2018 Q1 Form 10-K Financial Statement
#000078497718000005 Filed on February 16, 2018
Income Statement
| Concept | 2018 Q1 | 2017 | 2016 Q4 |
|---|---|---|---|
| Revenue | $493.0M | $2.009B | $524.0M |
| YoY Change | -6.98% | 4.47% | 5.01% |
| Cost Of Revenue | $184.0M | $776.0M | $316.0M |
| YoY Change | 18.71% | -16.11% | 40.44% |
| Gross Profit | $309.0M | $1.233B | $208.0M |
| YoY Change | -17.6% | 23.55% | -24.09% |
| Gross Profit Margin | 62.68% | 61.37% | 39.69% |
| Selling, General & Admin | $69.00M | $260.0M | $62.00M |
| YoY Change | 1.47% | 8.33% | 0.0% |
| % of Gross Profit | 22.33% | 21.09% | 29.81% |
| Research & Development | |||
| YoY Change | |||
| % of Gross Profit | |||
| Depreciation & Amortization | $92.00M | $345.0M | $77.00M |
| YoY Change | 9.52% | 7.48% | -1.28% |
| % of Gross Profit | 29.77% | 27.98% | 37.02% |
| Operating Expenses | $194.0M | $728.0M | $169.0M |
| YoY Change | 4.86% | 7.06% | -0.59% |
| Operating Profit | $100.0M | $380.0M | $39.00M |
| YoY Change | -19.35% | 11.76% | -62.5% |
| Interest Expense | $31.00M | $120.0M | $39.00M |
| YoY Change | 3.33% | 7.14% | -192.86% |
| % of Operating Profit | 31.0% | 31.58% | 100.0% |
| Other Income/Expense, Net | $3.000M | $13.00M | $1.000M |
| YoY Change | 50.0% | -13.33% | 0.0% |
| Pretax Income | $72.00M | $273.0M | $79.00M |
| YoY Change | -25.0% | 12.35% | 25.4% |
| Income Tax | $8.000M | $86.00M | $18.00M |
| % Of Pretax Income | 11.11% | 31.5% | 22.78% |
| Net Earnings | $64.00M | $187.0M | $61.00M |
| YoY Change | -12.33% | -3.11% | 19.61% |
| Net Earnings / Revenue | 12.98% | 9.31% | 11.64% |
| Basic Earnings Per Share | $2.10 | ||
| Diluted Earnings Per Share | $717.5K | $2.10 | $680.8K |
| COMMON SHARES | |||
| Basic Shares Outstanding | 89.11M shares | 89.06M shares | 88.93M shares |
| Diluted Shares Outstanding | 89.18M shares |
Balance Sheet
| Concept | 2018 Q1 | 2017 | 2016 Q4 |
|---|---|---|---|
| SHORT-TERM ASSETS | |||
| Cash & Short-Term Investments | $87.00M | $50.00M | $14.00M |
| YoY Change | 70.59% | 257.14% | -62.16% |
| Cash & Equivalents | $70.00M | $39.00M | $6.000M |
| Short-Term Investments | $17.00M | $11.00M | $8.000M |
| Other Short-Term Assets | $81.00M | $230.0M | $77.00M |
| YoY Change | -6.9% | 8.49% | -12.5% |
| Inventory | $80.00M | $78.00M | $82.00M |
| Prepaid Expenses | $48.00M | ||
| Receivables | $152.0M | $168.0M | $155.0M |
| Other Receivables | $0.00 | $0.00 | $0.00 |
| Total Short-Term Assets | $532.0M | $526.0M | $463.0M |
| YoY Change | 9.69% | 13.61% | -16.88% |
| LONG-TERM ASSETS | |||
| Property, Plant & Equipment | $6.781B | $6.134B | $5.862B |
| YoY Change | 4.87% | 4.64% | -2.5% |
| Goodwill | |||
| YoY Change | |||
| Intangibles | |||
| YoY Change | |||
| Long-Term Investments | |||
| YoY Change | |||
| Other Assets | $53.00M | $571.0M | $57.00M |
| YoY Change | -1.85% | -9.37% | 29.55% |
| Total Long-Term Assets | $7.360B | $7.312B | $7.064B |
| YoY Change | 3.27% | 3.51% | 6.18% |
| TOTAL ASSETS | |||
| Total Short-Term Assets | $532.0M | $526.0M | $463.0M |
| Total Long-Term Assets | $7.360B | $7.312B | $7.064B |
| Total Assets | $7.892B | $7.838B | $7.527B |
| YoY Change | 3.68% | 4.13% | 4.4% |
| SHORT-TERM LIABILITIES | |||
| YoY Change | |||
| Accounts Payable | $97.00M | $132.0M | $129.0M |
| YoY Change | 5.43% | 2.33% | 31.63% |
| Accrued Expenses | $138.0M | $148.0M | $148.0M |
| YoY Change | -2.13% | 0.0% | -1.99% |
| Deferred Revenue | |||
| YoY Change | |||
| Short-Term Debt | $0.00 | $0.00 | $0.00 |
| YoY Change | -100.0% | ||
| Long-Term Debt Due | $0.00 | $150.0M | |
| YoY Change | -100.0% | 12.78% | |
| Total Short-Term Liabilities | $393.0M | $432.0M | $577.0M |
| YoY Change | -28.28% | -25.13% | -7.83% |
| LONG-TERM LIABILITIES | |||
| Long-Term Debt | $2.426B | $2.426B | $2.200B |
| YoY Change | 10.27% | 10.27% | 6.8% |
| Other Long-Term Liabilities | $198.0M | $2.188B | $107.0M |
| YoY Change | 75.22% | 25.96% | 268.97% |
| Total Long-Term Liabilities | $2.624B | $4.614B | $2.307B |
| YoY Change | 13.45% | 17.2% | 10.44% |
| TOTAL LIABILITIES | |||
| Total Short-Term Liabilities | $393.0M | $432.0M | $577.0M |
| Total Long-Term Liabilities | $2.624B | $4.614B | $2.307B |
| Total Liabilities | $5.443B | $5.422B | $5.183B |
| YoY Change | 4.17% | 4.61% | 4.66% |
| SHAREHOLDERS EQUITY | |||
| Retained Earnings | $1.251B | $1.150B | |
| YoY Change | 4.69% | 7.48% | |
| Common Stock | $1.206B | $1.201B | |
| YoY Change | 0.5% | 0.42% | |
| Preferred Stock | |||
| YoY Change | |||
| Treasury Stock (at cost) | |||
| YoY Change | |||
| Treasury Stock Shares | |||
| Shareholders Equity | $2.449B | $2.416B | $2.344B |
| YoY Change | |||
| Total Liabilities & Shareholders Equity | $7.892B | $7.838B | $7.527B |
| YoY Change | 3.68% | 4.13% | 4.4% |
Cashflow Statement
| Concept | 2018 Q1 | 2017 | 2016 Q4 |
|---|---|---|---|
| OPERATING ACTIVITIES | |||
| Net Income | $64.00M | $187.0M | $61.00M |
| YoY Change | -12.33% | -3.11% | 19.61% |
| Depreciation, Depletion And Amortization | $92.00M | $345.0M | $77.00M |
| YoY Change | 9.52% | 7.48% | -1.28% |
| Cash From Operating Activities | $194.0M | $597.0M | $56.00M |
| YoY Change | 14.12% | 6.23% | -28.21% |
| INVESTING ACTIVITIES | |||
| Capital Expenditures | $131.0M | $514.0M | -$130.0M |
| YoY Change | 14.91% | -11.99% | -10.96% |
| Acquisitions | |||
| YoY Change | |||
| Other Investing Activities | -$1.000M | $3.000M | -$1.000M |
| YoY Change | -200.0% | 0.0% | -200.0% |
| Cash From Investing Activities | -$130.0M | -$514.0M | -$131.0M |
| YoY Change | 15.04% | -12.14% | -9.66% |
| FINANCING ACTIVITIES | |||
| Cash Dividend Paid | $30.00M | $118.0M | |
| YoY Change | 7.14% | 7.27% | |
| Common Stock Issuance & Retirement, Net | $0.00 | ||
| YoY Change | |||
| Debt Paid & Issued, Net | $150.0M | ||
| YoY Change | 12.78% | ||
| Cash From Financing Activities | -$33.00M | -$50.00M | -7.000M |
| YoY Change | 3.13% | -300.0% | -66.67% |
| NET CHANGE | |||
| Cash From Operating Activities | $194.0M | $597.0M | 56.00M |
| Cash From Investing Activities | -$130.0M | -$514.0M | -131.0M |
| Cash From Financing Activities | -$33.00M | -$50.00M | -7.000M |
| Net Change In Cash | $31.00M | $33.00M | -82.00M |
| YoY Change | 24.0% | 1550.0% | -6.82% |
| FREE CASH FLOW | |||
| Cash From Operating Activities | $194.0M | $597.0M | $56.00M |
| Capital Expenditures | $131.0M | $514.0M | -$130.0M |
| Free Cash Flow | $63.00M | $83.00M | $186.0M |
| YoY Change | 12.5% | -477.27% | -16.96% |
Facts In Submission
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Investment In Trojan
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0.87 | |
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Jointly Owned Plant Boardman Plant In Service Year
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1980 | |
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1986 | |
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57 | |
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1958 | |
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1964 | |
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546000000 | USD |
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625000 | shares |
| CY2017 | por |
Estimated Average Service Life Hydro Production Plant
EstimatedAverageServiceLifeHydroProductionPlant
|
95 | |
| CY2017 | por |
Estimated Average Service Life Wind Production Plant
EstimatedAverageServiceLifeWindProductionPlant
|
30 | |
| CY2017 | por |
Estimated Average Service Lives Distribution Plant
EstimatedAverageServiceLivesDistributionPlant
|
45 | |
| CY2017 | por |
Estimated Average Service Lives General Plant
EstimatedAverageServiceLivesGeneralPlant
|
12 | |
| CY2017Q4 | por |
Estimatedtotalremediationcostsdiscounted
Estimatedtotalremediationcostsdiscounted
|
1100000000 | USD |
| CY2016Q4 | por |
Fair Value Money Market Funds
FairValueMoneyMarketFunds
|
1000000 | USD |
| CY2017Q4 | por |
Fair Value Money Market Funds
FairValueMoneyMarketFunds
|
1000000 | USD |
| CY2016Q4 | por |
Fair Value Of Money Market Funds Other Post Retirement Benefit Plan Assets At Fair Value
FairValueOfMoneyMarketFundsOtherPostRetirementBenefitPlanAssetsAtFairValue
|
4000000 | USD |
| CY2017 | por |
Ferc Authorized Short Term Debt Effective Through February62014
FercAuthorizedShortTermDebtEffectiveThroughFebruary62014
|
900000000 | USD |
| CY2017Q4 | por |
First Mortgage Bonds Maximum Rate
FirstMortgageBondsMaximumRate
|
0.0931 | |
| CY2017Q4 | por |
First Mortgage Bonds Minimum Rate
FirstMortgageBondsMinimumRate
|
0.0251 | |
| CY2015 | por |
Franchise Taxes
FranchiseTaxes
|
43000000 | USD |
| CY2016 | por |
Franchise Taxes
FranchiseTaxes
|
43000000 | USD |
| CY2017 | por |
Franchise Taxes
FranchiseTaxes
|
43000000 | USD |
| CY2017Q4 | por |
Incorporated Cities
IncorporatedCities
|
51 | |
| CY2017 | por |
Increaseinnetdeferredtaxregulatoryliabilitily
Increaseinnetdeferredtaxregulatoryliabilitily
|
357000000 | USD |
| CY2017Q4 | por |
Jointly Owned Utility Plant Gross Ownership Amount Of Peltonround Butte Plant In Service
JointlyOwnedUtilityPlantGrossOwnershipAmountOfPeltonroundButtePlantInService
|
251000000 | USD |
| CY2017Q4 | por |
Jointly Owned Utility Plant Ownership Amount Of Boardman Plant Accumulated Depreciation
JointlyOwnedUtilityPlantOwnershipAmountOfBoardmanPlantAccumulatedDepreciation
|
426000000 | USD |
| CY2017Q4 | por |
Jointly Owned Utility Plant Ownership Amount Of Colstrip Plant Accumulated Depreciation
JointlyOwnedUtilityPlantOwnershipAmountOfColstripPlantAccumulatedDepreciation
|
351000000 | USD |
| CY2017Q4 | por |
Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress Boardman
JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgressBoardman
|
0 | USD |
| CY2017Q4 | por |
Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress Colstrip
JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgressColstrip
|
5000000 | USD |
| CY2017Q4 | por |
Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress Peltonround Butte
JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgressPeltonroundButte
|
7000000 | USD |
| CY2017Q4 | por |
Jointly Owned Utility Plant Ownership Amount Of Peltonround Butte Plant Accumulated Depreciation
JointlyOwnedUtilityPlantOwnershipAmountOfPeltonroundButtePlantAccumulatedDepreciation
|
68000000 | USD |
| CY2017Q4 | por |
Jointly Owned Utility Plant Proportionate Ownership Share Of Boardman
JointlyOwnedUtilityPlantProportionateOwnershipShareOfBoardman
|
0.9000 | |
| CY2017Q4 | por |
Jointly Owned Utility Plant Proportionate Ownership Share Of Colstrip
JointlyOwnedUtilityPlantProportionateOwnershipShareOfColstrip
|
0.2000 | |
| CY2017Q4 | por |
Jointly Owned Utility Plant Proportionate Ownership Share Of Peltonround Butte
JointlyOwnedUtilityPlantProportionateOwnershipShareOfPeltonroundButte
|
0.6667 | |
| CY2017Q4 | por |
Letterofcreditfacility
Letterofcreditfacility
|
220000000 | USD |
| CY2016 | por |
Level3 Realized And Unrealized Losses Offset By Effect Of Regulatory Accounting
Level3RealizedAndUnrealizedLossesOffsetByEffectOfRegulatoryAccounting
|
11000000 | USD |
| CY2017 | por |
Level3 Realized And Unrealized Losses Offset By Effect Of Regulatory Accounting
Level3RealizedAndUnrealizedLossesOffsetByEffectOfRegulatoryAccounting
|
41000000 | USD |
| CY2017 | por |
Line Of Credit Facitlity Covenant Terms One Month Term
LineOfCreditFacitlityCovenantTermsOneMonthTerm
|
one | |
| CY2017 | por |
Line Of Credit Facitlity Covenant Terms Six Month Term
LineOfCreditFacitlityCovenantTermsSixMonthTerm
|
six | |
| CY2017 | por |
Line Of Credit Facitlity Covenant Terms Three Month Term
LineOfCreditFacitlityCovenantTermsThreeMonthTerm
|
three | |
| CY2017 | por |
Line Of Credit Facitlity Covenant Terms Two Month Term
LineOfCreditFacitlityCovenantTermsTwoMonthTerm
|
two | |
| CY2017 | por |
Maximum Percentage Of Output Possibley Allocated
MaximumPercentageOfOutputPossibleyAllocated
|
0.25 | |
| CY2017 | por |
Net Actuarial Loss Portion Of Amortization From Aocl For Non Qualified Benefits
NetActuarialLossPortionOfAmortizationFromAoclForNonQualifiedBenefits
|
1000000 | USD |
| CY2017 | por |
Net Actuarial Loss Portion Of Amortization From Aocl For Pension Benefits
