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Derivative Instruments - Derivatives - Non-qualifying Strategies (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | $ (5) | $ 9 | $ 3 | $ 8
Total other non-qualifying derivatives |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | (7) | 8 | 1 | 6
Foreign Exchange Forward [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | 2 | 1 | 2 | 2
Interest rate swaps, swaptions, and futures |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | (5) | 1 | (20) | 7
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) | 0 | (1) | 0
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 | 0 | 8 | 27 | 0
Equity options |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | $ (1) | $ (1) | $ (5) | $ (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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- 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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