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Deferred acquisition costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Deferred Policy Acquisition Cost [Line Items]    
Deferred Policy Acquisition Cost $ 6,296  
Balance – beginning of period 6,031  
Amortization expense (1,948) $ (1,719)
Balance - end of period 6,296  
Segment Life [Member]    
Deferred Policy Acquisition Cost [Line Items]    
Amortization expense (273) (133)
Overseas General Insurance [Member]    
Deferred Policy Acquisition Cost [Line Items]    
Amortization expense (713) (679)
Term Life Insurance | Segment Life [Member]    
Deferred Policy Acquisition Cost [Line Items]    
Deferred Policy Acquisition Cost 337 269
Balance – beginning of period 320 246
Capitalizations 36 34
Amortization expense (24) (16)
Other (including foreign exchange) 5 5
Balance - end of period 337 269
Universal Life | Segment Life [Member]    
Deferred Policy Acquisition Cost [Line Items]    
Deferred Policy Acquisition Cost 783 774
Balance – beginning of period 776 771
Capitalizations 25 29
Amortization expense (19) (18)
Other (including foreign exchange) 1 (8)
Balance - end of period 783 774
Whole Life Insurance | Segment Life [Member]    
Deferred Policy Acquisition Cost [Line Items]    
Deferred Policy Acquisition Cost 413 337
Balance – beginning of period 395 334
Capitalizations 24 10
Amortization expense (5) (5)
Other (including foreign exchange) (1) (2)
Balance - end of period 413 337
Accident and Health Insurance Product Line [Member] | Segment Life [Member]    
Deferred Policy Acquisition Cost [Line Items]    
Deferred Policy Acquisition Cost 991 744
Balance – beginning of period 902 745
Capitalizations 126 24
Amortization expense (30) (25)
Other (including foreign exchange) (7) 0
Balance - end of period 991 744
Insurance, Other | Segment Life [Member]    
Deferred Policy Acquisition Cost [Line Items]    
Deferred Policy Acquisition Cost 119 120
Balance – beginning of period 121 108
Capitalizations 3 20
Amortization expense (5) (5)
Other (including foreign exchange) 0 (3)
Balance - end of period 119 120
Short-Duration Insurance, Other    
Deferred Policy Acquisition Cost [Line Items]    
Deferred Policy Acquisition Cost 3,010 2,808
Balance - end of period 3,010 2,808
Long-Duration Insurance, Other    
Deferred Policy Acquisition Cost [Line Items]    
Deferred Policy Acquisition Cost 3,286 2,974
Balance - end of period 3,286 2,974
Long-Duration Insurance, Other | Segment Life [Member]    
Deferred Policy Acquisition Cost [Line Items]    
Deferred Policy Acquisition Cost 2,643 2,244
Balance – beginning of period 2,514 2,204
Capitalizations 214 117
Amortization expense (83) (69)
Other (including foreign exchange) (2) (8)
Balance - end of period 2,643 2,244
Long-Duration Insurance, Other | Overseas General Insurance [Member]    
Deferred Policy Acquisition Cost [Line Items]    
Deferred Policy Acquisition Cost 643 730
Balance - end of period $ 643 $ 730