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Deferred acquisition costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – beginning of period |  |  | $ 8,358 |
Amortization expense | $ (2,563) | $ (2,324) | (7,291) | $ (6,757)
Balance – end of period | 9,809 | 8,249 | 9,809 | 8,249
Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Amortization expense | (359) | (291) | (988) | (885)
Overseas General Insurance [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Amortization expense | (975) | (852) | (2,725) | (2,517)
Short-Duration Insurance, Other |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – end of period | 4,197 | 3,735 | 4,197 | 3,735
Long-Duration Insurance, Other |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – end of period | 5,612 | 4,514 | 5,612 | 4,514
Long-Duration Insurance, Other | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – beginning of period |  |  | 4,066 | 3,185
Capitalizations |  |  | 1,211 | 1,054
Amortization expense |  |  | (407) | (328)
Other (including foreign exchange) |  |  | 79 | (12)
Balance – end of period | 4,949 | 3,899 | 4,949 | 3,899
Long-Duration Insurance, Other | Overseas General Insurance [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – end of period | 663 | 615 | 663 | 615
Term Life Insurance | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – beginning of period |  |  | 469 | 402
Capitalizations |  |  | 175 | 149
Amortization expense |  |  | (111) | (89)
Other (including foreign exchange) |  |  | 8 | (1)
Balance – end of period | 541 | 461 | 541 | 461
Universal Life | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – beginning of period |  |  | 722 | 674
Capitalizations |  |  | 90 | 109
Amortization expense |  |  | (62) | (60)
Other (including foreign exchange) |  |  | 5 | (2)
Balance – end of period | 755 | 721 | 755 | 721
Whole Life Insurance | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – beginning of period |  |  | 870 | 534
Capitalizations |  |  | 347 | 276
Amortization expense |  |  | (39) | (27)
Other (including foreign exchange) |  |  | 21 | 2
Balance – end of period | 1,199 | 785 | 1,199 | 785
Accident and Health Insurance Product Line [Member] | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – beginning of period |  |  | 1,681 | 1,301
Capitalizations |  |  | 521 | 467
Amortization expense |  |  | (172) | (132)
Other (including foreign exchange) |  |  | 33 | (8)
Balance – end of period | 2,063 | 1,628 | 2,063 | 1,628
Insurance, Other | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – beginning of period |  |  | 324 | 274
Capitalizations |  |  | 78 | 53
Amortization expense |  |  | (23) | (20)
Other (including foreign exchange) |  |  | 12 | (3)
Balance – end of period | $ 391 | $ 304 | $ 391 | $ 304

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