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Investments in fixed maturity securities (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Summary of Investment Holdings [Line Items]    
Amortized cost of fixed maturity securities $ 19,274 $ 19,427
Unrealized gains on fixed maturity securities 711 546
Unrealized losses on fixed maturity securities (23) (75)
Fair value of fixed maturity securities 19,962 19,898
U.S. Treasury, U.S. government corporations and agencies [Member]    
Summary of Investment Holdings [Line Items]    
Amortized cost of fixed maturity securities 4,542 4,223
Unrealized gains on fixed maturity securities 46 22
Unrealized losses on fixed maturity securities (4) (22)
Fair value of fixed maturity securities 4,584 4,223
States, municipalities and political subdivisions [Member]    
Summary of Investment Holdings [Line Items]    
Amortized cost of fixed maturity securities 154 182
Unrealized gains on fixed maturity securities 6 7
Fair value of fixed maturity securities 160 189
Foreign governments [Member]    
Summary of Investment Holdings [Line Items]    
Amortized cost of fixed maturity securities 7,903 7,480
Unrealized gains on fixed maturity securities 76 50
Unrealized losses on fixed maturity securities (14) (28)
Fair value of fixed maturity securities 7,965 7,502
Corporate bonds [Member]    
Summary of Investment Holdings [Line Items]    
Amortized cost of fixed maturity securities 6,231 7,055
Unrealized gains on fixed maturity securities 516 408
Unrealized losses on fixed maturity securities (3) (23)
Fair value of fixed maturity securities 6,744 7,440
Mortgage-backed securities [Member]    
Summary of Investment Holdings [Line Items]    
Amortized cost of fixed maturity securities 444 487
Unrealized gains on fixed maturity securities 67 59
Unrealized losses on fixed maturity securities (2) (2)
Fair value of fixed maturity securities $ 509 $ 544