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Commitments, Contingencies, And Guarantees (Net Realized Gains (Losses) Of Derivative Instrument Activity In Consolidated Statement Of Operations) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) on Derivative | $ 27 | $ (284)
Foreign currency forward contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) on Derivative | 14 | (10)
All Other Futures Contracts And Options [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) on Derivative | (8) | (34)
Convertibles and Bonds with Warrants Attached [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) on Derivative | 0 | 5
Investment And Embedded Derivative Instruments [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) on Derivative | 6 | (39)
Guaranteed Minimum Income Benefit [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) on Derivative | 93 | (228)
Single-Stock Future [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) on Derivative | (74) | (15)
Other Derivatives [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) on Derivative | 2 | (2)
Guaranteed Living Benefit And Other Derivative Instruments [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) on Derivative | $ 21 | $ (245)

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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=64837297&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=64837297&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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