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Derivatives and Risk Management Activities - Broker Receivable/Payable (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Offsetting Assets, Liabilities [Line Items] |  |
Initial margin | $ 140 | $ 73
Variation margin posted/(returned) | (20) | (45)
Letters of credit | (112) | (157)
Net broker receivable | 45 |
Net broker payable |  | (45)
Exchange traded |  |
Offsetting Assets, Liabilities [Line Items] |  |
Letters of credit | $ (75) | $ (73)

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- Definition The amount of cash or securities required by a broker or counterparty as security for a trading or derivatives securities position. + References No definition available. + Details
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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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