecuredTaxExemptDebt	59000000	USD
CY2017	dte	Repaymentof Secured Tax Exempt Debt RepaymentofSecuredTaxExemptDebt	0	USD
CY2017	dte	Specific Review Of Probable Future Collections Based On Receivable Balances In Excess Of90 Days SpecificReviewOfProbableFutureCollectionsBasedOnReceivableBalancesInExcessOf90Days	P30D
CY2017	dte	Tax Cutsand Jobs Actof2017 Incomplete Accounting Changein Tax Rate Deferred Tax Liability Provisional Income Tax Expense Benefit TaxCutsandJobsActof2017IncompleteAccountingChangeinTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit	-2560000000	USD
CY2015	dte	Unregulated Operating Expense Fuel Used Purchased Power Gas UnregulatedOperatingExpenseFuelUsedPurchasedPowerGas	3481000000	USD
CY2016	dte	Unregulated Operating Expense Fuel Used Purchased Power Gas UnregulatedOperatingExpenseFuelUsedPurchasedPowerGas	3562000000	USD
CY2017	dte	Unregulated Operating Expense Fuel Used Purchased Power Gas UnregulatedOperatingExpenseFuelUsedPurchasedPowerGas	5283000000	USD
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	1079000000	USD
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	1171000000	USD
CY2016Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1522000000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1758000000	USD
CY2016Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	93000000	USD
CY2017Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	122000000	USD
CY2016Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	10299000000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	10703000000	USD
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-133000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-120000000	USD
CY2017Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	456000000	USD
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	41000000	USD
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	49000000	USD
CY2015	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	11000000	USD
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	16000000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	29000000	USD
CY2015	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	150000000	USD
CY2016	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	193000000	USD
CY2017	us-gaap	Amortization Of Regulatory Asset AmortizationOfRegulatoryAsset	165000000	USD
CY2016	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	7100000	shares
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	6000000	shares
CY2016Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	2197000000	USD
CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	2320000000	USD
CY2017	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	131000000	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	2000000	USD
CY2017	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	6000000	USD
CY2017	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-4000000	USD
CY2016Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	2197000000	USD
CY2017Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	2320000000	USD
CY2015Q4	us-gaap	Assets Assets	28662000000	USD
CY2016Q4	us-gaap	Assets Assets	32041000000	USD
CY2017Q4	us-gaap	Assets Assets	33767000000	USD
CY2016Q4	us-gaap	Assets Current AssetsCurrent	2762000000	USD
CY2017Q4	us-gaap	Assets Current AssetsCurrent	3081000000	USD
CY2016Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	7276000000	USD
CY2017Q4	us-gaap	Assets Noncurrent AssetsNoncurrent	7168000000	USD
CY2015	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	207000000	USD
CY2016	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	312000000	USD
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	295000000	USD
CY2016Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	7000000	USD
CY2017Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	1000000	USD
CY2016Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	44000000	USD
CY2017Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	44000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Receivable CapitalLeasesFutureMinimumPaymentsReceivable	33000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Receivable Current CapitalLeasesFutureMinimumPaymentsReceivableCurrent	13000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Receivable Due Thereafter CapitalLeasesFutureMinimumPaymentsReceivableDueThereafter	1000000	USD
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CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Receivable In Four Years CapitalLeasesFutureMinimumPaymentsReceivableInFourYears	0	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Receivable In Three Years CapitalLeasesFutureMinimumPaymentsReceivableInThreeYears	9000000	USD
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Receivable In Two Years CapitalLeasesFutureMinimumPaymentsReceivableInTwoYears	10000000	USD
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CY2017Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	38000000	USD
CY2017Q4	us-gaap	Capital Leases Lessor Balance Sheet Net Investment In Direct Financing Leases Current CapitalLeasesLessorBalanceSheetNetInvestmentInDirectFinancingLeasesCurrent	7000000	USD
CY2017Q4	us-gaap	Capital Leases Lessor Balance Sheet Net Investment In Direct Financing Leases Noncurrent CapitalLeasesLessorBalanceSheetNetInvestmentInDirectFinancingLeasesNoncurrent	51000000	USD
CY2017Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases CapitalLeasesNetInvestmentInDirectFinancingLeases	58000000	USD
CY2017Q4	us-gaap	Capital Leases Net Investment In Direct Financing Leases Deferred Income CapitalLeasesNetInvestmentInDirectFinancingLeasesDeferredIncome	15000000	USD
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CY2016Q4	us-gaap	Capitalized Computer Software Accumulated Amortization CapitalizedComputerSoftwareAccumulatedAmortization	435000000	USD
CY2017Q4	us-gaap	Capitalized Computer Software Accumulated Amortization CapitalizedComputerSoftwareAccumulatedAmortization	500000000	USD
CY2015	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	98000000	USD
CY2016	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	89000000	USD
CY2017	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	101000000	USD
CY2016Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	715000000	USD
CY2017Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	890000000	USD
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	48000000	USD
