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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain Loss on Derivative | $ (22) | $ 48 | $ 68 | $ (442)
Foreign currency forward contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain Loss on Derivative | (7) | (10) | 0 | (30)
All Other Futures Contracts And Options [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain Loss on Derivative | (8) | 8 | (25) | (63)
Convertibles and Bonds with Warrants Attached [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain Loss on Derivative | 1 | 3 | 1 | 8
Investment And Embedded Derivative Instruments [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain Loss on Derivative | (14) | 1 | (24) | (85)
Guaranteed Minimum Income Benefit [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain Loss on Derivative | 54 | 89 | 265 | (270)
Single-Stock Future [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain Loss on Derivative | (57) | (45) | (169) | (88)
Other Derivatives [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain Loss on Derivative | (5) | 3 | (4) | 1
Guaranteed Living Benefit And Other Derivative Instruments [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain Loss on Derivative | $ (8) | $ 47 | $ 92 | $ (357)

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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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