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Fair Value of Derivative Contracts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Energy commodity derivative contracts(a) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 87 | $ 174
Derivative Asset, Contracts Available for Netting | (42) | (43)
Derivative Liability, Fair Value, Gross Liability | (101) | (111)
Derivative Liability, Not Offset, Policy Election Deduction | 42 | 43
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | 0 | (15)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Liability Net, Gain (Loss) Included in Earnings | 0 | (9)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Liability Net, Settlements | 0 | 24
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | 0 | 0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | 0 | 0
Interest rate swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 205 | 300
Derivative Asset, Contracts Available for Netting | (15) | (18)
Derivative Liability, Fair Value, Gross Liability | (65) | (57)
Derivative Liability, Not Offset, Policy Election Deduction | 15 | 18
Currency Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 166 |
Derivative Asset, Contracts Available for Netting | (6) |
Derivative Liability, Fair Value, Gross Liability | (6) | (31)
Derivative Liability, Not Offset, Policy Election Deduction | 6 | 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Energy commodity derivative contracts(a) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 17 | 6
Derivative Liability, Fair Value, Gross Liability | (3) | (29)
Quoted prices in active markets for identical assets (Level 1) [Member] | Interest rate swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Currency Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 0 |
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Energy commodity derivative contracts(a) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 70 | 168
Derivative Liability, Fair Value, Gross Liability | (98) | (82)
Fair Value, Inputs, Level 2 [Member] | Interest rate swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 205 | 300
Derivative Liability, Fair Value, Gross Liability | (65) | (57)
Fair Value, Inputs, Level 2 [Member] | Currency Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 166 |
Derivative Liability, Fair Value, Gross Liability | (6) | (31)
Significant unobservable inputs (Level 3) [Member] | Energy commodity derivative contracts(a) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Significant unobservable inputs (Level 3) [Member] | Interest rate swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Significant unobservable inputs (Level 3) [Member] | Currency Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 0 |
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Energy commodity derivative contracts(a) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 33 | 131
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (59) | (31)
Interest rate swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 190 | 282
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (50) | (39)
Currency Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 160 |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 | (31)
Contract and Over the Counter [Member] | Energy commodity derivative contracts(a) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative, Collateral, Obligation to Return Cash, Variation Margin | (12) | 0
Derivative, Collateral, Right to Reclaim Cash, Variation Margins | 0 | 37
Contract and Over the Counter [Member] | Interest rate swap agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative, Collateral, Obligation to Return Cash, Variation Margin | 0 | 0
Derivative, Collateral, Right to Reclaim Cash, Variation Margins | 0 | 0
Contract and Over the Counter [Member] | Currency Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative, Collateral, Obligation to Return Cash, Variation Margin | 0 |
Derivative, Collateral, Right to Reclaim Cash, Variation Margins | $ 0 | $ 0

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- Definition Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset, deducted from derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(1)(i) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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