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	37000000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	92000000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	66000000	USD
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CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	55000000	USD
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-26000000	USD
CY2017Q4	us-gaap	Collateral Already Posted Aggregate Fair Value CollateralAlreadyPostedAggregateFairValue	0	USD
CY2016Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
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CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.06
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	3.36
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2016Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	179432581	shares
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	179386967	shares
CY2016Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	179432581	shares
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	179386967	shares
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	4030000000	USD
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	3989000000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	737000000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	880000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1147000000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-7000000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-34000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-22000000	USD
CY2015	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	730000000	USD
CY2016	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	846000000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1125000000	USD
CY2015	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	852000000	USD
CY2016	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	976000000	USD
CY2017	us-gaap	Cost Of Services Depreciation And Amortization CostOfServicesDepreciationAndAmortization	1030000000	USD
CY2015	us-gaap	Costs And Expenses CostsAndExpenses	9098000000	USD
CY2016	us-gaap	Costs And Expenses CostsAndExpenses	9185000000	USD
CY2017	us-gaap	Costs And Expenses CostsAndExpenses	10961000000	USD
CY2015Q4	us-gaap	Cumulative Effect Of New Accounting Principle In Period Of Adoption CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	3000000	USD
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-3000000	USD
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-1000000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-22000000	USD
CY2015	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-7000000	USD
CY2016	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	6000000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-21000000	USD
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-4000000	USD
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	7000000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1000000	USD
CY2017Q4	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	1420000000	USD
CY2016Q4	us-gaap	Decommissioning Fund Investments DecommissioningFundInvestments	1320000000	USD
CY2017Q4	us-gaap	Decommissioning Fund Investments DecommissioningFundInvestments	1492000000	USD
CY2016Q4	us-gaap	Decommissioning Liability Noncurrent DecommissioningLiabilityNoncurrent	194000000	USD
CY2017Q4	us-gaap	Decommissioning Liability Noncurrent DecommissioningLiabilityNoncurrent	220000000	USD
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	178000000	USD
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	184000000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	118000000	USD
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	237000000	USD
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	265000000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	196000000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	4126000000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	1848000000	USD
CY2016Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	4162000000	USD
CY2017Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	1888000000	USD
CY2015	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	237000000	USD
CY2016	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	265000000	USD
CY2017	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	196000000	USD
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	59000000	USD
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	81000000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	78000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1463000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	1814000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	190000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	83000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	59000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	70000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	643000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	947000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	307000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards General Business DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	640000000	USD
CY2016Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	36000000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	40000000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	4162000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1888000000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	119000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	82000000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	-217000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	-170000000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	4880000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	3276000000	USD
CY2016Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	879000000	USD
CY2017Q4	us-gaap	Deferred Tax Liabilities Regulatory Assets And Liabilities DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities	94000000	USD
CY2016Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	1152000000	USD
CY2017Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	924000000	USD
CY2015Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.0450
CY2015	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	49000000	USD
CY2016	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	51000000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	57000000	USD