NetActuarialLossPortionOfAmortizationFromAoclForPensionBenefits
|
17000000 | USD |
| CY2015 | por |
Net Gain Or Loss Recognized In Statement Of Income Offset By Regulatory Accounting
NetGainOrLossRecognizedInStatementOfIncomeOffsetByRegulatoryAccounting
|
160000000 | USD |
| CY2016 | por |
Net Gain Or Loss Recognized In Statement Of Income Offset By Regulatory Accounting
NetGainOrLossRecognizedInStatementOfIncomeOffsetByRegulatoryAccounting
|
13000000 | USD |
| CY2017 | por |
Net Gain Or Loss Recognized In Statement Of Income Offset By Regulatory Accounting
NetGainOrLossRecognizedInStatementOfIncomeOffsetByRegulatoryAccounting
|
82000000 | USD |
| CY2015Q4 | por |
Net Liabilities From Price Risk Management Activities Classified As Level3
NetLiabilitiesFromPriceRiskManagementActivitiesClassifiedAsLevel3
|
119000000 | USD |
| CY2016Q4 | por |
Net Liabilities From Price Risk Management Activities Classified As Level3
NetLiabilitiesFromPriceRiskManagementActivitiesClassifiedAsLevel3
|
119000000 | USD |
| CY2017Q4 | por |
Net Liabilities From Price Risk Management Activities Classified As Level3
NetLiabilitiesFromPriceRiskManagementActivitiesClassifiedAsLevel3
|
139000000 | USD |
| CY2016 | por |
Net Realized Losses
NetRealizedLosses
|
0 | USD |
| CY2017 | por |
Net Realized Losses
NetRealizedLosses
|
6000000 | USD |
| CY2016Q4 | por |
Noncurrent Derivative Liabilities
NoncurrentDerivativeLiabilities
|
125000000 | USD |
| CY2017Q4 | por |
Noncurrent Derivative Liabilities
NoncurrentDerivativeLiabilities
|
151000000 | USD |
| CY2017Q4 | por |
Number Of Retail Customers
NumberOfRetailCustomers
|
875000 | retail_customers |
| CY2017Q4 | por |
Number Of Union Employees
NumberOfUnionEmployees
|
785 | shares |
| CY2017Q4 | por |
Number Of Union Employees Subject To Agreement A
NumberOfUnionEmployeesSubjectToAgreementA
|
732 | shares |
| CY2017Q4 | por |
Number Of Union Employees Subject To Agreement B
NumberOfUnionEmployeesSubjectToAgreementB
|
53 | shares |
| CY2016 | por |
Numberof Years
NumberofYears
|
3 | |
| CY2017 | por |
Numberof Years
NumberofYears
|
3 | |
| CY2016Q4 | por |
Other Current Liabilities Other
OtherCurrentLiabilitiesOther
|
71000000 | USD |
| CY2017Q4 | por |
Other Current Liabilities Other
OtherCurrentLiabilitiesOther
|
61000000 | USD |
| CY2016Q4 | por |
Otherpostretirementdefinedbenefitplanliabilitycurrent
Otherpostretirementdefinedbenefitplanliabilitycurrent
|
2000000 | USD |
| CY2017Q4 | por |
Otherpostretirementdefinedbenefitplanliabilitycurrent
Otherpostretirementdefinedbenefitplanliabilitycurrent
|
2000000 | USD |
| CY2017Q4 | por |
Percent Of States Population
PercentOfStatesPopulation
|
0.46 | |
| CY2017 | por |
Performancebasedstockawardpercentagemaximum
Performancebasedstockawardpercentagemaximum
|
1.50 | |
| CY2017 | por |
Performancebasedstockawardpercentageminimum
Performancebasedstockawardpercentageminimum
|
0 | |
| CY2016Q4 | por |
Pollution Control Revenue Bonds Owned By Pge
PollutionControlRevenueBondsOwnedByPge
|
21000000 | USD |
| CY2017Q4 | por |
Pollution Control Revenue Bonds Owned By Pge
PollutionControlRevenueBondsOwnedByPge
|
21000000 | USD |
| CY2017 | por |
Power Cost Deadband Lower Threshold
PowerCostDeadbandLowerThreshold
|
15000000 | USD |
| CY2017 | por |
Power Cost Deadband Upper Threshold
PowerCostDeadbandUpperThreshold
|
30000000 | USD |
| CY2016Q4 | por |
Public Utilities Property Plant And Equipment General
PublicUtilitiesPropertyPlantAndEquipmentGeneral
|
501000000 | USD |
| CY2017Q4 | por |
Public Utilities Property Plant And Equipment General
PublicUtilitiesPropertyPlantAndEquipmentGeneral
|
550000000 | USD |
| CY2016Q4 | por |
Public Utilities Property Plant And Equipment Intangible
PublicUtilitiesPropertyPlantAndEquipmentIntangible
|
572000000 | USD |
| CY2017Q4 | por |
Public Utilities Property Plant And Equipment Intangible
PublicUtilitiesPropertyPlantAndEquipmentIntangible
|
607000000 | USD |
| CY2016 | por |
Realized And Unrealized Gains And Losses Net Commodity Contract
RealizedAndUnrealizedGainsAndLossesNetCommodityContract
|
11000000 | USD |
| CY2017 | por |
Realized And Unrealized Gains And Losses Net Commodity Contract
RealizedAndUnrealizedGainsAndLossesNetCommodityContract
|
35000000 | USD |
| CY2015 | por |
Realized And Unrealized Gains And Losses Net Commodity Contracts Electricity
RealizedAndUnrealizedGainsAndLossesNetCommodityContractsElectricity
|
72000000 | USD |
| CY2016 | por |
Realized And Unrealized Gains And Losses Net Commodity Contracts Electricity
RealizedAndUnrealizedGainsAndLossesNetCommodityContractsElectricity
|
34000000 | USD |
| CY2017 | por |
Realized And Unrealized Gains And Losses Net Commodity Contracts Electricity
RealizedAndUnrealizedGainsAndLossesNetCommodityContractsElectricity
|
41000000 | USD |
| CY2015 | por |
Realized And Unrealized Gains And Losses Net Commodity Contracts Foreign Currency
RealizedAndUnrealizedGainsAndLossesNetCommodityContractsForeignCurrency
|
1000000 | USD |
| CY2016 | por |
Realized And Unrealized Gains And Losses Net Commodity Contracts Foreign Currency
RealizedAndUnrealizedGainsAndLossesNetCommodityContractsForeignCurrency
|
0 | USD |
| CY2017 | por |
Realized And Unrealized Gains And Losses Net Commodity Contracts Foreign Currency
RealizedAndUnrealizedGainsAndLossesNetCommodityContractsForeignCurrency
|
-1000000 | USD |
| CY2015 | por |
Realized And Unrealized Gains And Losses Net Commodity Contracts Natural Gas
RealizedAndUnrealizedGainsAndLossesNetCommodityContractsNaturalGas
|
103000000 | USD |
| CY2016 | por |
Realized And Unrealized Gains And Losses Net Commodity Contracts Natural Gas
RealizedAndUnrealizedGainsAndLossesNetCommodityContractsNaturalGas
|
-56000000 | USD |
| CY2017 | por |
Realized And Unrealized Gains And Losses Net Commodity Contracts Natural Gas
RealizedAndUnrealizedGainsAndLossesNetCommodityContractsNaturalGas
|
85000000 | USD |
| CY2008Q3 | por |
Refund To Customers For Trojan Investment Including Interest
RefundToCustomersForTrojanInvestmentIncludingInterest
|
33000000 | USD |
| CY2017Q4 | por |
Regulatory Assets Earning Rate Of Return At Approved Rate
RegulatoryAssetsEarningRateOfReturnAtApprovedRate
|
25000000 | USD |
| CY2017Q4 | por |
Regulatory Assets Earning Rate Of Return At Cost Of Capital
RegulatoryAssetsEarningRateOfReturnAtCostOfCapital
|
10000000 | USD |
| CY2017 | por |
Stock Based Compensation Forfeiture Rate
StockBasedCompensationForfeitureRate
|
0.05 | |
| CY2015 | por |
Stock Based Compensation Impact On Cash Flows
StockBasedCompensationImpactOnCashFlows
|
0 | USD |
| CY2016 | por |
Stock Based Compensation Impact On Cash Flows
StockBasedCompensationImpactOnCashFlows
|
0 | USD |
| CY2017Q4 | por |
Regulatory Assets Earning Rate Of Return By Inclusion In Rate Base
RegulatoryAssetsEarningRateOfReturnByInclusionInRateBase
|
14000000 | USD |
| CY2017Q4 | por |
Regulatory Assets Earning Return
RegulatoryAssetsEarningReturn
|
51000000 | USD |
| CY2016Q4 | por |
Regulatory Assets Earning Return Other Category
RegulatoryAssetsEarningReturnOtherCategory
|
44000000 | USD |
| CY2017Q4 | por |
Regulatory Assets Earning Return Other Category
RegulatoryAssetsEarningReturnOtherCategory
|
51000000 | USD |
| CY2016Q4 | por |
Regulatory Assets From Price Risk Management Activities
RegulatoryAssetsFromPriceRiskManagementActivities
|
18000000 | USD |
| CY2017Q4 | por |
Regulatory Assets From Price Risk Management Activities
RegulatoryAssetsFromPriceRiskManagementActivities
|
6000000 | USD |
| CY2017 | por |
Remaining Recovery Periodof Regulatory Asset Debt Issuance Costs
RemainingRecoveryPeriodofRegulatoryAssetDebtIssuanceCosts
|
6 years | |
| CY2017 | por |
Remaining Recovery Periodof Regulatory Assets Price Risk Management
RemainingRecoveryPeriodofRegulatoryAssetsPriceRiskManagement
|
6 years | |
| CY2017 | por |
Remainingrefundperiodofregulatoryliability Trojandecommissioningactivities
RemainingrefundperiodofregulatoryliabilityTrojandecommissioningactivities
|
5 years | |
| CY2017Q4 | por |
Remarketable Pollution Control Bonds
RemarketablePollutionControlBonds
|
21000000 | USD |
| CY2017Q4 | por |
Service Area Population
ServiceAreaPopulation
|
1900000 | shares |
| CY2017Q4 | por |
Service Area Sq Miles
ServiceAreaSqMiles
|
4000 | sqmi |
| CY2015 | por |
Short Term Debt Maximum Amount Outstanding During Year
ShortTermDebtMaximumAmountOutstandingDuringYear
|
11000000 | USD |
| CY2016 | por |
Short Term Debt Maximum Amount Outstanding During Year
ShortTermDebtMaximumAmountOutstandingDuringYear
|
23000000 | USD |
| CY2017 | por |
Short Term Debt Maximum Amount Outstanding During Year
ShortTermDebtMaximumAmountOutstandingDuringYear
|
0 | USD |
| CY2015 | por |
Stock Based Compensation Attainment Of Performance Goals That Allows Vesting
StockBasedCompensationAttainmentOfPerformanceGoalsThatAllowsVesting
|
1.182 | |
| CY2016 | por |
Stock Based Compensation Attainment Of Performance Goals That Allows Vesting
StockBasedCompensationAttainmentOfPerformanceGoalsThatAllowsVesting
|
1.208 | |
| CY2017 | por |
Stock Based Compensation Attainment Of Performance Goals That Allows Vesting
StockBasedCompensationAttainmentOfPerformanceGoalsThatAllowsVesting
|
1.070 | |
| CY2017 | por |
Stock Based Compensation Impact On Cash Flows
StockBasedCompensationImpactOnCashFlows
|
0 | USD |
| CY2013Q2 | por |
Stockoffering
Stockoffering
|
11100000 | shares |
| CY2013 | por |
Stockoffering
Stockoffering
|
700000 | shares |
| CY2015Q2 | por |
Stockoffering
Stockoffering
|
10400000 | shares |
| CY2017Q4 | por |
Tax Credit Carryforward Federal
TaxCreditCarryforwardFederal
|
50000000 | USD |
| CY2016Q4 | por |
Trojan Decommissioning Activities
TrojanDecommissioningActivities
|
44000000 | USD |
| CY2017Q4 | por |
Trojan Decommissioning Activities
TrojanDecommissioningActivities
|
45000000 | USD |
| CY2016Q4 | por |
Unbilled Revenue
UnbilledRevenue
|
107000000 | USD |
| CY2017Q4 | por |
Unbilled Revenue
UnbilledRevenue
|
106000000 | USD |
| CY2016Q4 | por |
Volume Related To Derivative Instruments At Balance Sheet Date Commodity Contracts Natural Gas
VolumeRelatedToDerivativeInstrumentsAtBalanceSheetDateCommodityContractsNaturalGas
|
107000000 | MMBTU |
| CY2017Q4 | por |
Volume Related To Derivative Instruments At Balance Sheet Date Commodity Contracts Natural Gas
VolumeRelatedToDerivativeInstrumentsAtBalanceSheetDateCommodityContractsNaturalGas
|
114000000 | MMBTU |
| CY2016Q4 | por |
Volume Related To Derivative Instruments Held At Balance Sheet Date Commodity Contracts Electricity
VolumeRelatedToDerivativeInstrumentsHeldAtBalanceSheetDateCommodityContractsElectricity
|
8000000 | MWh |
| CY2017Q4 | por |
Volume Related To Derivative Instruments Held At Balance Sheet Date Commodity Contracts Electricity
VolumeRelatedToDerivativeInstrumentsHeldAtBalanceSheetDateCommodityContractsElectricity
|
7000000 | MWh |
| CY2016Q4 | por |
Volume Relatedto Derivative Instruments Heldat Balance Sheet Date Foreign Currency
VolumeRelatedtoDerivativeInstrumentsHeldatBalanceSheetDateForeignCurrency
|
22000000 | CAD |
| CY2017Q4 | por |
Volume Relatedto Derivative Instruments Heldat Balance Sheet Date Foreign Currency
VolumeRelatedtoDerivativeInstrumentsHeldatBalanceSheetDateForeignCurrency
|
21000000 | CAD |
| CY2015 | por |
Wholesaleaccountsreceivablewrittenoff
Wholesaleaccountsreceivablewrittenoff
|
0 | USD |
| CY2016 | por |
Wholesaleaccountsreceivablewrittenoff
Wholesaleaccountsreceivablewrittenoff
|
0 | USD |
| CY2017 | por |
Wholesaleaccountsreceivablewrittenoff
Wholesaleaccountsreceivablewrittenoff
|
0 | USD |
| CY2016Q4 | us-gaap |
Accounts Payable And Accrued Liabilities Current
AccountsPayableAndAccruedLiabilitiesCurrent
|
129000000 | USD |
| CY2017Q4 | us-gaap |
Accounts Payable And Accrued Liabilities Current
AccountsPayableAndAccruedLiabilitiesCurrent
|
132000000 | USD |
| CY2016Q4 | us-gaap |
Accounts Receivable Net Current
AccountsReceivableNetCurrent
|
155000000 | USD |
| CY2017Q4 | us-gaap |
Accounts Receivable Net Current
AccountsReceivableNetCurrent
|
168000000 | USD |
| CY2015Q4 | us-gaap |
Accrued Capping Closure Post Closure And Environmental Costs Noncurrent
AccruedCappingClosurePostClosureAndEnvironmentalCostsNoncurrent
|
17000000 | USD |
| CY2016Q4 | us-gaap |
