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Fair Value of Derivative Contracts (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ 551 | $ 458
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (171) | (172)
Energy Related Derivative |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 221 | 87
Derivative Asset, Contracts Available for Netting | (39) | (42)
Derivative, Collateral, Obligation to Return Cash, Variation Margin | (25) | (12)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 157 | 33
Derivative Liability, Fair Value, Gross Liability | (50) | (101)
Derivative Liability, Not Offset, Policy Election Deduction | 39 | 42
Derivative, Collateral, Right to Reclaim Cash, Variation Margins | 0 | 0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (11) | (59)
Interest rate contract |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 133 | 205
Derivative Asset, Contracts Available for Netting | (7) | (15)
Derivative, Collateral, Obligation to Return Cash, Variation Margin | 0 | 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 126 | 190
Derivative Liability, Fair Value, Gross Liability | (115) | (65)
Derivative Liability, Not Offset, Policy Election Deduction | 7 | 15
Derivative, Collateral, Right to Reclaim Cash, Variation Margins | 0 | 0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | (108) | (50)
Currency Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 197 | 166
Derivative Asset, Contracts Available for Netting | (6) | (6)
Derivative, Collateral, Obligation to Return Cash, Variation Margin | 0 | 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 191 | 160
Derivative Liability, Fair Value, Gross Liability | (6) | (6)
Derivative Liability, Not Offset, Policy Election Deduction | 6 | 6
Derivative, Collateral, Right to Reclaim Cash, Variation Margins | 0 | 0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 | 0
Quoted prices in active markets for identical assets (Level 1) [Member] | Energy Related Derivative |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 28 | 17
Derivative Liability, Fair Value, Gross Liability | (11) | (3)
Quoted prices in active markets for identical assets (Level 1) [Member] | Interest rate contract |  |
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 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Energy Related Derivative |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 193 | 70
Derivative Liability, Fair Value, Gross Liability | (39) | (98)
Fair Value, Inputs, Level 2 [Member] | Interest rate contract |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 133 | 205
Derivative Liability, Fair Value, Gross Liability | (115) | (65)
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 | 197 | 166
Derivative Liability, Fair Value, Gross Liability | (6) | (6)
Significant unobservable inputs (Level 3) [Member] | Energy Related Derivative |  |
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 contract |  |
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 | 0
Derivative Liability, Fair Value, Gross Liability | $ 0 | $ 0

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