CY2017	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	0.04
CY2015	us-gaap	Depreciation Depreciation	740000000	USD
CY2016	us-gaap	Depreciation Depreciation	783000000	USD
CY2017	us-gaap	Depreciation Depreciation	865000000	USD
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	852000000	USD
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	976000000	USD
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1030000000	USD
CY2016Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	7000000	USD
CY2017Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	9000000	USD
CY2016Q4	us-gaap	Derivative Asset Fair Value Gross Liability And Obligation To Return Cash Offset DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset	468000000	USD
CY2017Q4	us-gaap	Derivative Asset Fair Value Gross Liability And Obligation To Return Cash Offset DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset	498000000	USD
CY2016Q4	us-gaap	Derivative Assets DerivativeAssets	81000000	USD
CY2017Q4	us-gaap	Derivative Assets DerivativeAssets	154000000	USD
CY2016Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	47000000	USD
CY2017Q4	us-gaap	Derivative Assets Current DerivativeAssetsCurrent	103000000	USD
CY2016Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	34000000	USD
CY2017Q4	us-gaap	Derivative Assets Noncurrent DerivativeAssetsNoncurrent	51000000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	549000000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	652000000	USD
CY2016Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	656000000	USD
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	657000000	USD
CY2016	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	-109000000	USD
CY2017	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	128000000	USD
CY2016Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	167000000	USD
CY2017Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	146000000	USD
CY2016Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	69000000	USD
CY2017Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	99000000	USD
CY2016Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	98000000	USD
CY2017Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	47000000	USD
CY2016Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	28000000	USD
CY2017Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	22000000	USD
CY2016Q4	us-gaap	Derivative Liability Fair Value Gross Asset And Right To Reclaim Cash Offset DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset	489000000	USD
CY2017Q4	us-gaap	Derivative Liability Fair Value Gross Asset And Right To Reclaim Cash Offset DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset	511000000	USD
CY2017Q4	us-gaap	Derivative Net Liability Position Aggregate Fair Value DerivativeNetLiabilityPositionAggregateFairValue	535000000	USD
CY2015	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	510000000	USD
CY2016	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	548000000	USD
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	602000000	USD
CY2016Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	148000000	USD
CY2017Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	158000000	USD
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.05
CY2016Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.38
CY2016Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.84
CY2016Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.88
CY2016Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.73
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.84
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.23
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.99
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.51
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.60
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.32
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.05
CY2016Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.37
CY2016Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.84
CY2016Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.88
CY2016Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.83
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	102000000	USD
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	230000000	USD
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	271000000	USD
CY2015Q4	us-gaap	Equity Method Investments EquityMethodInvestments	514000000	USD
CY2016Q4	us-gaap	Equity Method Investments EquityMethodInvestments	752000000	USD
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CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.99
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.51
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.60
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.32
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.242
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.245
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.136
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
CY2017Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	64000000	USD
CY2017	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y1M10D
CY2016Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	416000000	USD
CY2017Q4	us-gaap	Energy Related Inventory EnergyRelatedInventory	399000000	USD
CY2016Q4	us-gaap	Equity Method Investment Difference Between Carrying Amount And Underlying Equity EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity	73000000	USD
CY2017Q4	us-gaap	Equity Method Investment Difference Between Carrying Amount And Underlying Equity EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity	72000000	USD
CY2015	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	64000000	USD
CY2016	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	68000000	USD
CY2017	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	74000000	USD
CY2017Q4	us-gaap	Equity Method Investments EquityMethodInvestments	1073000000	USD
CY2017	us-gaap	Excise And Sales Taxes ExciseAndSalesTaxes	0	USD
CY2017	us-gaap	Extinguishment Of Debt Amount ExtinguishmentOfDebtAmount	385000000	USD
CY2016Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	70000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	96000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	26000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	25000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	25000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	25000000	USD
