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Deferred acquisition costs (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Deferred Policy Acquisition Cost [Line Items] |  |
Deferred Policy Acquisition Cost | $ 7,537 |
Balance – beginning of period | 7,152 |
Amortization expense | (2,207) | $ (1,948)
Balance - end of period | 7,537 |
Segment Life [Member] |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Amortization expense | (294) | (273)
Overseas General Insurance [Member] |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Amortization expense | (823) | (713)
Short-Duration Insurance, Other |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Deferred Policy Acquisition Cost | 3,510 | 3,003
Balance - end of period | 3,510 | 3,003
Long-Duration Insurance, Other |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Deferred Policy Acquisition Cost | 4,027 | 3,293
Balance - end of period | 4,027 | 3,293
Long-Duration Insurance, Other | Segment Life [Member] |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Deferred Policy Acquisition Cost | 3,411 | 2,651
Balance – beginning of period | 3,185 | 2,514
Capitalizations | 339 | 222
Amortization expense | (104) | (84)
Other (including foreign exchange) | (9) | (1)
Balance - end of period | 3,411 | 2,651
Long-Duration Insurance, Other | Overseas General Insurance [Member] |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Deferred Policy Acquisition Cost | 616 | 642
Balance - end of period | 616 | 642
Term Life Insurance | Segment Life [Member] |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Deferred Policy Acquisition Cost | 413 | 349
Balance – beginning of period | 402 | 324
Capitalizations | 47 | 42
Amortization expense | (28) | (24)
Other (including foreign exchange) | (8) | 7
Balance - end of period | 413 | 349
Universal Life | Segment Life [Member] |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Deferred Policy Acquisition Cost | 688 | 644
Balance – beginning of period | 674 | 639
Capitalizations | 33 | 25
Amortization expense | (20) | (19)
Other (including foreign exchange) | 1 | (1)
Balance - end of period | 688 | 644
Whole Life Insurance | Segment Life [Member] |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Deferred Policy Acquisition Cost | 608 | 424
Balance – beginning of period | 534 | 392
Capitalizations | 85 | 28
Amortization expense | (8) | (5)
Other (including foreign exchange) | (3) | 9
Balance - end of period | 608 | 424
Accident and Health Insurance Product Line [Member] | Segment Life [Member] |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Deferred Policy Acquisition Cost | 1,421 | 969
Balance – beginning of period | 1,301 | 891
Capitalizations | 158 | 123
Amortization expense | (41) | (30)
Other (including foreign exchange) | 3 | (15)
Balance - end of period | 1,421 | 969
Insurance, Other | Segment Life [Member] |  |
Deferred Policy Acquisition Cost [Line Items] |  |
Deferred Policy Acquisition Cost | 281 | 265
Balance – beginning of period | 274 | 268
Capitalizations | 16 | 4
Amortization expense | (7) | (6)
Other (including foreign exchange) | (2) | (1)
Balance - end of period | $ 281 | $ 265

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