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Shareholders' Equity - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 21,386 $ 24,566
Cumulative effect adjustments from changes in accounting standards   (91)
Balance, as adjusted   24,475
Other comprehensive income (loss) 549 (407)
Ending Balance 21,902 23,848
OTTI Gains (Losses) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 14 22
Cumulative effect adjustments from changes in accounting standards   4
Balance, as adjusted   26
Other comprehensive income (loss) before reclassifications, after tax 4 (10)
Reclassification of (gains) losses from accumulated other comprehensive income, after tax   1
Other comprehensive income (loss) 4 (9)
Amounts attributable to noncontrolling interests   1
Ending Balance 18 18
Unrealized Gains (Losses) on Investments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 57 673
Cumulative effect adjustments from changes in accounting standards   98
Balance, as adjusted   771
Other comprehensive income (loss) before reclassifications, after tax 521 (414)
Reclassification of (gains) losses from accumulated other comprehensive income, after tax 5 (15)
Other comprehensive income (loss) 526 (429)
Amounts attributable to noncontrolling interests (56) 44
Ending Balance 527 386
Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 5 0
Balance, as adjusted   0
Other comprehensive income (loss) before reclassifications, after tax (6) 8
Reclassification of (gains) losses from accumulated other comprehensive income, after tax   2
Other comprehensive income (loss) (6) 10
Ending Balance (1) 10
Pension Liability [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (793) (633)
Cumulative effect adjustments from changes in accounting standards   (130)
Balance, as adjusted   (763)
Other comprehensive income (loss) before reclassifications, after tax (1)  
Reclassification of (gains) losses from accumulated other comprehensive income, after tax 9 10
Other comprehensive income (loss) 8 10
Amounts attributable to noncontrolling interests (1)  
Ending Balance (786) (753)
Foreign Currency Translation [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (163) (88)
Balance, as adjusted   (88)
Other comprehensive income (loss) before reclassifications, after tax 17 11
Other comprehensive income (loss) 17 11
Amounts attributable to noncontrolling interests (2) (1)
Ending Balance (148) (78)
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (880) (26)
Cumulative effect adjustments from changes in accounting standards   (28)
Balance, as adjusted   (54)
Other comprehensive income (loss) before reclassifications, after tax 535 (405)
Reclassification of (gains) losses from accumulated other comprehensive income, after tax 14 (2)
Other comprehensive income (loss) 549 (407)
Amounts attributable to noncontrolling interests (59) 44
Ending Balance $ (390) $ (417)