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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 | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | $ 12 | $ (6) | $ (1) | $ (6)
Total other non-qualifying derivatives |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | 8 | 1 | (2) | 8
Foreign currency swaps and forwards |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | 4 | (7) | 1 | (14)
Total foreign exchange contracts |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | 4 | (7) | 1 | (14)
Interest rate swaps, swaptions, and futures |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | 8 | (7) | 6 | (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 | 23 | 0 | 18
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 | (16) | (8) | (7)
Equity Options |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | (1) | 1 | 0 | 0
Contingent capital facility put option |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Non-qualifying foreign currency derivatives | $ 0 | $ 0 | $ 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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + 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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