Accumulated Other Comprehensive Income Loss Net Of Tax
AccumulatedOtherComprehensiveIncomeLossNetOfTax
|
-7000000 | USD |
| CY2017Q4 | us-gaap |
Accumulated Other Comprehensive Income Loss Net Of Tax
AccumulatedOtherComprehensiveIncomeLossNetOfTax
|
-8000000 | USD |
| CY2015 | us-gaap |
Adjustments Related To Tax Withholding For Share Based Compensation
AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
|
0 | USD |
| CY2016 | us-gaap |
Adjustments Related To Tax Withholding For Share Based Compensation
AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
|
2000000 | USD |
| CY2017 | us-gaap |
Adjustments Related To Tax Withholding For Share Based Compensation
AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
|
3000000 | USD |
| CY2015 | us-gaap |
Adjustments To Additional Paid In Capital Stock Issued Issuance Costs
AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
|
12000000 | USD |
| CY2016 | us-gaap |
Adjustments To Additional Paid In Capital Stock Issued Issuance Costs
AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
|
USD | |
| CY2014Q4 | us-gaap |
Allowance For Doubtful Accounts Receivable Current
AllowanceForDoubtfulAccountsReceivableCurrent
|
6000000 | USD |
| CY2015Q4 | us-gaap |
Allowance For Doubtful Accounts Receivable Current
AllowanceForDoubtfulAccountsReceivableCurrent
|
6000000 | USD |
| CY2016Q4 | us-gaap |
Allowance For Doubtful Accounts Receivable Current
AllowanceForDoubtfulAccountsReceivableCurrent
|
6000000 | USD |
| CY2017Q4 | us-gaap |
Allowance For Doubtful Accounts Receivable Current
AllowanceForDoubtfulAccountsReceivableCurrent
|
6000000 | USD |
| CY2015 | us-gaap |
Allowance For Doubtful Accounts Receivable Write Offs
AllowanceForDoubtfulAccountsReceivableWriteOffs
|
6000000 | USD |
| CY2016 | us-gaap |
Allowance For Doubtful Accounts Receivable Write Offs
AllowanceForDoubtfulAccountsReceivableWriteOffs
|
5000000 | USD |
| CY2017 | us-gaap |
Allowance For Doubtful Accounts Receivable Write Offs
AllowanceForDoubtfulAccountsReceivableWriteOffs
|
6000000 | USD |
| CY2015 | us-gaap |
Amortization Of Intangible Assets
AmortizationOfIntangibleAssets
|
38000000 | USD |
| CY2016 | us-gaap |
Amortization Of Intangible Assets
AmortizationOfIntangibleAssets
|
44000000 | USD |
| CY2017 | us-gaap |
Amortization Of Intangible Assets
AmortizationOfIntangibleAssets
|
46000000 | USD |
| CY2017Q4 | us-gaap |
Amount Of Regulatory Costs Not Yet Approved
AmountOfRegulatoryCostsNotYetApproved
|
2000000 | USD |
| CY2014Q4 | us-gaap |
Asset Retirement Obligation
AssetRetirementObligation
|
116000000 | USD |
| CY2015Q4 | us-gaap |
Asset Retirement Obligation
AssetRetirementObligation
|
151000000 | USD |
| CY2016Q4 | us-gaap |
Asset Retirement Obligation
AssetRetirementObligation
|
161000000 | USD |
| CY2017Q4 | us-gaap |
Asset Retirement Obligation
AssetRetirementObligation
|
167000000 | USD |
| CY2015 | us-gaap |
Asset Retirement Obligation Accretion Expense
AssetRetirementObligationAccretionExpense
|
7000000 | USD |
| CY2016 | us-gaap |
Asset Retirement Obligation Accretion Expense
AssetRetirementObligationAccretionExpense
|
7000000 | USD |
| CY2017 | us-gaap |
Asset Retirement Obligation Accretion Expense
AssetRetirementObligationAccretionExpense
|
7000000 | USD |
| CY2015 | us-gaap |
Asset Retirement Obligation Liabilities Incurred
AssetRetirementObligationLiabilitiesIncurred
|
2000000 | USD |
| CY2016 | us-gaap |
Asset Retirement Obligation Liabilities Incurred
AssetRetirementObligationLiabilitiesIncurred
|
1000000 | USD |
| CY2017 | us-gaap |
Asset Retirement Obligation Liabilities Incurred
AssetRetirementObligationLiabilitiesIncurred
|
2000000 | USD |
| CY2015 | us-gaap |
Asset Retirement Obligation Liabilities Settled
AssetRetirementObligationLiabilitiesSettled
|
4000000 | USD |
| CY2016 | us-gaap |
Asset Retirement Obligation Liabilities Settled
AssetRetirementObligationLiabilitiesSettled
|
3000000 | USD |
| CY2017 | us-gaap |
Asset Retirement Obligation Liabilities Settled
AssetRetirementObligationLiabilitiesSettled
|
3000000 | USD |
| CY2017 | us-gaap |
Asset Retirement Obligation Period Increase Decrease
AssetRetirementObligationPeriodIncreaseDecrease
|
6000000 | USD |
| CY2015 | us-gaap |
Asset Retirement Obligation Revision Of Estimate
AssetRetirementObligationRevisionOfEstimate
|
30000000 | USD |
| CY2016 | us-gaap |
Asset Retirement Obligation Revision Of Estimate
AssetRetirementObligationRevisionOfEstimate
|
5000000 | USD |
| CY2017 | us-gaap |
Asset Retirement Obligation Revision Of Estimate
AssetRetirementObligationRevisionOfEstimate
|
0 | USD |
| CY2016Q4 | us-gaap |
Assets
Assets
|
7527000000 | USD |
| CY2017Q4 | us-gaap |
Assets
Assets
|
7838000000 | USD |
| CY2016Q4 | us-gaap |
Assets Current
AssetsCurrent
|
463000000 | USD |
| CY2017Q4 | us-gaap |
Assets Current
AssetsCurrent
|
526000000 | USD |
| CY2016Q4 | us-gaap |
Assets Fair Value Disclosure
AssetsFairValueDisclosure
|
72000000 | USD |
| CY2017Q4 | us-gaap |
Assets Fair Value Disclosure
AssetsFairValueDisclosure
|
57000000 | USD |
| CY2016Q4 | us-gaap |
Assets Held In Trust Noncurrent
AssetsHeldInTrustNoncurrent
|
34000000 | USD |
| CY2017Q4 | us-gaap |
Assets Held In Trust Noncurrent
AssetsHeldInTrustNoncurrent
|
37000000 | USD |
| CY2015 | us-gaap |
Capital Expenditures Incurred But Not Yet Paid
CapitalExpendituresIncurredButNotYetPaid
|
32000000 | USD |
| CY2016 | us-gaap |
Capital Expenditures Incurred But Not Yet Paid
CapitalExpendituresIncurredButNotYetPaid
|
50000000 | USD |
| CY2017 | us-gaap |
Capital Expenditures Incurred But Not Yet Paid
CapitalExpendituresIncurredButNotYetPaid
|
53000000 | USD |
| CY2017Q4 | us-gaap |
Capital Lease Obligations Current
CapitalLeaseObligationsCurrent
|
2000000 | USD |
| CY2017Q4 | us-gaap |
Capital Leased Assets Gross
CapitalLeasedAssetsGross
|
57000000 | USD |
| CY2017Q4 | us-gaap |
Capital Leases Future Minimum Payments Due
CapitalLeasesFutureMinimumPaymentsDue
|
102000000 | USD |
| CY2015 | us-gaap |
Capital Lease Obligations Incurred
CapitalLeaseObligationsIncurred
|
0 | USD |
| CY2016 | us-gaap |
Capital Lease Obligations Incurred
CapitalLeaseObligationsIncurred
|
78000000 | USD |
| CY2017 | us-gaap |
Capital Lease Obligations Incurred
CapitalLeaseObligationsIncurred
|
87000000 | USD |
| CY2017Q4 | us-gaap |
Capital Leases Future Minimum Payments Due Current
CapitalLeasesFutureMinimumPaymentsDueCurrent
|
7000000 | USD |
| CY2017Q4 | us-gaap |
Capital Leases Future Minimum Payments Due In Five Years
CapitalLeasesFutureMinimumPaymentsDueInFiveYears
|
5000000 | USD |
| CY2017Q4 | us-gaap |
Capital Leases Future Minimum Payments Due In Four Years
CapitalLeasesFutureMinimumPaymentsDueInFourYears
|
6000000 | USD |
| CY2017Q4 | us-gaap |
Capital Leases Future Minimum Payments Due In Three Years
CapitalLeasesFutureMinimumPaymentsDueInThreeYears
|
6000000 | USD |
| CY2017Q4 | us-gaap |
Capital Leases Future Minimum Payments Due In Two Years
CapitalLeasesFutureMinimumPaymentsDueInTwoYears
|
6000000 | USD |
| CY2017Q4 | us-gaap |
Capital Leases Future Minimum Payments Due Thereafter
CapitalLeasesFutureMinimumPaymentsDueThereafter
|
72000000 | USD |
| CY2017Q4 | us-gaap |
Capital Leases Future Minimum Payments Interest Included In Payments
CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments
|
51000000 | USD |
| CY2017Q4 | us-gaap |
Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments
CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments
|
51000000 | USD |
| CY2017Q4 | us-gaap |
Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation
CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation
|
6000000 | USD |
| CY2014Q4 | us-gaap |
Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
|
127000000 | USD |
| CY2015Q4 | us-gaap |
Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
|
4000000 | USD |
| CY2016Q4 | us-gaap |
Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
|
6000000 | USD |
| CY2017Q4 | us-gaap |
Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
|
39000000 | USD |
| CY2015 | us-gaap |
Cash And Cash Equivalents Period Increase Decrease
CashAndCashEquivalentsPeriodIncreaseDecrease
|
-123000000 | USD |
| CY2016 | us-gaap |
Cash And Cash Equivalents Period Increase Decrease
CashAndCashEquivalentsPeriodIncreaseDecrease
|
2000000 | USD |
| CY2017 | us-gaap |
Cash And Cash Equivalents Period Increase Decrease
CashAndCashEquivalentsPeriodIncreaseDecrease
|
33000000 | USD |
| CY2017Q4 | us-gaap |
Collateral Already Posted Aggregate Fair Value
CollateralAlreadyPostedAggregateFairValue
|
31000000 | USD |
| CY2017Q4 | us-gaap |
Commercial Paper
CommercialPaper
|
0 | USD |
| CY2016Q4 | us-gaap |
Commitments And Contingencies
CommitmentsAndContingencies
|
USD | |
| CY2017Q4 | us-gaap |
Commitments And Contingencies
CommitmentsAndContingencies
|
USD | |
| CY2015 | us-gaap |
Common Stock Dividends Per Share Declared
CommonStockDividendsPerShareDeclared
|
1.18 | |
| CY2016 | us-gaap |
Common Stock Dividends Per Share Declared
CommonStockDividendsPerShareDeclared
|
1.26 | |
| CY2017 | us-gaap |
Common Stock Dividends Per Share Declared
CommonStockDividendsPerShareDeclared
|
1.34 | |
| CY2016Q4 | us-gaap |
Common Stock No Par Value
CommonStockNoParValue
|
0 | |
| CY2017Q4 | us-gaap |
Common Stock No Par Value
CommonStockNoParValue
|
0 | |
| CY2016Q4 | us-gaap |
Common Stock Shares Authorized
CommonStockSharesAuthorized
|
160000000 | shares |
| CY2017Q4 | us-gaap |
Common Stock Shares Authorized
CommonStockSharesAuthorized
|
160000000 | shares |
| CY2016Q4 | us-gaap |
Common Stock Shares Issued
CommonStockSharesIssued
|
88946704 | shares |
| CY2017Q4 | us-gaap |
Common Stock Shares Issued
CommonStockSharesIssued
|
89114265 | shares |
| CY2016Q4 | us-gaap |
Common Stock Shares Outstanding
CommonStockSharesOutstanding
|
88946704 | shares |
| CY2017Q4 | us-gaap |
Common Stock Shares Outstanding
CommonStockSharesOutstanding
|
89114265 | shares |
| CY2016Q4 | us-gaap |
Common Stock Value
CommonStockValue
|
1201000000 | USD |
| CY2017Q4 | us-gaap |
Common Stock Value
CommonStockValue
|
1207000000 | USD |
| CY2015 | us-gaap |
Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest
ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
|
171000000 | USD |
| CY2016 | us-gaap |
Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest
ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
|
194000000 | USD |
| CY2017 | us-gaap |
Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest
ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
|
186000000 | USD |
| CY2017Q4 | us-gaap |
Contractual Obligation
ContractualObligation
|
318000000 | USD |
| CY2017Q4 | us-gaap |
Contractual Obligation Due After Fifth Year
ContractualObligationDueAfterFifthYear
|
260000000 | USD |
| CY2017Q4 | us-gaap |
Contractual Obligation Due In Fifth Year
ContractualObligationDueInFifthYear
|
14000000 | USD |
| CY2017Q4 | us-gaap |
Contractual Obligation Due In Fourth Year
ContractualObligationDueInFourthYear
|
14000000 | USD |
| CY2017Q4 | us-gaap |
Contractual Obligation Due In Next Twelve Months
ContractualObligationDueInNextTwelveMonths
|
0 | USD |
| CY2017Q4 | us-gaap |
Contractual Obligation Due In Second Year
ContractualObligationDueInSecondYear
|
15000000 | USD |
| CY2017Q4 | us-gaap |
Contractual Obligation Due In Third Year
ContractualObligationDueInThirdYear
|
15000000 | USD |
| CY2015 | us-gaap |
Cost Of Purchased Power
CostOfPurchasedPower
|
661000000 | USD |
| CY2016 | us-gaap |
Cost Of Purchased Power
CostOfPurchasedPower
|
617000000 | USD |
| CY2017 | us-gaap |
Cost Of Purchased Power
CostOfPurchasedPower
|
592000000 | USD |
| CY2015 | us-gaap |
Costs And Expenses
CostsAndExpenses
|
1589000000 | USD |
| CY2016 | us-gaap |
Costs And Expenses
CostsAndExpenses
|
1590000000 | USD |
| CY2017 | us-gaap |
Costs And Expenses
CostsAndExpenses
|
1633000000 | USD |
| CY2015 | us-gaap |
Current Federal Tax Expense Benefit
CurrentFederalTaxExpenseBenefit
|
4000000 | USD |
| CY2016 | us-gaap |
Current Federal Tax Expense Benefit
CurrentFederalTaxExpenseBenefit
|
10000000 | USD |
| CY2017 | us-gaap |
Current Federal Tax Expense Benefit
CurrentFederalTaxExpenseBenefit
|
4000000 | USD |
| CY2015 | us-gaap |
Current Income Tax Expense Benefit
CurrentIncomeTaxExpenseBenefit
|
