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Investments in fixed maturity securities (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	$ 16,603	$ 23,525
Unrealized gains on fixed maturity securities	262	334
Unrealized losses on fixed maturity securities	(63)	(101)
Fair value of fixed maturity securities	16,802	23,758
U.S. Treasury, U.S. government corporations and agencies [Member]
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	4,773	10,308
Unrealized gains on fixed maturity securities	3	14
Unrealized losses on fixed maturity securities	(13)	(53)
Fair value of fixed maturity securities	4,763	10,269
Foreign governments [Member]
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	10,430	11,788
Unrealized gains on fixed maturity securities	31	58
Unrealized losses on fixed maturity securities	(42)	(41)
Fair value of fixed maturity securities	10,419	11,805
Corporate bonds [Member]
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	1,180	1,212
Unrealized gains on fixed maturity securities	211	241
Unrealized losses on fixed maturity securities	(5)	(4)
Fair value of fixed maturity securities	1,386	1,449
Other [Member]
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	220	217
Unrealized gains on fixed maturity securities	17	21
Unrealized losses on fixed maturity securities	(3)	(3)
Fair value of fixed maturity securities	$ 234	$ 235

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