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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 | Sep. 30, 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 | $ (15) | $ (32)
Derivative liabilities | (813) | (1,103)
Cash Collateral Posted | 77 | 190
Commodity contracts |  |
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid |  |
Derivative assets | 893 | 1,170
Derivative Instruments | (738) | (909)
Cash Collateral (Held) / Posted | (1) | (7)
Net Amount | 154 | 254
Derivative liabilities | (813) | (1,103)
Derivative Instruments | 738 | 909
Cash Collateral Posted | 0 | 73
Net Amount | (75) | (121)
Gross Amounts of Recognized Assets / Liabilities | 80 | 67
Derivative Instruments | 0 | 0
Cash Collateral (Held) / Posted | (1) | 66
Net Amount | $ 79 | $ 133

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