5000000 | USD |
| CY2016 | us-gaap |
Current Income Tax Expense Benefit
CurrentIncomeTaxExpenseBenefit
|
13000000 | USD |
| CY2017 | us-gaap |
Current Income Tax Expense Benefit
CurrentIncomeTaxExpenseBenefit
|
16000000 | USD |
| CY2015 | us-gaap |
Current State And Local Tax Expense Benefit
CurrentStateAndLocalTaxExpenseBenefit
|
1000000 | USD |
| CY2016 | us-gaap |
Current State And Local Tax Expense Benefit
CurrentStateAndLocalTaxExpenseBenefit
|
3000000 | USD |
| CY2017 | us-gaap |
Current State And Local Tax Expense Benefit
CurrentStateAndLocalTaxExpenseBenefit
|
12000000 | USD |
| CY2017Q4 | us-gaap |
Customer Refund Liability Current
CustomerRefundLiabilityCurrent
|
3000000 | USD |
| CY2017 | us-gaap |
Debt Instrument Covenant Description
DebtInstrumentCovenantDescription
|
.65 | |
| CY2017Q3 | us-gaap |
Debt Instrument Face Amount
DebtInstrumentFaceAmount
|
50000000 | USD |
| CY2017Q4 | us-gaap |
Debt Instrument Face Amount
DebtInstrumentFaceAmount
|
75000000 | USD |
| CY2017Q4 | us-gaap |
Debt Instrument Face Amount
DebtInstrumentFaceAmount
|
25000000 | USD |
| CY2017Q4 | us-gaap |
Debt Instrument Interest Rate Stated Percentage
DebtInstrumentInterestRateStatedPercentage
|
0.0398 | |
| CY2016Q4 | us-gaap |
Debt Instrument Unamortized Discount
DebtInstrumentUnamortizedDiscount
|
11000000 | USD |
| CY2017Q4 | us-gaap |
Debt Instrument Unamortized Discount
DebtInstrumentUnamortizedDiscount
|
10000000 | USD |
| CY2016Q4 | us-gaap |
Debt Weighted Average Interest Rate
DebtWeightedAverageInterestRate
|
0.0486 | |
| CY2017Q4 | us-gaap |
Debt Weighted Average Interest Rate
DebtWeightedAverageInterestRate
|
0.0503 | |
| CY2016Q4 | us-gaap |
Decommissioning Trust Assets Amount
DecommissioningTrustAssetsAmount
|
41000000 | USD |
| CY2017Q4 | us-gaap |
Decommissioning Trust Assets Amount
DecommissioningTrustAssetsAmount
|
42000000 | USD |
| CY2016Q2 | us-gaap |
Deferred Costs Leasing Accumulated Amortization
DeferredCostsLeasingAccumulatedAmortization
|
2000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Costs Leasing Accumulated Amortization
DeferredCostsLeasingAccumulatedAmortization
|
1000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Costs Leasing Accumulated Amortization
DeferredCostsLeasingAccumulatedAmortization
|
3000000 | USD |
| CY2015 | us-gaap |
Deferred Federal Income Tax Expense Benefit
DeferredFederalIncomeTaxExpenseBenefit
|
26000000 | USD |
| CY2016 | us-gaap |
Deferred Federal Income Tax Expense Benefit
DeferredFederalIncomeTaxExpenseBenefit
|
23000000 | USD |
| CY2017 | us-gaap |
Deferred Federal Income Tax Expense Benefit
DeferredFederalIncomeTaxExpenseBenefit
|
61000000 | USD |
| CY2015 | us-gaap |
Deferred Income Tax Expense Benefit
DeferredIncomeTaxExpenseBenefit
|
40000000 | USD |
| CY2016 | us-gaap |
Deferred Income Tax Expense Benefit
DeferredIncomeTaxExpenseBenefit
|
37000000 | USD |
| CY2017 | us-gaap |
Deferred Income Tax Expense Benefit
DeferredIncomeTaxExpenseBenefit
|
70000000 | USD |
| CY2015 | us-gaap |
Deferred State And Local Income Tax Expense Benefit
DeferredStateAndLocalIncomeTaxExpenseBenefit
|
14000000 | USD |
| CY2016 | us-gaap |
Deferred State And Local Income Tax Expense Benefit
DeferredStateAndLocalIncomeTaxExpenseBenefit
|
14000000 | USD |
| CY2017 | us-gaap |
Deferred State And Local Income Tax Expense Benefit
DeferredStateAndLocalIncomeTaxExpenseBenefit
|
9000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Assets Net
DeferredTaxAssetsNet
|
330000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Assets Net
DeferredTaxAssetsNet
|
252000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Assets Valuation Allowance
DeferredTaxAssetsValuationAllowance
|
0 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Liabilities
DeferredTaxLiabilities
|
669000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Liabilities
DeferredTaxLiabilities
|
376000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Liabilities Gross Noncurrent
DeferredTaxLiabilitiesGrossNoncurrent
|
999000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Liabilities Gross Noncurrent
DeferredTaxLiabilitiesGrossNoncurrent
|
628000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Assets Regulatory Assets And Liabilities
DeferredTaxAssetsRegulatoryAssetsAndLiabilities
|
29000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Assets Regulatory Assets And Liabilities
DeferredTaxAssetsRegulatoryAssetsAndLiabilities
|
14000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits
DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
|
181000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits
DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
|
128000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Assets Tax Deferred Expense Other
DeferredTaxAssetsTaxDeferredExpenseOther
|
5000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Assets Tax Deferred Expense Other
DeferredTaxAssetsTaxDeferredExpenseOther
|
4000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Assets Valuation Allowance
DeferredTaxAssetsValuationAllowance
|
0 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Liabilities Noncurrent
DeferredTaxLiabilitiesNoncurrent
|
669000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Liabilities Noncurrent
DeferredTaxLiabilitiesNoncurrent
|
376000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Liabilities Other
DeferredTaxLiabilitiesOther
|
0 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Liabilities Other
DeferredTaxLiabilitiesOther
|
0 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Liabilities Property Plant And Equipment
DeferredTaxLiabilitiesPropertyPlantAndEquipment
|
829000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Liabilities Property Plant And Equipment
DeferredTaxLiabilitiesPropertyPlantAndEquipment
|
496000000 | USD |
| CY2016Q4 | us-gaap |
Deferred Tax Liabilities Regulatory Assets
DeferredTaxLiabilitiesRegulatoryAssets
|
170000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Liabilities Regulatory Assets
DeferredTaxLiabilitiesRegulatoryAssets
|
132000000 | USD |
| CY2017Q4 | us-gaap |
Deferred Tax Liabilities Regulatory Assets And Liabilities
DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities
|
340000000 | USD |
| CY2015 | us-gaap |
Defined Benefit Plan Description Of Direction And Pattern Of Change For Assumed Health Care Cost Trend Rate
DefinedBenefitPlanDescriptionOfDirectionAndPatternOfChangeForAssumedHealthCareCostTrendRate
|
0.06 | |
| CY2016 | us-gaap |
Defined Benefit Plan Description Of Direction And Pattern Of Change For Assumed Health Care Cost Trend Rate
DefinedBenefitPlanDescriptionOfDirectionAndPatternOfChangeForAssumedHealthCareCostTrendRate
|
0.065 | |
| CY2017 | us-gaap |
Defined Benefit Plan Description Of Direction And Pattern Of Change For Assumed Health Care Cost Trend Rate
DefinedBenefitPlanDescriptionOfDirectionAndPatternOfChangeForAssumedHealthCareCostTrendRate
|
0.06 | |
| CY2017 | us-gaap |
Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components
DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents
|
0 | USD |
| CY2017Q4 | us-gaap |
Defined Benefit Plan Expected Amortization Next Fiscal Year
DefinedBenefitPlanExpectedAmortizationNextFiscalYear
|
18000000 | USD |
| CY2017Q4 | us-gaap |
Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter
DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
|
266000000 | USD |
| CY2017Q4 | us-gaap |
Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months
DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
|
46000000 | USD |
| CY2017Q4 | us-gaap |
Defined Benefit Plan Expected Future Benefit Payments Year Five
DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
|
51000000 | USD |
| CY2017Q4 | us-gaap |
Defined Benefit Plan Expected Future Benefit Payments Year Four
DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
|
49000000 | USD |
| CY2017Q4 | us-gaap |
Defined Benefit Plan Expected Future Benefit Payments Year Three
DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
|
49000000 | USD |
| CY2017Q4 | us-gaap |
Defined Benefit Plan Expected Future Benefit Payments Year Two
DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
|
49000000 | USD |
| CY2017Q4 | us-gaap |
Defined Benefit Plan Expected Future Employer Contributions Next Fiscal Year
DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
|
21000000 | USD |
| CY2016Q4 | us-gaap |
Defined Benefit Plan Fair Value Of Plan Assets
DefinedBenefitPlanFairValueOfPlanAssets
|
559000000 | USD |
| CY2015Q4 | us-gaap |
Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year
DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
|
0.0025 | |
| CY2016Q4 | us-gaap |
Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year
DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
|
0.0025 | |
| CY2017Q4 | us-gaap |
Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year
DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
|
0.0025 | |
| CY2017 | us-gaap |
Defined Benefit Plan Interest Cost
DefinedBenefitPlanInterestCost
|
3000000 | USD |
| CY2015Q4 | us-gaap |
Defined Benefit Plan Ultimate Health Care Cost Trend Rate1
DefinedBenefitPlanUltimateHealthCareCostTrendRate1
|
0.05 | |
| CY2016Q4 | us-gaap |
Defined Benefit Plan Ultimate Health Care Cost Trend Rate1
DefinedBenefitPlanUltimateHealthCareCostTrendRate1
|
0.05 | |
| CY2017Q4 | us-gaap |
Defined Benefit Plan Ultimate Health Care Cost Trend Rate1
DefinedBenefitPlanUltimateHealthCareCostTrendRate1
|
0.05 | |
| CY2015 | us-gaap |
Defined Contribution Plan Employer Discretionary Contribution Amount
DefinedContributionPlanEmployerDiscretionaryContributionAmount
|
17000000 | USD |
| CY2016 | us-gaap |
Defined Contribution Plan Employer Discretionary Contribution Amount
DefinedContributionPlanEmployerDiscretionaryContributionAmount
|
19000000 | USD |
| CY2017 | us-gaap |
Defined Contribution Plan Employer Discretionary Contribution Amount
DefinedContributionPlanEmployerDiscretionaryContributionAmount
|
21000000 | USD |
| CY2016 | us-gaap |
Effective Income Tax Rate Reconciliation State And Local Income Taxes
EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
|
0.048 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Reconciliation State And Local Income Taxes
EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
|
0.050 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Reconciliation Tax Credits Other
EffectiveIncomeTaxRateReconciliationTaxCreditsOther
|
0.190 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Reconciliation Tax Credits Other
EffectiveIncomeTaxRateReconciliationTaxCreditsOther
|
0.182 | |
| CY2017Q4 | us-gaap |
Deposit Assets
DepositAssets
|
0 | USD |
| CY2015 | us-gaap |
Depreciation Depletion And Amortization
DepreciationDepletionAndAmortization
|
305000000 | USD |
| CY2016 | us-gaap |
Depreciation Depletion And Amortization
DepreciationDepletionAndAmortization
|
321000000 | USD |
| CY2017 | us-gaap |
Depreciation Depletion And Amortization
DepreciationDepletionAndAmortization
|
345000000 | USD |
| CY2016Q4 | us-gaap |
Derivative Assets Noncurrent
DerivativeAssetsNoncurrent
|
5000000 | USD |
| CY2017Q4 | us-gaap |
Derivative Assets Noncurrent
DerivativeAssetsNoncurrent
|
0 | USD |
| CY2016Q4 | us-gaap |
Derivative Collateral Right To Reclaim Cash
DerivativeCollateralRightToReclaimCash
|
11000000 | USD |
| CY2017Q4 | us-gaap |
Derivative Collateral Right To Reclaim Cash
DerivativeCollateralRightToReclaimCash
|
11000000 | USD |
| CY2016Q4 | us-gaap |
Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral
DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
|
115000000 | USD |
| CY2017Q4 | us-gaap |
Derivative Fair Value Of Derivative Liability Amount Not Offset Against Collateral
DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
|
136000000 | USD |
| CY2016Q4 | us-gaap |
Derivative Liabilities Current
DerivativeLiabilitiesCurrent
|
44000000 | USD |
| CY2017Q4 | us-gaap |
Derivative Liabilities Current
DerivativeLiabilitiesCurrent
|
59000000 | USD |
| CY2016Q4 | us-gaap |
Derivative Liabilities Noncurrent
DerivativeLiabilitiesNoncurrent
|
125000000 | USD |
| CY2017Q4 | us-gaap |
Derivative Liabilities Noncurrent
DerivativeLiabilitiesNoncurrent
|
151000000 | USD |
