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Investments - Amortized Cost and Fair Values of Fixed Maturity and Equity Securities (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost $ 38,157 $ 38,234
Gross Unrealized Gains 4,128 1,986
Gross Unrealized Losses 45 521
Estimated Fair Value 42,240 39,699
Unrealized OTTI Losses (Gains) (19) (20)
Corporate Bonds and Other [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 19,789 18,764
Gross Unrealized Gains 2,292 791
Gross Unrealized Losses 32 395
Estimated Fair Value 22,049 19,160
States, Municipalities and Political Subdivisions [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 9,093 9,681
Gross Unrealized Gains 1,559 1,076
Gross Unrealized Losses   9
Estimated Fair Value 10,652 10,748
Residential Mortgage-Backed [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 4,387 4,815
Gross Unrealized Gains 133 68
Gross Unrealized Losses 1 57
Estimated Fair Value 4,519 4,826
Unrealized OTTI Losses (Gains) (17) (20)
Commercial Mortgage-Backed [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 2,265 2,200
Gross Unrealized Gains 86 28
Gross Unrealized Losses 5 32
Estimated Fair Value 2,346 2,196
Unrealized OTTI Losses (Gains) 1  
Other Asset-Backed [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 1,925 1,975
Gross Unrealized Gains 41 11
Gross Unrealized Losses 4 24
Estimated Fair Value 1,962 1,962
Unrealized OTTI Losses (Gains) (3)  
Total Asset-Backed [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 8,577 8,990
Gross Unrealized Gains 260 107
Gross Unrealized Losses 10 113
Estimated Fair Value 8,827 8,984
Unrealized OTTI Losses (Gains) (19) (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 146 156
Gross Unrealized Gains 1 3
Gross Unrealized Losses 2  
Estimated Fair Value 145 159
Foreign Government [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 491 480
Gross Unrealized Gains 14 5
Gross Unrealized Losses 1 4
Estimated Fair Value 504 481
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 38,106 38,081
Gross Unrealized Gains 4,126 1,982
Gross Unrealized Losses 45 521
Estimated Fair Value 42,187 39,542
Unrealized OTTI Losses (Gains) (19) (20)
Fixed Maturities Trading [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 51 153
Gross Unrealized Gains 2 4
Estimated Fair Value $ 53 $ 157