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Investments in fixed maturity securities - Amortized cost and estimated fair value of securities with fixed maturities (Detail) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Summary of Investment Holdings [Line Items]
Due in one year or less - amortized cost	$ 11,002
Due after one year through five years - amortized cost	4,754
Due after five years through ten years - amortized cost	577
Due after ten years - amortized cost	129
Amortized cost of mortgage-backed securities	141
Amortized cost of fixed maturity securities	16,603	$ 23,525
Due in one year or less - fair value	10,990
Due after one year through five years - fair value	4,756
Due after five years through ten years - fair value	766
Due after ten years - fair value	139
Fair value of mortgage-backed securities	151
Fair value of fixed maturity securities	$ 16,802	$ 23,758

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