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Risk Management - FV Input Level - Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Gross amount | $ (78) | $ (65)
Energy commodity derivative contracts |  |
Derivative [Line Items] |  |
Gross amount | (63) | (58)
Contracts available for netting | 35 | 19
Collateral posted(b) | (8) | 0
Net amount | (36) | (39)
Interest rate contracts |  |
Derivative [Line Items] |  |
Gross amount | (10) | (1)
Contracts available for netting | 2 | 0
Collateral posted(b) | 0 | 0
Net amount | (8) | (1)
Foreign currency contracts |  |
Derivative [Line Items] |  |
Gross amount | (6) | (6)
Contracts available for netting | 6 | 6
Collateral posted(b) | 0 | 0
Net amount | 0 | 0
Level 1 | Energy commodity derivative contracts |  |
Derivative [Line Items] |  |
Gross amount | (7) | (3)
Level 1 | Interest rate contracts |  |
Derivative [Line Items] |  |
Gross amount | 0 | 0
Level 1 | Foreign currency contracts |  |
Derivative [Line Items] |  |
Gross amount | 0 | 0
Level 2 | Energy commodity derivative contracts |  |
Derivative [Line Items] |  |
Gross amount | (56) | (55)
Level 2 | Interest rate contracts |  |
Derivative [Line Items] |  |
Gross amount | (10) | (1)
Level 2 | Foreign currency contracts |  |
Derivative [Line Items] |  |
Gross amount | (6) | (6)
Level 3 | Energy commodity derivative contracts |  |
Derivative [Line Items] |  |
Gross amount | 0 | 0
Level 3 | Interest rate contracts |  |
Derivative [Line Items] |  |
Gross amount | 0 | 0
Level 3 | Foreign currency contracts |  |
Derivative [Line Items] |  |
Gross amount | $ 0 | $ 0

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