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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | $ (6) | $ 74 | $ (7)
Foreign currency swaps and forwards |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | (14) | 83 | 13
Interest rate swaps, swaptions and futures |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | (5) | 1 | (8)
Credit derivatives | Credit derivatives that purchase credit protection |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | 28 | (17) | 5
Credit derivatives | Credit derivatives that assume credit risk |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | (7) | 28 | (7)
Equity index options |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | (7) | (15) | 0
Commodity options |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | 0 | 0 | (4)
Contingent capital facility put option |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | (1) | (6) | (6)
Total other non-qualifying derivatives |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Non-qualifying foreign currency derivatives | $ 8 | $ (9) | $ (20)

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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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