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Level 4~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, 2018 | Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | $ (13) | $ 0
Credit derivatives that purchase credit protection |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | (1) | (5)
Credit Default Swap, Selling Protection [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | (8) | 9
Other Credit Derivatives [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | (10) | 7
Foreign Exchange Forward [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | (3) | (7)
Interest rate derivatives |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | (2) | 5
Equity derivatives |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | 1 | (1)
Contingent capital facility put option |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | 0 | (1)
Foreign currency swaps | Foreign Exchange Forward [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Non-qualifying foreign currency derivatives | $ (3) | $ (7)

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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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