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	26000000	USD
CY2015	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	-106000000	USD
CY2016	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	-7000000	USD
CY2017	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	-41000000	USD
CY2015Q4	us-gaap	Goodwill Goodwill	2018000000	USD
CY2016Q4	us-gaap	Goodwill Goodwill	2286000000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	2293000000	USD
CY2016	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	268000000	USD
CY2017	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	7000000	USD
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	950000000	USD
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1105000000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1287000000	USD
CY2015	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	66000000	USD
CY2016	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	68000000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	175000000	USD
CY2015	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	5000000	USD
CY2016	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	5000000	USD
CY2017	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	5000000	USD
CY2015	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2016	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017Q4	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-105000000	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	-105000000	USD
CY2015	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	333000000	USD
CY2016	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	387000000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	450000000	USD
CY2015	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	-2000000	USD
CY2016	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	-12000000	USD
CY2017	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	-8000000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-4000000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-4000000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-4000000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	-8000000	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	-10000000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Other IncomeTaxReconciliationNondeductibleExpenseOther	-18000000	USD
CY2015	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	0	USD
CY2016	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	0	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-14000000	USD
CY2015	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	6000000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-7000000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	5000000	USD
CY2015	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	35000000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	58000000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	51000000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	7000000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	5000000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	4000000	USD
CY2015	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	122000000	USD
CY2016	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	145000000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits Other IncomeTaxReconciliationTaxCreditsOther	189000000	USD
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	14000000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-1000000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4000000	USD
CY2015	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	-259000000	USD
CY2016	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	226000000	USD
CY2017	us-gaap	Increase Decrease In Accounts And Other Receivables IncreaseDecreaseInAccountsAndOtherReceivables	252000000	USD
CY2015	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-158000000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	145000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	129000000	USD
CY2015	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	-47000000	USD
CY2016	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	-126000000	USD
CY2017	us-gaap	Increase Decrease In Derivative Assets And Liabilities IncreaseDecreaseInDerivativeAssetsAndLiabilities	94000000	USD
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-1000000	USD
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-37000000	USD
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	4000000	USD
CY2015	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-177000000	USD
CY2016	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-95000000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	54000000	USD
CY2015	us-gaap	Increase Decrease In Pension Plan Obligations IncreaseDecreaseInPensionPlanObligations	-147000000	USD
CY2016	us-gaap	Increase Decrease In Pension Plan Obligations IncreaseDecreaseInPensionPlanObligations	19000000	USD
CY2017	us-gaap	Increase Decrease In Pension Plan Obligations IncreaseDecreaseInPensionPlanObligations	-228000000	USD
CY2015	us-gaap	Increase Decrease In Postretirement Obligations IncreaseDecreaseInPostretirementObligations	-287000000	USD
CY2016	us-gaap	Increase Decrease In Postretirement Obligations IncreaseDecreaseInPostretirementObligations	-192000000	USD
CY2017	us-gaap	Increase Decrease In Postretirement Obligations IncreaseDecreaseInPostretirementObligations	25000000	USD
CY2015	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-85000000	USD
CY2016	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	40000000	USD
CY2017	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-217000000	USD
CY2015	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-97000000	USD
CY2016	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-1000000	USD
CY2017	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	2000000	USD
CY2016Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	912000000	USD
CY2017Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	963000000	USD
CY2016Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	842000000	USD
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	867000000	USD
CY2016	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	31000000	USD
CY2017	us-gaap	Interest Costs Incurred Capitalized InterestCostsIncurredCapitalized	36000000	USD
CY2015	us-gaap	Interest Expense InterestExpense	450000000	USD
CY2016	us-gaap	Interest Expense InterestExpense	472000000	USD
