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Deferred acquisition costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – beginning of period |  |  | $ 8,358 |
Amortization expense | $ (2,415) | $ (2,226) | (4,728) | $ (4,433)
Balance – end of period | 9,437 | 7,812 | 9,437 | 7,812
Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Amortization expense | (319) | (300) | (629) | (594)
Overseas General Insurance [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Amortization expense | (913) | (842) | (1,750) | (1,665)
Short-Duration Insurance, Other |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – end of period | 4,085 | 3,646 | 4,085 | 3,646
Long-Duration Insurance, Other |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – end of period | 5,352 | 4,166 | 5,352 | 4,166
Long-Duration Insurance, Other | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – beginning of period |  |  | 4,066 | 3,185
Capitalizations |  |  | 796 | 685
Amortization expense |  |  | (265) | (214)
Other (including foreign exchange) |  |  | 109 | (82)
Balance – end of period | 4,706 | 3,574 | 4,706 | 3,574
Long-Duration Insurance, Other | Overseas General Insurance [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – end of period | 646 | 592 | 646 | 592
Term Life Insurance | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – beginning of period |  |  | 469 | 402
Capitalizations |  |  | 115 | 98
Amortization expense |  |  | (73) | (58)
Other (including foreign exchange) |  |  | 13 | (6)
Balance – end of period | 524 | 436 | 524 | 436
Universal Life | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – beginning of period |  |  | 722 | 674
Capitalizations |  |  | 69 | 70
Amortization expense |  |  | (41) | (39)
Other (including foreign exchange) |  |  | 10 | (25)
Balance – end of period | 760 | 680 | 760 | 680
Whole Life Insurance | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – beginning of period |  |  | 870 | 534
Capitalizations |  |  | 224 | 170
Amortization expense |  |  | (25) | (17)
Other (including foreign exchange) |  |  | 23 | (14)
Balance – end of period | 1,092 | 673 | 1,092 | 673
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 |  |  | 327 | 311
Amortization expense |  |  | (111) | (86)
Other (including foreign exchange) |  |  | 51 | (30)
Balance – end of period | 1,948 | 1,496 | 1,948 | 1,496
Insurance, Other | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Balance – beginning of period |  |  | 324 | 274
Capitalizations |  |  | 61 | 36
Amortization expense |  |  | (15) | (14)
Other (including foreign exchange) |  |  | 12 | (7)
Balance – end of period | $ 382 | $ 289 | $ 382 | $ 289

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