v3.26.3
Future policy benefits (Rollforward) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Liability for Future Policy Benefit, Activity [Line Items]      
Deferred profit liability $ 3,421 $ 2,353  
Net liability for future policy benefits, before reinsurance recoverable 21,133 18,288 $ 18,420
Reinsurance recoverable on policy benefits [1] 306   $ 286
Segment Life [Member]      
Liability for Future Policy Benefit, Activity [Line Items]      
Balance – beginning of period 18,407 17,679  
Beginning balance at original discount rate 18,518 17,745  
Effect of changes in cash flow assumptions (19) (503)  
Effect of actual variances from expected experience (299) (196)  
Adjusted beginning of period balance 18,200 17,046  
Issuances 3,618 3,356  
Interest accrual 548 571  
Net premiums collected (1) [2] (2,971) (2,640)  
Other (including foreign exchange) 975 554  
Ending balance at original discount rate 20,370 18,887  
Effect of changes in discount rate assumptions (984) 69  
Balance – end of period 19,386 18,956  
Balance – beginning of period 32,775 30,635  
Beginning balance at original discount rate 32,551 30,142  
Effect of changes in cash flow assumptions 24 (568)  
Effect of actual variances from expected experience (331) (192)  
Adjusted beginning of period balance 32,244 29,382  
Issuances 3,618 3,356  
Interest accrual 919 880  
Benefits payments (1,765) (1,758)  
Other (including foreign exchange) 1,411 923  
Ending balance at original discount rate 36,427 32,783  
Effect of changes in discount rate assumptions (1,180) 572  
Balance – end of period 35,247 33,355  
Net liability for future policy benefits 15,861 14,399  
Deferred profit liability 3,421 2,353  
Net liability for future policy benefits, before reinsurance recoverable 19,282 16,752  
Reinsurance recoverable on policy benefits 284 273  
Net liability for future policy benefits, after reinsurance recoverable $ 18,998 $ 16,479  
Weighted average duration (years) 21 years 9 months 18 days 21 years 8 months 12 days  
Other Segments      
Liability for Future Policy Benefit, Activity [Line Items]      
Net liability for future policy benefits, before reinsurance recoverable [3] $ 1,851 $ 1,536  
Term Life Insurance | Segment Life [Member]      
Liability for Future Policy Benefit, Activity [Line Items]      
Balance – beginning of period 1,544 1,523  
Beginning balance at original discount rate 1,814 1,819  
Effect of changes in cash flow assumptions (93) (56)  
Effect of actual variances from expected experience (17) 5  
Adjusted beginning of period balance 1,704 1,768  
Issuances 186 166  
Interest accrual 40 43  
Net premiums collected (1) [2] (194) (188)  
Other (including foreign exchange) 87 47  
Ending balance at original discount rate 1,823 1,836  
Effect of changes in discount rate assumptions (294) (253)  
Balance – end of period 1,529 1,583  
Balance – beginning of period 2,313 2,238  
Beginning balance at original discount rate 2,715 2,647  
Effect of changes in cash flow assumptions (90) (54)  
Effect of actual variances from expected experience (11) 9  
Adjusted beginning of period balance 2,614 2,602  
Issuances 186 166  
Interest accrual 58 58  
Benefits payments (172) (170)  
Other (including foreign exchange) 80 74  
Ending balance at original discount rate 2,766 2,730  
Effect of changes in discount rate assumptions (481) (385)  
Balance – end of period 2,285 2,345  
Net liability for future policy benefits 756 762  
Deferred profit liability 323 309  
Net liability for future policy benefits, before reinsurance recoverable 1,079 1,071  
Reinsurance recoverable on policy benefits 107 101  
Net liability for future policy benefits, after reinsurance recoverable $ 972 $ 970  
Weighted average duration (years) 11 years 1 month 6 days 10 years 8 months 12 days  
Whole Life Insurance | Segment Life [Member]      
Liability for Future Policy Benefit, Activity [Line Items]      
Balance – beginning of period $ 4,749 $ 4,405  
Beginning balance at original discount rate 4,616 4,303  
