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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ 22,810 | $ 24,650
Other comprehensive income (loss) before reclassifications, after tax | $ 52 | $ (122) | 559 | (390)
Reclassification of (gains) losses from accumulated other comprehensive income, after tax | (23) | 37 | 3 | 51
Other comprehensive income (loss) | 29 | (85) | 562 | (339)
Issuance of equity securities by subsidiary |  |  |  | 1
Amounts attributable to noncontrolling interests | (4) | 9 | (61) | 35
Ending Balance | 23,406 | 24,153 | 23,406 | 24,153
OTTI Gains (Losses) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 28 | 28 | 24 | 32
Other comprehensive income (loss) before reclassifications, after tax | 7 | 2 | 9 | (3)
Reclassification of (gains) losses from accumulated other comprehensive income, after tax | (4) |  | (2) |
Other comprehensive income (loss) | 3 | 2 | 7 | (3)
Amounts attributable to noncontrolling interests | (1) |  | (1) | 1
Ending Balance | 30 | 30 | 30 | 30
Unrealized Gains (Losses) on Investments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 838 | 619 | 347 | 846
Other comprehensive income (loss) before reclassifications, after tax | 69 | (70) | 608 | (321)
Reclassification of (gains) losses from accumulated other comprehensive income, after tax | (27) | 31 | (17) | 29
Other comprehensive income (loss) | 42 | (39) | 591 | (292)
Amounts attributable to noncontrolling interests | (4) | 4 | (62) | 30
Ending Balance | 876 | 584 | 876 | 584
Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (2) | (3) | (3) | (6)
Other comprehensive income (loss) before reclassifications, after tax |  |  |  | (2)
Reclassification of (gains) losses from accumulated other comprehensive income, after tax | 1 | 1 | 2 | 7
Other comprehensive income (loss) | 1 | 1 | 2 | 5
Amounts attributable to noncontrolling interests | (1) | (1) | (1) | (2)
Ending Balance | (2) | (3) | (2) | (3)
Pension Liability [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (639) | (598) | (649) | (641)
Other comprehensive income (loss) before reclassifications, after tax |  | (1) |  | 36
Reclassification of (gains) losses from accumulated other comprehensive income, after tax | 7 | 5 | 20 | 15
Other comprehensive income (loss) | 7 | 4 | 20 | 51
Issuance of equity securities by subsidiary |  |  |  | 1
Amounts attributable to noncontrolling interests |  | 1 | (3) | (4)
Ending Balance | (632) | (593) | (632) | (593)
Foreign Currency Translation [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (106) | 7 | (76) | 49
Other comprehensive income (loss) before reclassifications, after tax | (24) | (53) | (58) | (100)
Other comprehensive income (loss) | (24) | (53) | (58) | (100)
Amounts attributable to noncontrolling interests | 2 | 5 | 6 | 10
Ending Balance | (128) | (41) | (128) | (41)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | 119 | 53 | (357) | 280
Other comprehensive income (loss) |  |  | 501 | (304)
Ending Balance | $ 144 | $ (23) | $ 144 | $ (23)

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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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