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Long-duration insurance contracts - Summary of life, annuity and health insurance benefits liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Liabilities for Guarantees on Long-Duration Contracts [Line Items] |  |  |
Life, annuity and health insurance benefits | $ 20,213 | $ 19,753 | $ 27,295
Periodic Payment Annuities [Member] |  |  |
Liabilities for Guarantees on Long-Duration Contracts [Line Items] |  |  |
Life, annuity and health insurance benefits | 11,212 | 10,640 | 16,153
Life and Health [Member] |  |  |
Liabilities for Guarantees on Long-Duration Contracts [Line Items] |  |  |
Life, annuity and health insurance benefits | 5,749 | 5,879 | 7,688
Other liabilities [Member] |  |  |
Liabilities for Guarantees on Long-Duration Contracts [Line Items] |  |  |
Life, annuity and health insurance benefits | $ 3,252 | $ 3,234 | $ 3,454

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