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Risk Management - Fair Value of Derivative Contracts (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | $ 931 | $ 460
Liability derivatives | (78) | (65)
Energy commodity derivative contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 99 | 56
Liability derivatives | (63) | (58)
Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 694 | 358
Liability derivatives | (10) | (1)
Foreign currency contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 138 | 46
Liability derivatives | (6) | (6)
Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 907 | 452
Liability derivatives | (57) | (58)
Designated as Hedging Instrument | Energy commodity derivative contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 75 | 48
Liability derivatives | (41) | (51)
Designated as Hedging Instrument | Energy commodity derivative contracts | Fair Value of Derivatives Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 42 | 31
Designated as Hedging Instrument | Energy commodity derivative contracts | Other Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (33) | (43)
Designated as Hedging Instrument | Energy commodity derivative contracts | Deferred Charges and Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 33 | 17
Designated as Hedging Instrument | Energy commodity derivative contracts | Other Long-Term Liabilities and Deferred Credits |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (8) | (8)
Designated as Hedging Instrument | Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 694 | 358
Liability derivatives | (10) | (1)
Designated as Hedging Instrument | Interest rate contracts | Fair Value of Derivatives Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 119 | 45
Designated as Hedging Instrument | Interest rate contracts | Other Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (3) | 0
Designated as Hedging Instrument | Interest rate contracts | Deferred Charges and Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 575 | 313
Designated as Hedging Instrument | Interest rate contracts | Other Long-Term Liabilities and Deferred Credits |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (7) | (1)
Designated as Hedging Instrument | Foreign currency contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 138 | 46
Liability derivatives | (6) | (6)
Designated as Hedging Instrument | Foreign currency contracts | Fair Value of Derivatives Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 0 | 0
Designated as Hedging Instrument | Foreign currency contracts | Other Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (6) | (6)
Designated as Hedging Instrument | Foreign currency contracts | Deferred Charges and Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 138 | 46
Designated as Hedging Instrument | Foreign currency contracts | Other Long-Term Liabilities and Deferred Credits |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | 0 | 0
Not Designated as Hedging Instrument | Energy commodity derivative contracts | Fair Value of Derivatives Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 24 | 8
Not Designated as Hedging Instrument | Energy commodity derivative contracts | Other Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | $ (21) | $ (7)

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