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Investments in fixed maturity securities - Amortized cost and estimated fair value of securities with fixed maturities (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Summary of Investment Holdings [Line Items]
Due in one year or less - amortized cost	$ 12,780
Due after one year through five years - amortized cost	4,179
Due after five years through ten years - amortized cost	498
Due after ten years - amortized cost	109
Amortized cost of mortgage-backed securities	109
Amortized cost of fixed maturity securities	17,675	$ 15,214
Due in one year or less - fair value	12,829
Due after one year through five years - fair value	4,179
Due after five years through ten years - fair value	693
Due after ten years - fair value	120
Fair value of mortgage-backed securities	122
Fair value of fixed maturity securities	$ 17,943	$ 15,364

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