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Derivatives and Risk Management Activities - Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative assets and liabilities |  |
Initial margin | $ 133 | $ 91
Variation margin posted/(returned) | 173 | 290
Letters of credit | (98) | (129)
Net broker receivable/(payable) | 259 | 318
Exchange Traded |  |
Derivative assets and liabilities |  |
Letters of credit | $ (47) | $ (63)

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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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- Definition Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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