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Derivative Instruments - Derivatives - Fair Value Hedges - Non-qualifying Strategies (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | $ 15 | $ (13)
Total other non-qualifying derivatives |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | 14 | (10)
Foreign currency swaps and forwards |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | 1 | (3)
Interest rate swaps, swaptions, and futures |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | (8) | (2)
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 | 1 | (1)
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 | 21 | (8)
Equity Options |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | $ 0 | $ 1

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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=109980867&loc=SL5618551-113959 + Details
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