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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative assets and liabilities |  |
Initial margin | $ 91 | $ 73
Variation margin posted/(returned) | 290 | (45)
Letters of credit | (129) | (157)
Net broker receivable | 318 |
Net broker payable |  | (45)
Exchange Traded |  |
Derivative assets and liabilities |  |
Letters of credit | $ (63) | $ (73)

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- Definition Cash posted by (returned to) the reporting entity to (from) a broker or counterparty to comply with initial margin requirements. + References No definition available. + Details
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