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Risk Management - FV Input Level - Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Gross amount | $ (65) | $ (171)
Energy commodity derivative contracts |  |
Derivative [Line Items] |  |
Gross amount | (58) | (50)
Contracts available for netting | 19 | 39
Collateral posted(b) | 0 | 0
Net amount | (39) | (11)
Interest rate contracts |  |
Derivative [Line Items] |  |
Gross amount | (1) | (115)
Contracts available for netting | 0 | 7
Collateral posted(b) | 0 | 0
Net amount | (1) | (108)
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 | (3) | (11)
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 | (55) | (39)
Level 2 | Interest rate contracts |  |
Derivative [Line Items] |  |
Gross amount | (1) | (115)
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 |

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