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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 23,361 $ 22,810
Other comprehensive income $ 77 $ 29 285 562
Ending Balance 24,361 23,406 24,361 23,406
OTTI Gains (Losses) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 23 28 27 24
Other comprehensive income (loss) before reclassifications, after tax 1 7   9
Reclassification of (gains) losses from accumulated other comprehensive income, after tax   (4) (3) (2)
Other comprehensive income 1 3 (3) 7
Amounts attributable to noncontrolling interests   (1)   (1)
Ending Balance 24 30 24 30
Unrealized Gains (Losses) on Investments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 705 838 576 347
Other comprehensive income (loss) before reclassifications, after tax 35 69 228 608
Reclassification of (gains) losses from accumulated other comprehensive income, after tax (12) (27) (61) (17)
Other comprehensive income 23 42 167 591
Amounts attributable to noncontrolling interests (3) (4) (18) (62)
Ending Balance 725 876 725 876
Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (2) (2) (2) (3)
Other comprehensive income (loss) before reclassifications, after tax (2)   (3)  
Reclassification of (gains) losses from accumulated other comprehensive income, after tax 3 1 4 2
Other comprehensive income 1 1 1 2
Amounts attributable to noncontrolling interests (1) (1) (1) (1)
Ending Balance (2) (2) (2) (2)
Pension Liability [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (632) (639) (646) (649)
Reclassification of (gains) losses from accumulated other comprehensive income, after tax 11 7 26 20
Other comprehensive income 11 7 26 20
Amounts attributable to noncontrolling interests (1)   (2) (3)
Ending Balance (622) (632) (622) (632)
Foreign Currency Translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (130) (106) (178) (76)
Other comprehensive income (loss) before reclassifications, after tax 41 (24) 94 (58)
Other comprehensive income 41 (24) 94 (58)
Amounts attributable to noncontrolling interests (4) 2 (9) 6
Ending Balance (93) (128) (93) (128)
Accumulated Other Comprehensive Income (Loss) [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (36) 119 (223) (357)
Other comprehensive income (loss) before reclassifications, after tax 75 52 319 559
Reclassification of (gains) losses from accumulated other comprehensive income, after tax 2 (23) (34) 3
Other comprehensive income 77 29 285 562
Amounts attributable to noncontrolling interests (9) (4) (30) (61)
Ending Balance $ 32 $ 144 $ 32 $ 144