| CY2017Q4 | us-gaap |
Derivative Net Liability Position Aggregate Fair Value
DerivativeNetLiabilityPositionAggregateFairValue
|
205000000 | USD |
| CY2015 | us-gaap |
Dividends Common Stock
DividendsCommonStock
|
102000000 | USD |
| CY2016 | us-gaap |
Dividends Common Stock
DividendsCommonStock
|
113000000 | USD |
| CY2017 | us-gaap |
Dividends Common Stock
DividendsCommonStock
|
120000000 | USD |
| CY2016Q4 | us-gaap |
Dividends Payable Current
DividendsPayableCurrent
|
30000000 | USD |
| CY2017Q4 | us-gaap |
Dividends Payable Current
DividendsPayableCurrent
|
31000000 | USD |
| CY2015Q4 | us-gaap |
Dividends Payable Current And Noncurrent
DividendsPayableCurrentAndNoncurrent
|
28000000 | USD |
| CY2016Q4 | us-gaap |
Dividends Payable Current And Noncurrent
DividendsPayableCurrentAndNoncurrent
|
30000000 | USD |
| CY2017Q4 | us-gaap |
Dividends Payable Current And Noncurrent
DividendsPayableCurrentAndNoncurrent
|
31000000 | USD |
| CY2015 | us-gaap |
Earnings Per Share Basic
EarningsPerShareBasic
|
2.05 | |
| CY2016 | us-gaap |
Earnings Per Share Basic
EarningsPerShareBasic
|
2.17 | |
| CY2017 | us-gaap |
Earnings Per Share Basic
EarningsPerShareBasic
|
2.10 | |
| CY2015 | us-gaap |
Earnings Per Share Diluted
EarningsPerShareDiluted
|
2.04 | |
| CY2016 | us-gaap |
Earnings Per Share Diluted
EarningsPerShareDiluted
|
2.16 | |
| CY2017 | us-gaap |
Earnings Per Share Diluted
EarningsPerShareDiluted
|
2.10 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Continuing Operations
EffectiveIncomeTaxRateContinuingOperations
|
0.207 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Continuing Operations
EffectiveIncomeTaxRateContinuingOperations
|
0.206 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Continuing Operations
EffectiveIncomeTaxRateContinuingOperations
|
0.315 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
|
0.350 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
|
0.350 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
|
0.350 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance
EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
|
0.000 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance
EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
|
0.000 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance
EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
|
0.061 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation
EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation
|
0.000 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation
EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation
|
0.002 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation
EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation
|
0.015 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Reconciliation Other Adjustments
EffectiveIncomeTaxRateReconciliationOtherAdjustments
|
0.005 | |
| CY2016 | us-gaap |
Effective Income Tax Rate Reconciliation Other Adjustments
EffectiveIncomeTaxRateReconciliationOtherAdjustments
|
-0.012 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Reconciliation Other Adjustments
EffectiveIncomeTaxRateReconciliationOtherAdjustments
|
-0.021 | |
| CY2015 | us-gaap |
Effective Income Tax Rate Reconciliation State And Local Income Taxes
EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
|
0.042 | |
| CY2017 | us-gaap |
Effective Income Tax Rate Reconciliation Tax Credits Other
EffectiveIncomeTaxRateReconciliationTaxCreditsOther
|
0.140 | |
| CY2015 | us-gaap |
Electric Production Expense
ElectricProductionExpense
|
266000000 | USD |
| CY2016 | us-gaap |
Electric Production Expense
ElectricProductionExpense
|
286000000 | USD |
| CY2017 | us-gaap |
Electric Production Expense
ElectricProductionExpense
|
309000000 | USD |
| CY2015 | us-gaap |
Electric Utility Revenue
ElectricUtilityRevenue
|
1898000000 | USD |
| CY2016 | us-gaap |
Electric Utility Revenue
ElectricUtilityRevenue
|
1923000000 | USD |
| CY2017 | us-gaap |
Electric Utility Revenue
ElectricUtilityRevenue
|
2009000000 | USD |
| CY2016Q4 | us-gaap |
Employee Related Liabilities Current
EmployeeRelatedLiabilitiesCurrent
|
52000000 | USD |
| CY2017Q4 | us-gaap |
Employee Related Liabilities Current
EmployeeRelatedLiabilitiesCurrent
|
60000000 | USD |
| CY2015 | us-gaap |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount
EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
|
0 | USD |
| CY2016 | us-gaap |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount
EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
|
0 | USD |
| CY2017 | us-gaap |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount
EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
|
0 | USD |
| CY2017Q4 | us-gaap |
Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized
EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
|
7000000 | USD |
| CY2016Q4 | us-gaap |
Energy Related Inventory
EnergyRelatedInventory
|
32000000 | USD |
| CY2017Q4 | us-gaap |
Energy Related Inventory
EnergyRelatedInventory
|
26000000 | USD |
| CY2016 | us-gaap |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
|
1000000 | USD |
| CY2016 | us-gaap |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
|
1000000 | USD |
| CY2017 | us-gaap |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Into Level3
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
|
0 | USD |
| CY2016 | us-gaap |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
|
0 | USD |
| CY2017 | us-gaap |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet
|
0 | USD |
| CY2016 | us-gaap |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
|
10000000 | USD |
| CY2017 | us-gaap |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Out Of Level3
FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
|
15000000 | USD |
| CY2016Q4 | us-gaap |
Financial Instruments Owned At Fair Value
FinancialInstrumentsOwnedAtFairValue
|
23000000 | USD |
| CY2017Q4 | us-gaap |
Financial Instruments Owned At Fair Value
FinancialInstrumentsOwnedAtFairValue
|
25000000 | USD |
| CY2016Q4 | us-gaap |
Finite Lived Intangible Assets Accumulated Amortization
FiniteLivedIntangibleAssetsAccumulatedAmortization
|
257000000 | USD |
| CY2017Q4 | us-gaap |
Finite Lived Intangible Assets Accumulated Amortization
FiniteLivedIntangibleAssetsAccumulatedAmortization
|
296000000 | USD |
| CY2017Q4 | us-gaap |
Finite Lived Intangible Assets Amortization Expense Next Twelve Months
FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
|
49000000 | USD |
| CY2017Q4 | us-gaap |
Finite Lived Intangible Assets Amortization Expense Year Five
FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
|
28000000 | USD |
| CY2017Q4 | us-gaap |
Finite Lived Intangible Assets Amortization Expense Year Four
FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
|
35000000 | USD |
| CY2017Q4 | us-gaap |
Finite Lived Intangible Assets Amortization Expense Year Three
FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
|
43000000 | USD |
| CY2017Q4 | us-gaap |
Finite Lived Intangible Assets Amortization Expense Year Two
FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
|
48000000 | USD |
| CY2017Q4 | us-gaap |
Gain Contingency Unrecorded Amount
GainContingencyUnrecordedAmount
|
200000000 | USD |
| CY2015 | us-gaap |
Gain Loss On Contract Termination
GainLossOnContractTermination
|
2000000 | USD |
| CY2016 | us-gaap |
Gain Loss On Contract Termination
GainLossOnContractTermination
|
2000000 | USD |
| CY2015 | us-gaap |
General And Administrative Expense
GeneralAndAdministrativeExpense
|
241000000 | USD |
| CY2016 | us-gaap |
General And Administrative Expense
GeneralAndAdministrativeExpense
|
247000000 | USD |
| CY2017 | us-gaap |
General And Administrative Expense
GeneralAndAdministrativeExpense
|
264000000 | USD |
| CY2015 | us-gaap |
Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
|
217000000 | USD |
| CY2016 | us-gaap |
Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
|
243000000 | USD |
| CY2017 | us-gaap |
Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
|
273000000 | USD |
| CY2015 | us-gaap |
Income Tax Expense Benefit
IncomeTaxExpenseBenefit
|
45000000 | USD |
| CY2016 | us-gaap |
Income Tax Expense Benefit
IncomeTaxExpenseBenefit
|
50000000 | USD |
| CY2017 | us-gaap |
Income Tax Expense Benefit
IncomeTaxExpenseBenefit
|
86000000 | USD |
| CY2017 | us-gaap |
Income Tax Expense Benefit Continuing Operations Adjustment Of Deferred Tax Asset Liability
IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability
|
17000000 | USD |
| CY2015 | us-gaap |
Income Taxes Paid
IncomeTaxesPaid
|
3000000 | USD |
| CY2016 | us-gaap |
Income Taxes Paid
IncomeTaxesPaid
|
16000000 | USD |
| CY2017 | us-gaap |
Income Taxes Paid
IncomeTaxesPaid
|
18000000 | USD |
| CY2015 | us-gaap |
Increase Decrease In Accounts Payable
IncreaseDecreaseInAccountsPayable
|
6000000 | USD |
| CY2016 | us-gaap |
Increase Decrease In Accounts Payable
IncreaseDecreaseInAccountsPayable
|
15000000 | USD |
| CY2017 | us-gaap |
Increase Decrease In Accounts Payable
IncreaseDecreaseInAccountsPayable
|
5000000 | USD |
| CY2015 | us-gaap |
Increase Decrease In Customer Advances And Deposits
IncreaseDecreaseInCustomerAdvancesAndDeposits
|
1000000 | USD |
| CY2016 | us-gaap |
Increase Decrease In Customer Advances And Deposits
IncreaseDecreaseInCustomerAdvancesAndDeposits
|
6000000 | USD |
| CY2015 | us-gaap |
Increase Decrease In Deferred Compensation
IncreaseDecreaseInDeferredCompensation
|
-9000000 | USD |
| CY2016 | us-gaap |
Increase Decrease In Deferred Compensation
IncreaseDecreaseInDeferredCompensation
|
-10000000 | USD |
| CY2017 | us-gaap |
Increase Decrease In Deferred Compensation
IncreaseDecreaseInDeferredCompensation
|
-8000000 | USD |
| CY2015 | us-gaap |
Increase Decrease In Margin Deposits Outstanding
IncreaseDecreaseInMarginDepositsOutstanding
|
22000000 | USD |
| CY2016 | us-gaap |
Increase Decrease In Margin Deposits Outstanding
IncreaseDecreaseInMarginDepositsOutstanding
|
-25000000 | USD |
| CY2017 | us-gaap |
Increase Decrease In Margin Deposits Outstanding
IncreaseDecreaseInMarginDepositsOutstanding
|
3000000 | USD |
| CY2015 | us-gaap |
Increase Decrease In Other Operating Assets
IncreaseDecreaseInOtherOperatingAssets
|
12000000 | USD |
| CY2016 | us-gaap |
Increase Decrease In Other Operating Assets
IncreaseDecreaseInOtherOperatingAssets
|
28000000 | USD |
| CY2017 | us-gaap |
Increase Decrease In Other Operating Assets
IncreaseDecreaseInOtherOperatingAssets
|
18000000 | USD |
| CY2015 | us-gaap |
Increase Decrease In Other Operating Capital Net
IncreaseDecreaseInOtherOperatingCapitalNet
|
4000000 | USD |
| CY2016 | us-gaap |
Increase Decrease In Other Operating Capital Net
IncreaseDecreaseInOtherOperatingCapitalNet
|
4000000 | USD |
| CY2017 | us-gaap |
Increase Decrease In Other Operating Capital Net
IncreaseDecreaseInOtherOperatingCapitalNet
|
-1000000 | USD |
| CY2015 | us-gaap |
Increase Decrease In Other Receivables
IncreaseDecreaseInOtherReceivables
|
-23000000 | USD |
| CY2016 | us-gaap |
Increase Decrease In Other Receivables
IncreaseDecreaseInOtherReceivables
|
0 | USD |
| CY2017 | us-gaap |
Increase Decrease In Other Receivables
IncreaseDecreaseInOtherReceivables
|
0 | USD |
| CY2015 | us-gaap |
Increase Decrease In Receivables
IncreaseDecreaseInReceivables
|
11000000 | USD |
| CY2016 | us-gaap |
Increase Decrease In Receivables
IncreaseDecreaseInReceivables
|
9000000 | USD |
| CY2017 | us-gaap |
Increase Decrease In Receivables
IncreaseDecreaseInReceivables
|
3000000 | USD |
| CY2015 | us-gaap |
Interest Expense
InterestExpense
|
114000000 | USD |
| CY2016 | us-gaap |
Interest Expense
InterestExpense
|
112000000 | USD |
| CY2017 | us-gaap |
Interest Expense
InterestExpense
|
120000000 | USD |
| us-gaap |
Interest Expense Lessee Assets Under Capital Lease
InterestExpenseLesseeAssetsUnderCapitalLease
|
3000000 | USD | |
| CY2016 | us-gaap |
Interest Expense Lessee Assets Under Capital Lease
InterestExpenseLesseeAssetsUnderCapitalLease
|
2000000 | USD |
| CY2017 | us-gaap |
Interest Expense Lessee Assets Under Capital Lease
InterestExpenseLesseeAssetsUnderCapitalLease
|
4000000 | USD |
| CY2015 | us-gaap |
Interest Paid Net
InterestPaidNet
|
