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Deferred acquisition costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | $ 8,249 | $ 6,856 | $ 8,249 | $ 6,856
Balance – beginning of period |  |  | 7,152 |
Amortization expense | (2,324) | (2,178) | (6,757) | (6,142)
Balance – end of period | 8,249 | 6,856 | 8,249 | 6,856
Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Amortization expense | (291) | (279) | (885) | (829)
Overseas General Insurance [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Amortization expense | (852) | (827) | (2,517) | (2,286)
Short-Duration Insurance, Other |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 3,735 | 3,283 | 3,735 | 3,283
Balance – end of period | 3,735 | 3,283 | 3,735 | 3,283
Long-Duration Insurance, Other |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 4,514 | 3,573 | 4,514 | 3,573
Balance – end of period | 4,514 | 3,573 | 4,514 | 3,573
Long-Duration Insurance, Other | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 3,899 | 2,952 | 3,899 | 2,952
Balance – beginning of period |  |  | 3,185 | 2,514
Capitalizations |  |  | 1,054 | 742
Amortization expense |  |  | (328) | (266)
Other (including foreign exchange) |  |  | (12) | (38)
Balance – end of period | 3,899 | 2,952 | 3,899 | 2,952
Long-Duration Insurance, Other | Overseas General Insurance [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 615 | 621 | 615 | 621
Balance – end of period | 615 | 621 | 615 | 621
Term Life Insurance | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 461 | 377 | 461 | 377
Balance – beginning of period |  |  | 402 | 324
Capitalizations |  |  | 149 | 131
Amortization expense |  |  | (89) | (76)
Other (including foreign exchange) |  |  | (1) | (2)
Balance – end of period | 461 | 377 | 461 | 377
Universal Life | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 721 | 651 | 721 | 651
Balance – beginning of period |  |  | 674 | 639
Capitalizations |  |  | 109 | 85
Amortization expense |  |  | (60) | (55)
Other (including foreign exchange) |  |  | (2) | (18)
Balance – end of period | 721 | 651 | 721 | 651
Whole Life Insurance | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 785 | 480 | 785 | 480
Balance – beginning of period |  |  | 534 | 392
Capitalizations |  |  | 276 | 103
Amortization expense |  |  | (27) | (18)
Other (including foreign exchange) |  |  | 2 | 3
Balance – end of period | 785 | 480 | 785 | 480
Accident and Health Insurance Product Line [Member] | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 1,628 | 1,170 | 1,628 | 1,170
Balance – beginning of period |  |  | 1,301 | 891
Capitalizations |  |  | 467 | 396
Amortization expense |  |  | (132) | (98)
Other (including foreign exchange) |  |  | (8) | (19)
Balance – end of period | 1,628 | 1,170 | 1,628 | 1,170
Insurance, Other | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 304 | 274 | 304 | 274
Balance – beginning of period |  |  | 274 | 268
Capitalizations |  |  | 53 | 27
Amortization expense |  |  | (20) | (19)
Other (including foreign exchange) |  |  | (3) | (2)
Balance – end of period | $ 304 | $ 274 | $ 304 | $ 274

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