CY2017	us-gaap	Interest Expense InterestExpense	536000000	USD
CY2015	us-gaap	Interest Paid Net InterestPaidNet	428000000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	448000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	495000000	USD
CY2016Q4	us-gaap	Interest Payable Current InterestPayableCurrent	96000000	USD
CY2017Q4	us-gaap	Interest Payable Current InterestPayableCurrent	111000000	USD
CY2016Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	356000000	USD
CY2017Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	380000000	USD
CY2015	us-gaap	Investment Income Interest InvestmentIncomeInterest	13000000	USD
CY2016	us-gaap	Investment Income Interest InvestmentIncomeInterest	20000000	USD
CY2017	us-gaap	Investment Income Interest InvestmentIncomeInterest	12000000	USD
CY2016Q4	us-gaap	Junior Subordinated Long Term Notes JuniorSubordinatedLongTermNotes	756000000	USD
CY2017Q4	us-gaap	Junior Subordinated Long Term Notes JuniorSubordinatedLongTermNotes	1145000000	USD
CY2015	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	43000000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	43000000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	51000000	USD
CY2017Q4	us-gaap	Line Of Credit LineOfCredit	745000000	USD
CY2017Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	2120000000	USD
CY2017Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	1375000000	USD
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	12407000000	USD
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2437000000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	2812000000	USD
CY2016Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	8836000000	USD
CY2017Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	8780000000	USD
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	32041000000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	33767000000	USD
CY2016Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	11269000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	12185000000	USD
CY2016Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	14000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	109000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	9045000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	104000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	616000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	462000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	683000000	USD
CY2017Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	1497000000	USD
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	10506000000	USD
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	11039000000	USD
CY2016Q4	us-gaap	Long Term Investments LongTermInvestments	2273000000	USD
CY2017Q4	us-gaap	Long Term Investments LongTermInvestments	2797000000	USD
CY2016Q4	us-gaap	Minority Interest MinorityInterest	488000000	USD
CY2017Q4	us-gaap	Minority Interest MinorityInterest	478000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	277000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1359000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	421000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2204000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-3388000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2564000000	USD
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1916000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2084000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2117000000	USD
CY2015	us-gaap	Net Income Loss NetIncomeLoss	727000000	USD
CY2016Q1	us-gaap	Net Income Loss NetIncomeLoss	247000000	USD
CY2016Q2	us-gaap	Net Income Loss NetIncomeLoss	152000000	USD
CY2016Q3	us-gaap	Net Income Loss NetIncomeLoss	338000000	USD
CY2016Q4	us-gaap	Net Income Loss NetIncomeLoss	131000000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	868000000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	400000000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	177000000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	270000000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	287000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	1134000000	USD
CY2015	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-7000000	USD
CY2016	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-34000000	USD
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-22000000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	725000000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	866000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	1132000000	USD
CY2015	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	725000000	USD
CY2016	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	866000000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	1132000000	USD
CY2015	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-289000000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-340000000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-359000000	USD
CY2016Q4	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	73000000	USD
CY2017Q4	us-gaap	Notes And Loans Receivable Net Noncurrent NotesAndLoansReceivableNetNoncurrent	73000000	USD
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	1239000000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	569000000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	303000000	USD
CY2016Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	381000000	USD
CY2016Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	256000000	USD
CY2016Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	507000000	USD
CY2016Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	301000000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	1445000000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	418000000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	356000000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	1646000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	166000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	40000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	9000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	13000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	22000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	34000000	USD
CY2017Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	48000000	USD
CY2016Q4	us-gaap	Other Assets Current OtherAssetsCurrent	195000000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	199000000	USD
