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Risk Management - Fair Value of Derivative Contracts (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | $ 460 | $ 551
Liability derivatives | (65) | (171)
Energy commodity derivative contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 56 | 221
Liability derivatives | (58) | (50)
Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 358 | 133
Liability derivatives | (1) | (115)
Foreign currency contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 46 | 197
Liability derivatives | (6) | (6)
Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 452 | 529
Liability derivatives | (58) | (166)
Designated as Hedging Instrument | Energy commodity derivative contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 48 | 199
Liability derivatives | (51) | (45)
Designated as Hedging Instrument | Energy commodity derivative contracts | Fair Value of Derivatives Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 31 | 135
Designated as Hedging Instrument | Energy commodity derivative contracts | Other Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (43) | (45)
Designated as Hedging Instrument | Energy commodity derivative contracts | Deferred Charges and Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 17 | 64
Designated as Hedging Instrument | Energy commodity derivative contracts | Other Long-Term Liabilities and Deferred Credits |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (8) | 0
Designated as Hedging Instrument | Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 358 | 133
Liability derivatives | (1) | (115)
Designated as Hedging Instrument | Interest rate contracts | Fair Value of Derivatives Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 45 | 12
Designated as Hedging Instrument | Interest rate contracts | Other Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | 0 | (37)
Designated as Hedging Instrument | Interest rate contracts | Deferred Charges and Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 313 | 121
Designated as Hedging Instrument | Interest rate contracts | Other Long-Term Liabilities and Deferred Credits |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (1) | (78)
Designated as Hedging Instrument | Foreign currency contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 46 | 197
Liability derivatives | (6) | (6)
Designated as Hedging Instrument | Foreign currency contracts | Fair Value of Derivatives Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 0 | 91
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 | 46 | 106
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 |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 8 | 22
Liability derivatives | (7) | (5)
Not Designated as Hedging Instrument | Energy commodity derivative contracts | Fair Value of Derivatives Contracts |  |
Derivatives, Fair Value [Line Items] |  |
Asset derivatives | 8 | 22
Not Designated as Hedging Instrument | Energy commodity derivative contracts | Other Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | $ (7) | $ (5)

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