108000000 | USD |
| CY2016 | us-gaap |
Interest Paid Net
InterestPaidNet
|
104000000 | USD |
| CY2017 | us-gaap |
Interest Paid Net
InterestPaidNet
|
110000000 | USD |
| CY2016Q4 | us-gaap |
Interest Payable Current
InterestPayableCurrent
|
25000000 | USD |
| CY2017Q4 | us-gaap |
Interest Payable Current
InterestPayableCurrent
|
27000000 | USD |
| CY2016Q4 | us-gaap |
Investments Fair Value Disclosure
InvestmentsFairValueDisclosure
|
2000000 | USD |
| CY2017Q4 | us-gaap |
Investments Fair Value Disclosure
InvestmentsFairValueDisclosure
|
0 | USD |
| CY2017Q4 | us-gaap |
Jointly Owned Utility Plant Gross Ownership Amount Of Plant In Service
JointlyOwnedUtilityPlantGrossOwnershipAmountOfPlantInService
|
1312000000 | USD |
| CY2017Q4 | us-gaap |
Jointly Owned Utility Plant Ownership Amount Of Construction Work In Progress
JointlyOwnedUtilityPlantOwnershipAmountOfConstructionWorkInProgress
|
12000000 | USD |
| CY2017Q4 | us-gaap |
Jointly Owned Utility Plant Ownership Amount Of Plant Accumulated Depreciation
JointlyOwnedUtilityPlantOwnershipAmountOfPlantAccumulatedDepreciation
|
845000000 | USD |
| CY2015 | us-gaap |
Lease And Rental Expense
LeaseAndRentalExpense
|
0 | USD |
| CY2016 | us-gaap |
Lease And Rental Expense
LeaseAndRentalExpense
|
10000000 | USD |
| CY2017 | us-gaap |
Lease And Rental Expense
LeaseAndRentalExpense
|
9000000 | USD |
| CY2016Q4 | us-gaap |
Letters Of Credit Outstanding Amount
LettersOfCreditOutstandingAmount
|
17000000 | USD |
| CY2017Q4 | us-gaap |
Letters Of Credit Outstanding Amount
LettersOfCreditOutstandingAmount
|
31000000 | USD |
| CY2016Q4 | us-gaap |
Liabilities
Liabilities
|
5183000000 | USD |
| CY2017Q4 | us-gaap |
Liabilities And Stockholders Equity
LiabilitiesAndStockholdersEquity
|
7838000000 | USD |
| CY2016Q4 | us-gaap |
Liabilities Current
LiabilitiesCurrent
|
577000000 | USD |
| CY2017Q4 | us-gaap |
Money Market Funds At Carrying Value
MoneyMarketFundsAtCarryingValue
|
25000000 | USD |
| CY2017Q4 | us-gaap |
Liabilities
Liabilities
|
5422000000 | USD |
| CY2016Q4 | us-gaap |
Liabilities And Stockholders Equity
LiabilitiesAndStockholdersEquity
|
7527000000 | USD |
| CY2017Q4 | us-gaap |
Liabilities Current
LiabilitiesCurrent
|
432000000 | USD |
| CY2016Q4 | us-gaap |
Liabilities Fair Value Disclosure
LiabilitiesFairValueDisclosure
|
169000000 | USD |
| CY2017Q4 | us-gaap |
Liabilities Fair Value Disclosure
LiabilitiesFairValueDisclosure
|
210000000 | USD |
| CY2017Q4 | us-gaap |
Liability For Title Claims And Claims Adjustment Expense
LiabilityForTitleClaimsAndClaimsAdjustmentExpense
|
8000000 | USD |
| CY2017Q4 | us-gaap |
Line Of Credit
LineOfCredit
|
0 | USD |
| CY2017 | us-gaap |
Line Of Credit Facility Commitment Fee Percentage
LineOfCreditFacilityCommitmentFeePercentage
|
0 | |
| CY2016Q4 | us-gaap |
Line Of Credit Facility Interest Rate At Period End
LineOfCreditFacilityInterestRateAtPeriodEnd
|
0.05 | |
| CY2017Q4 | us-gaap |
Line Of Credit Facility Interest Rate At Period End
LineOfCreditFacilityInterestRateAtPeriodEnd
|
0.0187 | |
| CY2016 | us-gaap |
Line Of Credit Facility Interest Rate During Period
LineOfCreditFacilityInterestRateDuringPeriod
|
0.0137 | |
| CY2017Q4 | us-gaap |
Line Of Credit Facility Maximum Borrowing Capacity
LineOfCreditFacilityMaximumBorrowingCapacity
|
500000000 | USD |
| CY2017Q4 | us-gaap |
Line Of Credit Facility Remaining Borrowing Capacity
LineOfCreditFacilityRemainingBorrowingCapacity
|
500000000 | USD |
| CY2017 | us-gaap |
Litigation Settlement Amount Awarded From Other Party
LitigationSettlementAmountAwardedFromOtherParty
|
85000000 | USD |
| CY2017 | us-gaap |
Litigation Settlement Expense
LitigationSettlementExpense
|
115000000 | USD |
| CY2016Q4 | us-gaap |
Long Term Debt
LongTermDebt
|
2361000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt
LongTermDebt
|
2436000000 | USD |
| CY2016Q4 | us-gaap |
Long Term Debt Current
LongTermDebtCurrent
|
150000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Current
LongTermDebtCurrent
|
0 | USD |
| CY2016Q4 | us-gaap |
Long Term Debt Fair Value
LongTermDebtFairValue
|
2693000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Fair Value
LongTermDebtFairValue
|
2829000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal After Year Five
LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
|
1976000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Next Twelve Months
LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
|
0 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Year Five
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
|
0 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Year Four
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
|
160000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Year Three
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
|
0 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Maturities Repayments Of Principal In Year Two
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
|
300000000 | USD |
| CY2016Q4 | us-gaap |
Long Term Debt Noncurrent
LongTermDebtNoncurrent
|
2200000000 | USD |
| CY2017Q4 | us-gaap |
Long Term Debt Noncurrent
LongTermDebtNoncurrent
|
2426000000 | USD |
| CY2017 | us-gaap |
Long Term Purchase Commitment Amount
LongTermPurchaseCommitmentAmount
|
132000000 | USD |
| CY2016Q4 | us-gaap |
Longterm Pollution Control Bond Current And Noncurrent
LongtermPollutionControlBondCurrentAndNoncurrent
|
142000000 | USD |
| CY2017Q4 | us-gaap |
Longterm Pollution Control Bond Current And Noncurrent
LongtermPollutionControlBondCurrentAndNoncurrent
|
142000000 | USD |
| CY2016Q4 | us-gaap |
Loss Contingency Accrual Carrying Value Current
LossContingencyAccrualCarryingValueCurrent
|
3000000 | USD |
| CY2017Q4 | us-gaap |
Loss Contingency Accrual Carrying Value Current
LossContingencyAccrualCarryingValueCurrent
|
14000000 | USD |
| CY2013Q3 | us-gaap |
Loss Contingency Damages Awarded Value
LossContingencyDamagesAwardedValue
|
50000000 | USD |
| CY2017 | us-gaap |
Loss Contingency Damages Sought Value
LossContingencyDamagesSoughtValue
|
1200000000 | USD |
| CY2017Q4 | us-gaap |
Loss Contingency Estimate Of Possible Loss
LossContingencyEstimateOfPossibleLoss
|
1700000000 | USD |
| CY2017Q4 | us-gaap |
Loss Contingency Range Of Possible Loss Portion Not Accrued
LossContingencyRangeOfPossibleLossPortionNotAccrued
|
500000000 | USD |
| CY2017Q3 | us-gaap |
Malpractice Loss Contingency Letters Of Credit And Surety Bonds
MalpracticeLossContingencyLettersOfCreditAndSuretyBonds
|
145600000 | USD |
| CY2016Q4 | us-gaap |
Margin Deposit Assets
MarginDepositAssets
|
8000000 | USD |
| CY2017Q4 | us-gaap |
Margin Deposit Assets
MarginDepositAssets
|
11000000 | USD |
| CY2016Q4 | us-gaap |
Money Market Funds At Carrying Value
MoneyMarketFundsAtCarryingValue
|
21000000 | USD |
| CY2017Q4 | us-gaap |
Other Investments
OtherInvestments
|
30000000 | USD |
| CY2016Q4 | us-gaap |
Other Liabilities Current
OtherLiabilitiesCurrent
|
254000000 | USD |
| CY2017Q4 | us-gaap |
Other Liabilities Current
OtherLiabilitiesCurrent
|
241000000 | USD |
| CY2016Q4 | us-gaap |
Other Liabilities Noncurrent
OtherLiabilitiesNoncurrent
|
107000000 | USD |
| CY2017Q4 | us-gaap |
Other Liabilities Noncurrent
OtherLiabilitiesNoncurrent
|
192000000 | USD |
| CY2015 | us-gaap |
Other Noncash Income Expense
OtherNoncashIncomeExpense
|
-22000000 | USD |
| CY2015 | us-gaap |
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
|
-121000000 | USD |
| CY2016 | us-gaap |
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
|
34000000 | USD |
| CY2017 | us-gaap |
Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
|
-50000000 | USD |
| CY2015 | us-gaap |
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
|
-522000000 | USD |
| CY2016 | us-gaap |
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
|
-585000000 | USD |
| CY2017 | us-gaap |
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
|
-514000000 | USD |
| CY2015 | us-gaap |
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
|
520000000 | USD |
| CY2016 | us-gaap |
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
|
553000000 | USD |
| CY2017 | us-gaap |
Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
|
597000000 | USD |
| CY2015 | us-gaap |
Nonoperating Income Expense
NonoperatingIncomeExpense
|
22000000 | USD |
| CY2016 | us-gaap |
Nonoperating Income Expense
NonoperatingIncomeExpense
|
22000000 | USD |
| CY2017 | us-gaap |
Nonoperating Income Expense
NonoperatingIncomeExpense
|
17000000 | USD |
| CY2015 | us-gaap |
Operating Income Loss
OperatingIncomeLoss
|
309000000 | USD |
| CY2016 | us-gaap |
Operating Income Loss
OperatingIncomeLoss
|
333000000 | USD |
| CY2017 | us-gaap |
Operating Income Loss
OperatingIncomeLoss
|
376000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Due
OperatingLeasesFutureMinimumPaymentsDue
|
202000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Due Current
OperatingLeasesFutureMinimumPaymentsDueCurrent
|
9000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Due In Five Years
OperatingLeasesFutureMinimumPaymentsDueInFiveYears
|
8000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Due In Four Years
OperatingLeasesFutureMinimumPaymentsDueInFourYears
|
6000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Due In Three Years
OperatingLeasesFutureMinimumPaymentsDueInThreeYears
|
6000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Due In Two Years
OperatingLeasesFutureMinimumPaymentsDueInTwoYears
|
8000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Due Thereafter
OperatingLeasesFutureMinimumPaymentsDueThereafter
|
165000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Receivable Current
OperatingLeasesFutureMinimumPaymentsReceivableCurrent
|
4000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Receivable In Five Years
OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears
|
2000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Receivable In Four Years
OperatingLeasesFutureMinimumPaymentsReceivableInFourYears
|
3000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Receivable In Three Years
OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears
|
3000000 | USD |
| CY2017Q4 | us-gaap |
Operating Leases Future Minimum Payments Receivable In Two Years
OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears
|
3000000 | USD |
| CY2015 | us-gaap |
Operating Leases Rent Expense Sublease Rentals1
OperatingLeasesRentExpenseSubleaseRentals1
|
3000000 | USD |
| CY2016 | us-gaap |
Operating Leases Rent Expense Sublease Rentals1
OperatingLeasesRentExpenseSubleaseRentals1
|
4000000 | USD |
| CY2017 | us-gaap |
Operating Leases Rent Expense Sublease Rentals1
OperatingLeasesRentExpenseSubleaseRentals1
|
4000000 | USD |
| CY2016Q4 | us-gaap |
Other Assets Current
OtherAssetsCurrent
|
77000000 | USD |
| CY2017Q4 | us-gaap |
Other Assets Current
OtherAssetsCurrent
|
73000000 | USD |
| CY2016Q4 | us-gaap |
Other Assets Miscellaneous
OtherAssetsMiscellaneous
|
3000000 | USD |
| CY2017Q4 | us-gaap |
Other Assets Miscellaneous
OtherAssetsMiscellaneous
|
6000000 | USD |
| CY2016Q4 | us-gaap |
Other Assets Noncurrent
OtherAssetsNoncurrent
|
57000000 | USD |
| CY2017Q4 | us-gaap |
Other Assets Noncurrent
OtherAssetsNoncurrent
|
54000000 | USD |
| CY2015 | us-gaap |
Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax
OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
|
-1000000 | USD |
| CY2016 | us-gaap |
Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax
OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
|
1000000 | USD |
| CY2017 | us-gaap |
Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax
OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
|
-1000000 | USD |
| CY2015 | us-gaap |
Other Comprehensive Income Loss Net Of Tax
OtherComprehensiveIncomeLossNetOfTax
|
-1000000 | USD |
| CY2016 | us-gaap |
Other Comprehensive Income Loss Net Of Tax
OtherComprehensiveIncomeLossNetOfTax
|
1000000 | USD |
| CY2017 | us-gaap |
Other Comprehensive Income Loss Net Of Tax
OtherComprehensiveIncomeLossNetOfTax
|
-1000000 | USD |
| CY2016Q4 | us-gaap |
Other Inventory Supplies
OtherInventorySupplies
|
50000000 | USD |
| CY2017Q4 | us-gaap |
Other Inventory Supplies
OtherInventorySupplies
