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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)