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Derivatives - Fair Value Hedges - Non-qualifying Strategies (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | $ 104 | $ (24) | $ (12)
Interest rate swaps, swaptions and futures |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | 21 | (35) | (3)
Credit derivatives | Credit derivatives that purchase credit protection |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | 2 | (5) | 0
Credit derivatives | Credit derivatives that assume credit risk |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | 2 | 32 | (14)
Equity index swaps and options |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | 76 | (17) | 2
Foreign Exchange Forward [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | $ 3 | $ 1 | $ 3

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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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