|
52000000 | USD |
| CY2016Q4 | us-gaap |
Other Investments
OtherInvestments
|
1000000 | USD |
| CY2017Q3 | us-gaap |
Public Utilities Property Plant And Equipment Other Property Plant And Equipment
PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyPlantAndEquipment
|
637000000 | USD |
| CY2016 | us-gaap |
Other Noncash Income Expense
OtherNoncashIncomeExpense
|
-7000000 | USD |
| CY2017 | us-gaap |
Other Noncash Income Expense
OtherNoncashIncomeExpense
|
-29000000 | USD |
| CY2015 | us-gaap |
Other Nonoperating Income Expense
OtherNonoperatingIncomeExpense
|
1000000 | USD |
| CY2016 | us-gaap |
Other Nonoperating Income Expense
OtherNonoperatingIncomeExpense
|
1000000 | USD |
| CY2017 | us-gaap |
Other Nonoperating Income Expense
OtherNonoperatingIncomeExpense
|
5000000 | USD |
| CY2016Q4 | us-gaap |
Other Postretirement Defined Benefit Plan Liabilities Noncurrent
OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent
|
105000000 | USD |
| CY2017Q4 | us-gaap |
Other Postretirement Defined Benefit Plan Liabilities Noncurrent
OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent
|
106000000 | USD |
| CY2015 | us-gaap |
Payments For Proceeds From Investments
PaymentsForProceedsFromInvestments
|
-50000000 | USD |
| CY2016 | us-gaap |
Payments For Proceeds From Investments
PaymentsForProceedsFromInvestments
|
0 | USD |
| CY2017 | us-gaap |
Payments For Proceeds From Investments
PaymentsForProceedsFromInvestments
|
0 | USD |
| CY2015 | us-gaap |
Payments For Proceeds From Other Investing Activities
PaymentsForProceedsFromOtherInvestingActivities
|
0 | USD |
| CY2016 | us-gaap |
Payments For Proceeds From Other Investing Activities
PaymentsForProceedsFromOtherInvestingActivities
|
3000000 | USD |
| CY2017 | us-gaap |
Payments For Proceeds From Other Investing Activities
PaymentsForProceedsFromOtherInvestingActivities
|
3000000 | USD |
| CY2015 | us-gaap |
Payments Of Dividends
PaymentsOfDividends
|
97000000 | USD |
| CY2016 | us-gaap |
Payments Of Dividends
PaymentsOfDividends
|
110000000 | USD |
| CY2017 | us-gaap |
Payments Of Dividends
PaymentsOfDividends
|
118000000 | USD |
| CY2015 | us-gaap |
Payments To Acquire Property Plant And Equipment
PaymentsToAcquirePropertyPlantAndEquipment
|
598000000 | USD |
| CY2016 | us-gaap |
Payments To Acquire Property Plant And Equipment
PaymentsToAcquirePropertyPlantAndEquipment
|
584000000 | USD |
| CY2017 | us-gaap |
Payments To Acquire Property Plant And Equipment
PaymentsToAcquirePropertyPlantAndEquipment
|
514000000 | USD |
| CY2015 | us-gaap |
Payments To Invest In Decommissioning Fund
PaymentsToInvestInDecommissioningFund
|
19000000 | USD |
| CY2016 | us-gaap |
Payments To Invest In Decommissioning Fund
PaymentsToInvestInDecommissioningFund
|
25000000 | USD |
| CY2017 | us-gaap |
Payments To Invest In Decommissioning Fund
PaymentsToInvestInDecommissioningFund
|
18000000 | USD |
| CY2015 | us-gaap |
Pension And Other Postretirement Benefit Expense
PensionAndOtherPostretirementBenefitExpense
|
34000000 | USD |
| CY2016 | us-gaap |
Pension And Other Postretirement Benefit Expense
PensionAndOtherPostretirementBenefitExpense
|
28000000 | USD |
| CY2017 | us-gaap |
Pension And Other Postretirement Benefit Expense
PensionAndOtherPostretirementBenefitExpense
|
24000000 | USD |
| CY2016Q4 | us-gaap |
Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent
PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
|
281000000 | USD |
| CY2017Q4 | us-gaap |
Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent
PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
|
284000000 | USD |
| CY2015 | us-gaap |
Pension Contributions
PensionContributions
|
0 | USD |
| CY2016 | us-gaap |
Pension Contributions
PensionContributions
|
0 | USD |
| CY2017 | us-gaap |
Pension Contributions
PensionContributions
|
2000000 | USD |
| CY2017Q4 | us-gaap |
Pledged Financial Instruments Not Separately Reported Securities For Letter Of Credit Facilities
PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForLetterOfCreditFacilities
|
67000000 | USD |
| CY2016Q4 | us-gaap |
Preferred Stock No Par Value
PreferredStockNoParValue
|
0 | |
| CY2017Q4 | us-gaap |
Preferred Stock No Par Value
PreferredStockNoParValue
|
0 | |
| CY2016Q4 | us-gaap |
Preferred Stock Shares Authorized
PreferredStockSharesAuthorized
|
30000000 | shares |
| CY2017Q4 | us-gaap |
Preferred Stock Shares Authorized
PreferredStockSharesAuthorized
|
30000000 | shares |
| CY2016Q4 | us-gaap |
Preferred Stock Shares Issued
PreferredStockSharesIssued
|
0 | shares |
| CY2017Q4 | us-gaap |
Preferred Stock Shares Issued
PreferredStockSharesIssued
|
0 | shares |
| CY2016Q4 | us-gaap |
Preferred Stock Shares Outstanding
PreferredStockSharesOutstanding
|
0 | shares |
| CY2017Q4 | us-gaap |
Preferred Stock Shares Outstanding
PreferredStockSharesOutstanding
|
0 | shares |
| CY2016Q4 | us-gaap |
Preferred Stock Value
PreferredStockValue
|
0 | USD |
| CY2017Q4 | us-gaap |
Preferred Stock Value
PreferredStockValue
|
0 | USD |
| CY2016Q4 | us-gaap |
Prepaid Expense Current
PrepaidExpenseCurrent
|
48000000 | USD |
| CY2017Q4 | us-gaap |
Prepaid Expense Current
PrepaidExpenseCurrent
|
50000000 | USD |
| CY2016Q4 | us-gaap |
Price Risk Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value
PriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
|
23000000 | USD |
| CY2017Q4 | us-gaap |
Price Risk Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value
PriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
|
6000000 | USD |
| CY2017Q4 | us-gaap |
Public Utilities Property Plant And Equipment Accumulated Depreciation
PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
|
3564000000 | USD |
| CY2017Q3 | us-gaap |
Public Utilities Property Plant And Equipment Amount Of Construction Work In Process Included In Rate Base
PublicUtilitiesPropertyPlantAndEquipmentAmountOfConstructionWorkInProcessIncludedInRateBase
|
514000000 | USD |
| CY2016Q4 | us-gaap |
Public Utilities Property Plant And Equipment Construction Work In Progress
PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
|
213000000 | USD |
| CY2016Q4 | us-gaap |
Price Risk Derivative Instruments Not Designated As Hedging Instruments Liability At Fair Value
PriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue
|
169000000 | USD |
| CY2017Q4 | us-gaap |
Price Risk Derivative Instruments Not Designated As Hedging Instruments Liability At Fair Value
PriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue
|
210000000 | USD |
| CY2017 | us-gaap |
Proceeds From Decommissioning Fund
ProceedsFromDecommissioningFund
|
53000000 | USD |
| CY2013Q3 | us-gaap |
Proceeds From Issuance Of Common Stock
ProceedsFromIssuanceOfCommonStock
|
20000000 | USD |
| CY2015Q2 | us-gaap |
Proceeds From Issuance Of Common Stock
ProceedsFromIssuanceOfCommonStock
|
271000000 | USD |
| CY2015 | us-gaap |
Proceeds From Issuance Of Common Stock
ProceedsFromIssuanceOfCommonStock
|
271000000 | USD |
| CY2016 | us-gaap |
Proceeds From Issuance Of Common Stock
ProceedsFromIssuanceOfCommonStock
|
0 | USD |
| CY2017 | us-gaap |
Proceeds From Issuance Of Common Stock
ProceedsFromIssuanceOfCommonStock
|
0 | USD |
| CY2017 | us-gaap |
Proceeds From Issuance Of First Mortgage Bond
ProceedsFromIssuanceOfFirstMortgageBond
|
225000000 | USD |
| CY2016Q1 | us-gaap |
Proceeds From Issuance Of Long Term Debt
ProceedsFromIssuanceOfLongTermDebt
|
150000000 | USD |
| CY2017Q3 | us-gaap |
Proceeds From Issuance Of Long Term Debt
ProceedsFromIssuanceOfLongTermDebt
|
75000000 | USD |
| CY2015 | us-gaap |
Proceeds From Issuance Of Long Term Debt
ProceedsFromIssuanceOfLongTermDebt
|
145000000 | USD |
| CY2016 | us-gaap |
Proceeds From Issuance Of Long Term Debt
ProceedsFromIssuanceOfLongTermDebt
|
290000000 | USD |
| CY2017 | us-gaap |
Proceeds From Issuance Of Long Term Debt
ProceedsFromIssuanceOfLongTermDebt
|
225000000 | USD |
| CY2015 | us-gaap |
Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options
ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
|
1000000 | USD |
| CY2016 | us-gaap |
Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options
ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
|
1000000 | USD |
| CY2017 | us-gaap |
Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options
ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
|
2000000 | USD |
| CY2015 | us-gaap |
Proceeds From Payments For Other Financing Activities
ProceedsFromPaymentsForOtherFinancingActivities
|
-4000000 | USD |
| CY2016 | us-gaap |
Proceeds From Payments For Other Financing Activities
ProceedsFromPaymentsForOtherFinancingActivities
|
-7000000 | USD |
| CY2017 | us-gaap |
Proceeds From Payments For Other Financing Activities
ProceedsFromPaymentsForOtherFinancingActivities
|
-7000000 | USD |
| CY2015 | us-gaap |
Proceeds From Repayments Of Commercial Paper
ProceedsFromRepaymentsOfCommercialPaper
|
6000000 | USD |
| CY2016 | us-gaap |
Proceeds From Repayments Of Commercial Paper
ProceedsFromRepaymentsOfCommercialPaper
|
-6000000 | USD |
| CY2017 | us-gaap |
Proceeds From Repayments Of Commercial Paper
ProceedsFromRepaymentsOfCommercialPaper
|
0 | USD |
| CY2015 | us-gaap |
Proceeds From Sale Maturity And Collections Of Investments
ProceedsFromSaleMaturityAndCollectionsOfInvestments
|
22000000 | USD |
| CY2016 | us-gaap |
Proceeds From Sale Maturity And Collections Of Investments
ProceedsFromSaleMaturityAndCollectionsOfInvestments
|
27000000 | USD |
| CY2017 | us-gaap |
Proceeds From Sale Maturity And Collections Of Investments
ProceedsFromSaleMaturityAndCollectionsOfInvestments
|
21000000 | USD |
| CY2015 | us-gaap |
Profit Loss
ProfitLoss
|
172000000 | USD |
| CY2016 | us-gaap |
Profit Loss
ProfitLoss
|
193000000 | USD |
| CY2017 | us-gaap |
Profit Loss
ProfitLoss
|
187000000 | USD |
| CY2015 | us-gaap |
Provision For Doubtful Accounts
ProvisionForDoubtfulAccounts
|
6000000 | USD |
| CY2016 | us-gaap |
Provision For Doubtful Accounts
ProvisionForDoubtfulAccounts
|
5000000 | USD |
| CY2017 | us-gaap |
Provision For Doubtful Accounts
ProvisionForDoubtfulAccounts
|
6000000 | 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
|
12000000 | USD |
| CY2015 | us-gaap |
Public Utilities Allowance For Funds Used During Construction Capitalized Interest
PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest
|
13000000 | USD |
| CY2016 | us-gaap |
Public Utilities Allowance For Funds Used During Construction Capitalized Interest
PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest
|
11000000 | USD |
| CY2017 | us-gaap |
Public Utilities Allowance For Funds Used During Construction Capitalized Interest
PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest
|
6000000 | USD |
| CY2015 | us-gaap |
Public Utilities Allowance For Funds Used During Construction Rate
PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate
|
0.073 | |
| CY2016 | us-gaap |
Public Utilities Allowance For Funds Used During Construction Rate
PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate
|
0.073 | |
| CY2017 | us-gaap |
Public Utilities Allowance For Funds Used During Construction Rate
PublicUtilitiesAllowanceForFundsUsedDuringConstructionRate
|
0.073 | |
| CY2017 | us-gaap |
Public Utilities Approved Debt Capital Structure Percentage
PublicUtilitiesApprovedDebtCapitalStructurePercentage
|
0.0287 | |
| CY2015 | us-gaap |
Public Utilities Approved Return On Equity Percentage
PublicUtilitiesApprovedReturnOnEquityPercentage
|
0.0968 | |
| CY2016 | us-gaap |
Public Utilities Approved Return On Equity Percentage
PublicUtilitiesApprovedReturnOnEquityPercentage
|
0.096 | |
| CY2017 | us-gaap |
Public Utilities Approved Return On Equity Percentage
PublicUtilitiesApprovedReturnOnEquityPercentage
|
0.096 | |
| CY2016Q4 | us-gaap |
Public Utilities Property Plant And Equipment Accumulated Depreciation
PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation
|
3313000000 | USD |
| CY2017Q4 | us-gaap |
Public Utilities Property Plant And Equipment Construction Work In Progress
PublicUtilitiesPropertyPlantAndEquipmentConstructionWorkInProgress
|
391000000 | USD |
| CY2016Q4 | us-gaap |
Public Utilities Property Plant And Equipment Distribution
PublicUtilitiesPropertyPlantAndEquipmentDistribution
|
3343000000 | USD |
