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Accounting for Derivative Instruments and Hedging Activities - Offsetting of Derivatives by Counterparty Master Agreement level and Collateral Received (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid |  |
Cash Collateral (Held)/Posted | $ (19) | $ (32)
Cash Collateral (Held)/Posted | 50 | 190
Commodity contracts |  |
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid |  |
Derivative assets | 821 | 1,170
Derivative Instruments | (658) | (909)
Cash Collateral (Held)/Posted | (5) | (7)
Net Amount | 158 | 254
Derivative liabilities | (884) | (1,103)
Derivative Instruments | 658 | 909
Cash Collateral (Held)/Posted | 0 | 73
Net Amount | (226) | (121)
Gross Amounts of Recognized Assets / Liabilities | (63) | 67
Derivative Instruments | 0 | 0
Cash Collateral (Held) / Posted | (5) | 66
Net Amount | $ (68) | $ 133

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