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v3.19.3

Accounting for Derivative Instruments and Hedging Activities - Offsetting of derivatives by counterparty master agreement level and collateral received (Details) - USD ($) $ in Millions | Sep. 30, 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 | $ (30) | $ (33)
Derivative liabilities | (1,032) | (977)
Cash Collateral Posted | 164 | 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 | 1,093 | 1,042
Derivative Instruments | (869) | (778)
Cash Collateral (Held) / Posted | (5) | (31)
Net Amount | 219 | 233
Derivative liabilities | (1,032) | (977)
Derivative Instruments | 869 | 778
Cash Collateral Posted | 70 | 114
Net Amount | (93) | (85)
Gross Amounts of Recognized Assets / Liabilities | 61 | 65
Derivative Instruments | 0 | 0
Cash Collateral (Held) / Posted | 65 | 83
Net Amount | $ 126 | 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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