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	170000000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	161000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax	1000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-4000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	1000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	10000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	12000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	13000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-13000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-11000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-10000000	USD
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-8000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-6000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-5000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1000000	USD
CY2015	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	0	USD
CY2016Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	498000000	USD
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	525000000	USD
CY2016Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	349000000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	323000000	USD
CY2016Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	201000000	USD
CY2017Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	232000000	USD
CY2015	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	61000000	USD
CY2016	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	95000000	USD
CY2017	us-gaap	Other Nonoperating Expense OtherNonoperatingExpense	103000000	USD
CY2015	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	209000000	USD
CY2016	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	207000000	USD
CY2017	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	268000000	USD
CY2016Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	36000000	USD
CY2017Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	61000000	USD
CY2016Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	71000000	USD
CY2017Q4	us-gaap	Other Receivables Net Current OtherReceivablesNetCurrent	98000000	USD
CY2015	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	2000000	USD
CY2016	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	2000000	USD
CY2017	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Basic ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	2000000	USD
CY2015	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	2000000	USD
CY2016	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	2000000	USD
CY2017	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	2000000	USD
CY2015	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-52000000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-37000000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	37000000	USD
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	33000000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	51000000	USD
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	501000000	USD
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	531000000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	592000000	USD
CY2015	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	241000000	USD
CY2016	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	1147000000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2015	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	98000000	USD
CY2016	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	239000000	USD
CY2017	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	299000000	USD
CY2015	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	898000000	USD
CY2016	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	1463000000	USD
CY2017	us-gaap	Payments To Acquire Other Investments PaymentsToAcquireOtherInvestments	1226000000	USD
CY2015	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	8000000	USD
CY2016	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	5000000	USD
CY2017	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	40000000	USD
CY2015	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	19000000	USD
CY2016	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	11000000	USD
CY2017	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	10000000	USD
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	956000000	USD
CY2016Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	42000000	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2035000000	USD
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CY2016Q4	us-gaap	Proceeds From Issuance Of Mandatory Redeemable Capital Securities ProceedsFromIssuanceOfMandatoryRedeemableCapitalSecurities	654000000	USD
CY2015	us-gaap	Proceeds From Issuance Of Mandatory Redeemable Capital Securities ProceedsFromIssuanceOfMandatoryRedeemableCapitalSecurities	0	USD
CY2016	us-gaap	Proceeds From Issuance Of Mandatory Redeemable Capital Securities ProceedsFromIssuanceOfMandatoryRedeemableCapitalSecurities	654000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Mandatory Redeemable Capital Securities ProceedsFromIssuanceOfMandatoryRedeemableCapitalSecurities	0	USD
CY2015	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	23000000	USD
CY2016	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	114000000	USD
CY2017	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	50000000	USD
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CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-9000000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-81000000	USD
CY2015	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	101000000	USD
CY2016	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	0	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	122000000	USD
CY2015	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	885000000	USD
CY2016	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	1457000000	USD
CY2017	us-gaap	Proceeds From Sale And Maturity Of Other Investments ProceedsFromSaleAndMaturityOfOtherInvestments	1240000000	USD
CY2015	us-gaap	Profit Loss ProfitLoss	720000000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	834000000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	1112000000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	30029000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	31424000000	USD
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	19730000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	20721000000	USD
