XML 98 R90.htm IDEA: XBRL DOCUMENT v3.25.3
Long-duration insurance contracts - Summary of changes in discounted present values of expected future policy benefits and expected future net premiums (Detail) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]    
Balance at September 30 $ 18,275 $ 18,612
Periodic Payment Annuity [Member]    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]    
Balance at beginning of year 10,276 11,212
Balance at beginning of year at original discount rate 11,757 11,681
Effects of actual versus expected experience (17) 2
Change in benefits, net (373) (357)
Interest accrual 417 411
Foreign currency effect 110 96
Ending balance at original discount rate 11,894 11,833
Effects of changes in discount rate assumptions (1,316) (697)
Expected future policy benefits at September 30 10,578 11,136
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]    
Balance at September 30 10,578 11,136
Liabilities for future policy benefits at September 30, net of reinsurance recoverables 10,578 11,136
Life and Health [Member]    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]    
Balance at beginning of year 43,784 52,665
Balance at beginning of year at original discount rate 55,170 65,871
Effects of cash flow assumption changes (138) 1,485
Effects of actual versus expected experience 199 (12,709)
Change in benefits, net (1,434) (1,404)
Interest accrual 981 891
Foreign currency effect 1,728 218
Ending balance at original discount rate 56,506 54,352
Effects of changes in discount rate assumptions (11,122) (11,111)
Expected future policy benefits at September 30 45,384 43,241
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]    
Balance at beginning of year 39,294 46,916
Balance at beginning of year at original discount rate 49,500 58,731
Effects of cash flow assumption changes (97) 1,449
Effect of actual versus expected experience 164 (11,033)
Change in premiums, net (1,418) (1,348)
Interest accrual 879 791
Foreign currency effect 1,604 200
Ending balance at original discount rate 50,632 48,790
Effect of changes in discount rate assumptions (9,969) (10,005)
Expected future net premiums at June 30 40,663 38,785
Balance at September 30 4,721 4,456
Reinsurance recoverables (52) (52)
Liabilities for future policy benefits at September 30, net of reinsurance recoverables $ 4,669 $ 4,404