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Investments in fixed maturity securities (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	$ 15,700	$ 23,525
Unrealized gains on fixed maturity securities	355	334
Unrealized losses on fixed maturity securities	(13)	(101)
Fair value of fixed maturity securities	16,042	23,758
U.S. Treasury, U.S. government corporations and agencies [Member]
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	4,482	10,308
Unrealized gains on fixed maturity securities	36	14
Unrealized losses on fixed maturity securities	(2)	(53)
Fair value of fixed maturity securities	4,516	10,269
Foreign governments [Member]
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	9,855	11,788
Unrealized gains on fixed maturity securities	55	58
Unrealized losses on fixed maturity securities	(6)	(41)
Fair value of fixed maturity securities	9,904	11,805
Corporate bonds [Member]
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	1,154	1,212
Unrealized gains on fixed maturity securities	243	241
Unrealized losses on fixed maturity securities	(3)	(4)
Fair value of fixed maturity securities	1,394	1,449
Other [Member]
Summary of Investment Holdings [Line Items]
Amortized cost of fixed maturity securities	209	217
Unrealized gains on fixed maturity securities	21	21
Unrealized losses on fixed maturity securities	(2)	(3)
Fair value of fixed maturity securities	$ 228	$ 235

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