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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