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Investments in fixed maturity securities (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Amortized cost of fixed maturity securities | $ 16,969 | $ 23,525
Unrealized gains on fixed maturity securities | 285 | 334
Unrealized losses on fixed maturity securities | (87) | (101)
Fair value of fixed maturity securities | 17,167 | 23,758
U.S. Treasury, U.S. government corporations and agencies [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Amortized cost of fixed maturity securities | 4,517 | 10,308
Unrealized gains on fixed maturity securities | 3 | 14
Unrealized losses on fixed maturity securities | (17) | (53)
Fair value of fixed maturity securities | 4,503 | 10,269
Foreign governments [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Amortized cost of fixed maturity securities | 11,020 | 11,788
Unrealized gains on fixed maturity securities | 39 | 58
Unrealized losses on fixed maturity securities | (62) | (41)
Fair value of fixed maturity securities | 10,997 | 11,805
Corporate bonds [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Amortized cost of fixed maturity securities | 1,210 | 1,212
Unrealized gains on fixed maturity securities | 224 | 241
Unrealized losses on fixed maturity securities | (5) | (4)
Fair value of fixed maturity securities | 1,429 | 1,449
Other [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Amortized cost of fixed maturity securities | 222 | 217
Unrealized gains on fixed maturity securities | 19 | 21
Unrealized losses on fixed maturity securities | (3) | (3)
Fair value of fixed maturity securities | $ 238 | $ 235

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