| CY2017Q4 | us-gaap |
Public Utilities Property Plant And Equipment Distribution
PublicUtilitiesPropertyPlantAndEquipmentDistribution
|
3543000000 | USD |
| CY2016Q4 | us-gaap |
Public Utilities Property Plant And Equipment Generation Or Processing
PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing
|
4597000000 | USD |
| CY2017Q4 | us-gaap |
Public Utilities Property Plant And Equipment Generation Or Processing
PublicUtilitiesPropertyPlantAndEquipmentGenerationOrProcessing
|
4667000000 | USD |
| CY2016Q4 | us-gaap |
Public Utilities Property Plant And Equipment Net
PublicUtilitiesPropertyPlantAndEquipmentNet
|
6434000000 | USD |
| CY2017Q4 | us-gaap |
Public Utilities Property Plant And Equipment Net
PublicUtilitiesPropertyPlantAndEquipmentNet
|
6741000000 | USD |
| CY2016Q4 | us-gaap |
Public Utilities Property Plant And Equipment Plant In Service
PublicUtilitiesPropertyPlantAndEquipmentPlantInService
|
9747000000 | USD |
| CY2017Q4 | us-gaap |
Public Utilities Property Plant And Equipment Plant In Service
PublicUtilitiesPropertyPlantAndEquipmentPlantInService
|
10305000000 | USD |
| CY2016Q4 | us-gaap |
Public Utilities Property Plant And Equipment Transmission
PublicUtilitiesPropertyPlantAndEquipmentTransmission
|
521000000 | USD |
| CY2017Q4 | us-gaap |
Public Utilities Property Plant And Equipment Transmission
PublicUtilitiesPropertyPlantAndEquipmentTransmission
|
547000000 | USD |
| CY2017Q4 | us-gaap |
Purchase Commitment Remaining Minimum Amount Committed
PurchaseCommitmentRemainingMinimumAmountCommitted
|
49000000 | USD |
| CY2017Q4 | us-gaap |
Ratio Of Indebtedness To Net Capital1
RatioOfIndebtednessToNetCapital1
|
0.518 | |
| CY2016Q4 | us-gaap |
Regulatory Assets Current
RegulatoryAssetsCurrent
|
36000000 | USD |
| CY2017Q4 | us-gaap |
Regulatory Assets Current
RegulatoryAssetsCurrent
|
62000000 | USD |
| CY2016Q4 | us-gaap |
Regulatory Assets Noncurrent
RegulatoryAssetsNoncurrent
|
498000000 | USD |
| CY2017Q4 | us-gaap |
Regulatory Assets Noncurrent
RegulatoryAssetsNoncurrent
|
438000000 | USD |
| CY2016Q4 | us-gaap |
Regulatory Liability Current
RegulatoryLiabilityCurrent
|
51000000 | USD |
| CY2017Q4 | us-gaap |
Regulatory Liability Current
RegulatoryLiabilityCurrent
|
31000000 | USD |
| CY2016Q4 | us-gaap |
Regulatory Liability Noncurrent
RegulatoryLiabilityNoncurrent
|
958000000 | USD |
| CY2017Q4 | us-gaap |
Regulatory Liability Noncurrent
RegulatoryLiabilityNoncurrent
|
1288000000 | USD |
| CY2017 | us-gaap |
Repayments Of Debt
RepaymentsOfDebt
|
150000000 | USD |
| CY2015 | us-gaap |
Repayments Of Long Term Debt
RepaymentsOfLongTermDebt
|
442000000 | USD |
| CY2016 | us-gaap |
Repayments Of Long Term Debt
RepaymentsOfLongTermDebt
|
133000000 | USD |
| CY2017 | us-gaap |
Repayments Of Long Term Debt
RepaymentsOfLongTermDebt
|
150000000 | USD |
| CY2016Q4 | us-gaap |
Retained Earnings Accumulated Deficit
RetainedEarningsAccumulatedDeficit
|
1150000000 | USD |
| CY2017Q4 | us-gaap |
Retained Earnings Accumulated Deficit
RetainedEarningsAccumulatedDeficit
|
1217000000 | USD |
| CY2016Q4 | us-gaap |
Secured Debt
SecuredDebt
|
2090000000 | USD |
| CY2017Q4 | us-gaap |
Secured Debt
SecuredDebt
|
2315000000 | USD |
| CY2015 | us-gaap |
Share Based Compensation
ShareBasedCompensation
|
6000000 | USD |
| CY2016 | us-gaap |
Share Based Compensation
ShareBasedCompensation
|
6000000 | USD |
| CY2017 | us-gaap |
Share Based Compensation
ShareBasedCompensation
|
7000000 | USD |
| CY2015 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
|
14988 | shares |
| CY2016 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
|
3044 | shares |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
|
64840 | shares |
| CY2015 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
|
34.10 | |
| CY2016 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
|
28.62 | |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
|
39.57 | |
| CY2015 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
|
181797 | shares |
| CY2016 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
|
193734 | shares |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
|
202145 | shares |
| CY2015 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
|
34.77 | |
| CY2016 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
|
35.89 | |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
|
41.96 | |
| CY2014Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
|
463893 | shares |
| CY2015Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
|
442993 | shares |
| CY2016Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
|
458792 | shares |
| CY2017Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
|
399376 | shares |
| CY2014Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
|
28.96 | |
| CY2015Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
|
32.84 | |
| CY2016Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
|
34.68 | |
| CY2017Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
|
37.98 | |
| CY2015 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Share Based Liabilities Paid
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid
|
0 | USD |
| CY2016 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Share Based Liabilities Paid
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid
|
0 | USD |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Share Based Liabilities Paid
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid
|
1000000 | USD |
| CY2015 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
|
187709 | shares |
| CY2016 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
|
174891 | shares |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
|
196721 | shares |
| CY2015 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
|
4000000 | USD |
| CY2016 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
|
5000000 | USD |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
|
6000000 | USD |
| CY2015 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
|
25.82 | |
| CY2016 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
|
31.47 | |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
|
31.78 | |
| CY2016 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate
ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
|
0 | |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate
ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
|
0 | |
| CY2016 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum
ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
|
0.259 | |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum
ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum
|
0.229 | |
| CY2016 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum
ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
|
0.145 | |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum
ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum
|
0.156 | |
| CY2016 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate
ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
|
0.009 | |
| CY2017 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate
ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
|
0.015 | |
| CY2017Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized
ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
|
4687500 | shares |
| CY2017Q4 | us-gaap |
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant
ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
|
3229476 | shares |
| CY2015Q4 | us-gaap |
Short Term Debt Weighted Average Interest Rate
ShortTermDebtWeightedAverageInterestRate
|
0.006 | |
| CY2016Q4 | us-gaap |
Short Term Debt Weighted Average Interest Rate
ShortTermDebtWeightedAverageInterestRate
|
0.007 | |
| CY2017Q4 | us-gaap |
Short Term Debt Weighted Average Interest Rate
ShortTermDebtWeightedAverageInterestRate
|
0.000 | |
| CY2015 | us-gaap |
Shortterm Debt Average Outstanding Amount
ShorttermDebtAverageOutstandingAmount
|
0 | USD |
| CY2016 | us-gaap |
Shortterm Debt Average Outstanding Amount
ShorttermDebtAverageOutstandingAmount
|
1000000 | USD |
| CY2017 | us-gaap |
Shortterm Debt Average Outstanding Amount
ShorttermDebtAverageOutstandingAmount
|
0 | USD |
| CY1997 | us-gaap |
Site Contingency Names Of Other Potentially Responsible Parties
SiteContingencyNamesOfOtherPotentiallyResponsibleParties
|
69 | |
| CY2017 | us-gaap |
Site Contingency Names Of Other Potentially Responsible Parties
SiteContingencyNamesOfOtherPotentiallyResponsibleParties
|
100 | |
| CY2015 | us-gaap |
Stock Granted During Period Value Sharebased Compensation
StockGrantedDuringPeriodValueSharebasedCompensation
|
6000000 | USD |
| CY2016 | us-gaap |
Stock Granted During Period Value Sharebased Compensation
StockGrantedDuringPeriodValueSharebasedCompensation
|
4000000 | USD |
| CY2017 | us-gaap |
Stock Granted During Period Value Sharebased Compensation
StockGrantedDuringPeriodValueSharebasedCompensation
|
4000000 | USD |
| CY2015 | us-gaap |
Stock Issued During Period Value New Issues
StockIssuedDuringPeriodValueNewIssues
|
271000000 | USD |
| CY2014Q4 | us-gaap |
Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
|
1911000000 | USD |
| CY2015Q4 | us-gaap |
Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
|
2258000000 | USD |
| CY2016Q4 | us-gaap |
Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
|
2344000000 | USD |
| CY2017Q4 | us-gaap |
Stockholders Equity Including Portion Attributable To Noncontrolling Interest
StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
|
2416000000 | USD |
| CY2015 | us-gaap |
Taxes Excluding Income And Excise Taxes
TaxesExcludingIncomeAndExciseTaxes
|
116000000 | USD |
| CY2016 | us-gaap |
Taxes Excluding Income And Excise Taxes
TaxesExcludingIncomeAndExciseTaxes
|
119000000 | USD |
| CY2017 | us-gaap |
Taxes Excluding Income And Excise Taxes
TaxesExcludingIncomeAndExciseTaxes
|
123000000 | USD |
| CY2016Q4 | us-gaap |
Taxes Payable Current
TaxesPayableCurrent
|
25000000 | USD |
| CY2017Q4 | us-gaap |
Taxes Payable Current
TaxesPayableCurrent
|
31000000 | USD |
| CY2016Q4 | us-gaap |
Us Government Securities At Carrying Value
USGovernmentSecuritiesAtCarryingValue
|
12000000 | USD |
| CY2017Q4 | us-gaap |
Us Government Securities At Carrying Value
USGovernmentSecuritiesAtCarryingValue
|
11000000 | USD |
| CY2016Q4 | us-gaap |
Unamortized Debt Issuance Expense
UnamortizedDebtIssuanceExpense
|
11000000 | USD |
| CY2017Q4 | us-gaap |
Unamortized Debt Issuance Expense
UnamortizedDebtIssuanceExpense
|
10000000 | USD |
| CY2015 | us-gaap |
Unrealized Gain Loss On Securities
UnrealizedGainLossOnSecurities
|
-6000000 | USD |
| CY2016 | us-gaap |
Unrealized Gain Loss On Securities
UnrealizedGainLossOnSecurities
|
-5000000 | USD |
| CY2017 | us-gaap |
Unrealized Gain Loss On Securities
UnrealizedGainLossOnSecurities
|
-2000000 | USD |
| CY2016Q4 | us-gaap |
Unrecognized Tax Benefits
UnrecognizedTaxBenefits
|
0 | USD |
| CY2017Q4 | us-gaap |
Unrecognized Tax Benefits
UnrecognizedTaxBenefits
|
0 | USD |
| CY2016Q4 | us-gaap |
Unsecured Debt Current
UnsecuredDebtCurrent
|
150000000 | USD |
| CY2017Q4 | us-gaap |
Unsecured Debt Current
UnsecuredDebtCurrent
|
0 | USD |
| CY2015 | us-gaap |
Weighted Average Number Diluted Shares Outstanding Adjustment
WeightedAverageNumberDilutedSharesOutstandingAdjustment
|
161000 | shares |
| CY2016 | us-gaap |
Weighted Average Number Diluted Shares Outstanding Adjustment
WeightedAverageNumberDilutedSharesOutstandingAdjustment
|
158000 | shares |
| CY2017 | us-gaap |
Weighted Average Number Diluted Shares Outstanding Adjustment
WeightedAverageNumberDilutedSharesOutstandingAdjustment
|
120000 | shares |
| CY2015 | us-gaap |
Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
|
84341000 | shares |
| CY2016 | us-gaap |
Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
|
89054000 | shares |
| CY2017 | us-gaap |
Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
|
89176000 | shares |
| CY2015 | us-gaap |
Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
|
84180000 | shares |
| CY2016 | us-gaap |
Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
|
88896000 | shares |
| CY2017 | us-gaap |
Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
|
89056000 | shares |
