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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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