CY2015	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	21000000	USD
CY2016	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	21000000	USD
CY2017	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Cost Of Equity PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedCostOfEquity	23000000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	10299000000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	10703000000	USD
CY2016Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	19730000000	USD
CY2017Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	20721000000	USD
CY2017Q4	us-gaap	Purchase Obligation PurchaseObligation	7536000000	USD
CY2017Q4	us-gaap	Purchase Obligation Due After Fifth Year PurchaseObligationDueAfterFifthYear	2277000000	USD
CY2017Q4	us-gaap	Purchase Obligation Due In Fifth Year PurchaseObligationDueInFifthYear	371000000	USD
CY2017Q4	us-gaap	Purchase Obligation Due In Fourth Year PurchaseObligationDueInFourthYear	474000000	USD
CY2017Q4	us-gaap	Purchase Obligation Due In Next Twelve Months PurchaseObligationDueInNextTwelveMonths	2731000000	USD
CY2017Q4	us-gaap	Purchase Obligation Due In Second Year PurchaseObligationDueInSecondYear	1045000000	USD
CY2017Q4	us-gaap	Purchase Obligation Due In Third Year PurchaseObligationDueInThirdYear	638000000	USD
CY2015	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	6238000000	USD
CY2016	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	6497000000	USD
CY2017	us-gaap	Regulated Operating Revenue RegulatedOperatingRevenue	6434000000	USD
CY2016Q4	us-gaap	Regulatory Assets RegulatoryAssets	3913000000	USD
CY2017Q4	us-gaap	Regulatory Assets RegulatoryAssets	3778000000	USD
CY2017Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	55000000	USD
CY2016Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3871000000	USD
CY2017Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	3723000000	USD
CY2016Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	589000000	USD
CY2017Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	2893000000	USD
CY2016Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	34000000	USD
CY2017Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	18000000	USD
CY2016Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	555000000	USD
CY2017Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	2875000000	USD
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	286000000	USD
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	807000000	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	385000000	USD
CY2016Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	21000000	USD
CY2017Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	23000000	USD
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	5114000000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	5600000000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	5643000000	USD
CY2015	us-gaap	Revenues Revenues	10337000000	USD
CY2016Q1	us-gaap	Revenues Revenues	2566000000	USD
CY2016Q2	us-gaap	Revenues Revenues	2262000000	USD
CY2016Q3	us-gaap	Revenues Revenues	2928000000	USD
CY2016Q4	us-gaap	Revenues Revenues	2874000000	USD
CY2016	us-gaap	Revenues Revenues	10630000000	USD
CY2017Q1	us-gaap	Revenues Revenues	3236000000	USD
CY2017Q2	us-gaap	Revenues Revenues	2855000000	USD
CY2017Q3	us-gaap	Revenues Revenues	3245000000	USD
CY2017Q4	us-gaap	Revenues Revenues	3271000000	USD
CY2017	us-gaap	Revenues Revenues	12607000000	USD
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	14500000	shares
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	7000000	USD
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	4000000	USD
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	4000000	USD
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross		shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	7000000	USD
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	171517	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	105994	shares
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	41.59
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	42.95
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	39.37
CY2017Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	105994	shares
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P2Y18D
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares	0	shares
CY2017Q4	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Weighted Average Exercise Price1 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1	42.95
CY2017	us-gaap	Sharebased Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Weighted Average Remaining Contractual Term2 SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2	P2Y18D
CY2016Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	499000000	USD
CY2017Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	621000000	USD
CY2016Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.009
CY2017Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.019
CY2017	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	65523	shares
CY2016	us-gaap	Stock Issued During Period Value Acquisitions StockIssuedDuringPeriodValueAcquisitions	390000000	USD
CY2015	us-gaap	Stock Issued During Period Value Employee Benefit Plan StockIssuedDuringPeriodValueEmployeeBenefitPlan	117000000	USD
CY2015	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	9000000	USD
CY2015	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	0	USD
CY2016	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	0	USD
CY2017	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	0	USD
CY2016	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	33000000	USD
CY2017	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	51000000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	9011000000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	9512000000	USD
CY2014Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8342000000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	8795000000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9499000000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	9990000000	USD
CY2015	us-gaap	Stockholders Equity Other StockholdersEquityOther	-107000000	USD
CY2016	us-gaap	Stockholders Equity Other StockholdersEquityOther	-162000000	USD
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	-19000000	USD
CY2015	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	364000000	USD
CY2016	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	370000000	USD
