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Derivative Instruments - Derivatives - Non-qualifying Strategies (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | $ 35 | $ 92
Foreign Exchange Forward [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | 0 | 3
Interest rate swaps, swaptions, and futures |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | 32 | 20
Credit derivatives that assume credit risk | Credit derivatives that purchase credit protection |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | 0 | 6
Credit derivatives that assume credit risk | Credit derivatives that assume credit risk |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | 3 | (12)
Equity options |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | $ 0 | $ 75

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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