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Investments - Amortized Cost and Fair Values of Fixed Maturity and Equity Securities (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost $ 37,985 $ 38,234
Gross Unrealized Gains 2,757 1,986
Gross Unrealized Losses 140 521
Estimated Fair Value 40,602 39,699
Unrealized OTTI Losses (Gains) (25) (20)
Corporate Bonds and Other [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 19,296 18,764
Gross Unrealized Gains 1,269 791
Gross Unrealized Losses 99 395
Estimated Fair Value 20,466 19,160
States, Municipalities and Political Subdivisions [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 9,279 9,681
Gross Unrealized Gains 1,299 1,076
Gross Unrealized Losses   9
Estimated Fair Value 10,578 10,748
Residential Mortgage-Backed [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 4,760 4,815
Gross Unrealized Gains 92 68
Gross Unrealized Losses 20 57
Estimated Fair Value 4,832 4,826
Unrealized OTTI Losses (Gains) (22) (20)
Commercial Mortgage-Backed [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 2,026 2,200
Gross Unrealized Gains 53 28
Gross Unrealized Losses 7 32
Estimated Fair Value 2,072 2,196
Other Asset-Backed [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 1,877 1,975
Gross Unrealized Gains 25 11
Gross Unrealized Losses 12 24
Estimated Fair Value 1,890 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 8,663 8,990
Gross Unrealized Gains 170 107
Gross Unrealized Losses 39 113
Estimated Fair Value 8,794 8,984
Unrealized OTTI Losses (Gains) (25) (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 162 156
Gross Unrealized Gains 3 3
Gross Unrealized Losses 1  
Estimated Fair Value 164 159
Foreign Government [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 502 480
Gross Unrealized Gains 12 5
Gross Unrealized Losses 1 4
Estimated Fair Value 513 481
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 37,912 38,081
Gross Unrealized Gains 2,753 1,982
Gross Unrealized Losses 140 521
Estimated Fair Value 40,525 39,542
Unrealized OTTI Losses (Gains) (25) (20)
Fixed Maturities Trading [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Cost or Amortized Cost 73 153
Gross Unrealized Gains 4 4
Estimated Fair Value $ 77 $ 157