CY2017	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	391000000	USD
CY2015	us-gaap	Trading Securities Realized Gain Loss TradingSecuritiesRealizedGainLoss	1000000	USD
CY2016	us-gaap	Trading Securities Realized Gain Loss TradingSecuritiesRealizedGainLoss	15000000	USD
CY2017	us-gaap	Trading Securities Realized Gain Loss TradingSecuritiesRealizedGainLoss	26000000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	9000000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	10000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	10000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	7000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	0	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	3000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	3000000	USD
CY2015	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	0	USD
CY2016	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	2000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Expense UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense	0	USD
CY2015	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	6000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	0	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	8000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	8000000	USD
CY2016	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	4133000000	USD
CY2015	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	4099000000	USD
CY2017	us-gaap	Unregulated Operating Revenue UnregulatedOperatingRevenue	6173000000	USD
CY2015	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	2214000000	USD
CY2016	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	2302000000	USD
CY2017	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	2335000000	USD
CY2017Q4	us-gaap	Variable Interest Entity Entity Maximum Loss Exposure Amount VariableInterestEntityEntityMaximumLossExposureAmount	0	USD
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	179000000	shares
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	179000000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	179000000	shares
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	179000000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	179000000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	179000000	shares
CY2017	us-gaap	Derivatives Methods Of Accounting Nonhedging Derivatives DerivativesMethodsOfAccountingNonhedgingDerivatives	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;text-align:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Revenues and energy costs related to trading contracts are presented on a net basis in DTE Energy's Consolidated Statements of Operations. Commodity derivatives used for trading purposes, and financial non-trading commodity derivatives, are accounted for using the MTM method with unrealized and realized gains and losses recorded in Operating Revenues — Non-utility operations. Non-trading physical commodity sale and purchase derivative contracts are generally accounted for using the MTM method with unrealized and realized gains and losses for sales recorded in Operating Revenues — Non-utility operations and purchases recorded in Fuel, purchased power, and gas — non-utility.</font></div></div>
CY2017	us-gaap	Derivatives Reporting Of Derivative Activity DerivativesReportingOfDerivativeActivity	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;text-align:left;text-indent:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Derivative Assets and Liabilities</font></div><div style="line-height:120%;padding-top:12px;text-align:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Derivative assets and liabilities are comprised of physical and financial derivative contracts, including futures, forwards, options, and swaps that are both exchange-traded and over-the-counter traded contracts. Various inputs are used to value derivatives depending on the type of contract and availability of market data. Exchange-traded derivative contracts are valued using quoted prices in active markets. The Registrants consider the following criteria in determining whether a market is considered active: frequency in which pricing information is updated, variability in pricing between sources or over time, and the availability of public information. Other derivative contracts are valued based upon a variety of inputs including commodity market prices, broker quotes, interest rates, credit ratings, default rates, market-based seasonality, and basis differential factors. The Registrants monitor the prices that are supplied by brokers and pricing services and may use a supplemental price source or change the primary price source of an index if prices become unavailable or another price source is determined to be more representative of fair value. The Registrants have obtained an understanding of how these prices are derived. Additionally, the Registrants selectively corroborate the fair value of their transactions by comparison of market-based price sources. Mathematical valuation models are used for derivatives for which external market data is not readily observable, such as contracts which extend beyond the actively traded reporting period. The Registrants have established a Risk Management Committee whose responsibilities include directly or indirectly ensuring all valuation methods are applied in accordance with predefined policies. The development and maintenance of the Registrants' forward price curves has been assigned to DTE Energy's Risk Management Department, which is separate and distinct from the trading functions within DTE Energy.</font></div><div style="line-height:120%;padding-top:12px;text-align:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"></font></div></div>
CY2017	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;text-align:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Certain prior year balances for the Registrants were reclassified to match the current year's Consolidated Financial Statements presentation.</font></div></div>

Files In Submission

Name	View Source	Status
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$DTE
DTE ENERGY CO Stock $dte

2017 Q4 Form 10-K Financial Statement

#000093634018000082 Filed on February 16, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$DTE DTE ENERGY CO Stock $dte

2017 Q4 Form 10-K Financial Statement

#000093634018000082 Filed on February 16, 2018

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$DTE
DTE ENERGY CO Stock $dte