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Investments - Amortized Cost and Fair Values of Fixed Maturity and Equity Securities (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost $ 38,045 $ 38,234
Gross Unrealized Gains 3,675 1,986
Gross Unrealized Losses 57 521
Estimated Fair Value 41,663 39,699
Unrealized OTTI Losses (Gains) (26) (20)
Corporate Bonds and Other [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 19,654 18,764
Gross Unrealized Gains 1,880 791
Gross Unrealized Losses 44 395
Estimated Fair Value 21,490 19,160
States, Municipalities and Political Subdivisions [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 9,196 9,681
Gross Unrealized Gains 1,507 1,076
Gross Unrealized Losses   9
Estimated Fair Value 10,703 10,748
Residential Mortgage-Backed [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 4,668 4,815
Gross Unrealized Gains 131 68
Gross Unrealized Losses 2 57
Estimated Fair Value 4,797 4,826
Unrealized OTTI Losses (Gains) (24) (20)
Commercial Mortgage-Backed [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 2,032 2,200
Gross Unrealized Gains 93 28
Gross Unrealized Losses 4 32
Estimated Fair Value 2,121 2,196
Other Asset-Backed [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 1,865 1,975
Gross Unrealized Gains 40 11
Gross Unrealized Losses 7 24
Estimated Fair Value 1,898 1,962
Unrealized OTTI Losses (Gains) (2)  
Total Asset-Backed [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 8,565 8,990
Gross Unrealized Gains 264 107
Gross Unrealized Losses 13 113
Estimated Fair Value 8,816 8,984
Unrealized OTTI Losses (Gains) (26) (20)
U.S. Treasury and obligations of government-sponsored enterprises [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 118 156
Gross Unrealized Gains 5 3
Estimated Fair Value 123 159
Foreign Government [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 480 480
Gross Unrealized Gains 17 5
Gross Unrealized Losses   4
Estimated Fair Value 497 481
Redeemable Preferred Stock [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 10 10
Estimated Fair Value 10 10
Total Fixed Maturities Available-for-Sale [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 38,023 38,081
Gross Unrealized Gains 3,673 1,982
Gross Unrealized Losses 57 521
Estimated Fair Value 41,639 39,542
Unrealized OTTI Losses (Gains) (26) (20)
Fixed Maturities Trading [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 22 153
Gross Unrealized Gains 2 4
Estimated Fair Value $ 24 $ 157