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Deferred acquisition costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | $ 6,856 |  | $ 6,856 |
Balance – beginning of period |  |  | 6,031 |
Amortization expense | (2,178) | $ (1,970) | (6,142) | $ (5,415)
Balance - end of period | 6,856 |  | 6,856 |
Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Amortization expense | (279) | (266) | (829) | (537)
Overseas General Insurance [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Amortization expense | (827) | (720) | (2,286) | (2,096)
Short-Duration Insurance, Other |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 3,283 | 2,809 | 3,283 | 2,809
Balance - end of period | 3,283 | 2,809 | 3,283 | 2,809
Long-Duration Insurance, Other |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 3,573 | 2,979 | 3,573 | 2,979
Balance - end of period | 3,573 | 2,979 | 3,573 | 2,979
Long-Duration Insurance, Other | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 2,952 | 2,346 | 2,952 | 2,346
Balance – beginning of period |  |  | 2,514 | 2,204
Capitalizations |  |  | 722 | 457
Amortization expense |  |  | (262) | (213)
Other (including foreign exchange) |  |  | (22) | (102)
Balance - end of period | 2,952 | 2,346 | 2,952 | 2,346
Long-Duration Insurance, Other | Overseas General Insurance [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 621 | 633 | 621 | 633
Balance - end of period | 621 | 633 | 621 | 633
Term Life Insurance | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 372 | 299 | 372 | 299
Balance – beginning of period |  |  | 320 | 246
Capitalizations |  |  | 118 | 111
Amortization expense |  |  | (74) | (56)
Other (including foreign exchange) |  |  | 8 | (2)
Balance - end of period | 372 | 299 | 372 | 299
Universal Life | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 784 | 761 | 784 | 761
Balance – beginning of period |  |  | 776 | 771
Capitalizations |  |  | 85 | 95
Amortization expense |  |  | (57) | (55)
Other (including foreign exchange) |  |  | (20) | (50)
Balance - end of period | 784 | 761 | 784 | 761
Whole Life Insurance | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 488 | 350 | 488 | 350
Balance – beginning of period |  |  | 395 | 334
Capitalizations |  |  | 102 | 46
Amortization expense |  |  | (16) | (14)
Other (including foreign exchange) |  |  | 7 | (16)
Balance - end of period | 488 | 350 | 488 | 350
Accident and Health Insurance Product Line [Member] | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 1,181 | 819 | 1,181 | 819
Balance – beginning of period |  |  | 902 | 745
Capitalizations |  |  | 392 | 166
Amortization expense |  |  | (100) | (72)
Other (including foreign exchange) |  |  | (13) | (20)
Balance - end of period | 1,181 | 819 | 1,181 | 819
Insurance, Other | Segment Life [Member] |  |  |  |
Deferred Policy Acquisition Cost [Line Items] |  |  |  |
Deferred Policy Acquisition Cost | 127 | 117 | 127 | 117
Balance – beginning of period |  |  | 121 | 108
Capitalizations |  |  | 25 | 39
Amortization expense |  |  | (15) | (16)
Other (including foreign exchange) |  |  | (4) | (14)
Balance - end of period | $ 127 | $ 117 | $ 127 | $ 117

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