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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, 2019 | Dec. 31, 2018
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Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid |  |
Cash Collateral (Held)/Posted | $ (32) | $ (33)
Cash Collateral (Held)/Posted | 190 | 287
Gross Amounts of Recognized Assets / Liabilities |  | 104
Derivative Instruments |  | 0
Cash Collateral (Held) / Posted |  | 83
Net Amount |  | 187
Commodity contracts |  |
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid |  |
Derivative assets | 1,170 | 1,042
Derivative Instruments | (909) | (778)
Cash Collateral (Held)/Posted | (7) | (31)
Net Amount | 254 | 233
Derivative liabilities | (1,103) | (977)
Derivative Instruments | 909 | 778
Cash Collateral (Held)/Posted | 73 | 114
Net Amount | (121) | (85)
Gross Amounts of Recognized Assets / Liabilities | 67 | 65
Derivative Instruments | 0 | 0
Cash Collateral (Held) / Posted | 66 | 83
Net Amount | $ 133 | 148
Interest rate contracts |  |
Offsetting of Derivatives by Counterparty Master Agreement Level and Collateral Received or Paid |  |
Derivative assets |  | 39
Derivative Instruments |  | 0
Cash Collateral (Held)/Posted |  | 0
Net Amount |  | 39
Gross Amounts of Recognized Assets / Liabilities |  | 39
Derivative Instruments |  | 0
Cash Collateral (Held) / Posted |  | 0
Net Amount |  | $ 39

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