Effect of changes in cash flow assumptions (9) (65)  
Effect of actual variances from expected experience 39 13  
Adjusted beginning of period balance 4,646 4,251  
Issuances 1,235 1,280  
Interest accrual 110 107  
Net premiums collected (1) [2] (1,331) (1,192)  
Other (including foreign exchange) 132 170  
Ending balance at original discount rate 4,792 4,616  
Effect of changes in discount rate assumptions 19 154  
Balance – end of period 4,811 4,770  
Balance – beginning of period 13,791 12,057  
Beginning balance at original discount rate 13,133 11,242  
Effect of changes in cash flow assumptions (1) (93)  
Effect of actual variances from expected experience 45 11  
Adjusted beginning of period balance 13,177 11,160  
Issuances 1,235 1,280  
Interest accrual 350 291  
Benefits payments (276) (243)  
Other (including foreign exchange) 458 394  
Ending balance at original discount rate 14,944 12,882  
Effect of changes in discount rate assumptions 263 820  
Balance – end of period 15,207 13,702  
Net liability for future policy benefits 10,396 8,932  
Deferred profit liability 2,665 1,744  
Net liability for future policy benefits, before reinsurance recoverable 13,061 10,676  
Reinsurance recoverable on policy benefits 47 48  
Net liability for future policy benefits, after reinsurance recoverable $ 13,014 $ 10,628  
Weighted average duration (years) 25 years 7 months 6 days 27 years  
Accident and Health Insurance Product Line [Member] | Segment Life [Member]      
Liability for Future Policy Benefit, Activity [Line Items]      
Balance – beginning of period $ 11,688 $ 11,626  
Beginning balance at original discount rate 11,665 11,499  
Effect of changes in cash flow assumptions 78 (389)  
Effect of actual variances from expected experience (326) (213)  
Adjusted beginning of period balance 11,417 10,897  
Issuances 1,717 1,542  
Interest accrual 387 413  
Net premiums collected (1) [2] (1,186) (1,145)  
Other (including foreign exchange) 740 330  
Ending balance at original discount rate 13,075 12,037  
Effect of changes in discount rate assumptions (708) 164  
Balance – end of period 12,367 12,201  
Balance – beginning of period 15,587 15,693  
Beginning balance at original discount rate 15,645 15,652  
Effect of changes in cash flow assumptions 109 (434)  
Effect of actual variances from expected experience (370) (212)  
Adjusted beginning of period balance 15,384 15,006  
Issuances 1,717 1,542  
Interest accrual 483 511  
Benefits payments (1,300) (1,331)  
Other (including foreign exchange) 824 430  
Ending balance at original discount rate 17,108 16,158  
Effect of changes in discount rate assumptions (973) 101  
Balance – end of period 16,135 16,259  
Net liability for future policy benefits 3,768 4,058  
Deferred profit liability 277 231  
Net liability for future policy benefits, before reinsurance recoverable 4,045 4,289  
Reinsurance recoverable on policy benefits 130 123  
Net liability for future policy benefits, after reinsurance recoverable $ 3,915 $ 4,166  
Weighted average duration (years) 10 years 10 years  
Insurance, Other | Segment Life [Member]      
Liability for Future Policy Benefit, Activity [Line Items]      
Balance – beginning of period $ 426 $ 125  
Beginning balance at original discount rate 423 124  
Effect of changes in cash flow assumptions 5 7  
Effect of actual variances from expected experience 5 (1)  
Adjusted beginning of period balance 433 130  
Issuances 480 368  
Interest accrual 11 8  
Net premiums collected (1) [2] (260) (115)  
Other (including foreign exchange) 16 7  
Ending balance at original discount rate 680 398  
Effect of changes in discount rate assumptions (1) 4  
Balance – end of period 679 402  
Balance – beginning of period 1,084 647  
Beginning balance at original discount rate 1,058 601  
Effect of changes in cash flow assumptions 6 13  
Effect of actual variances from expected experience 5 0  
Adjusted beginning of period balance 1,069 614  
Issuances 480 368  
Interest accrual 28 20  
Benefits payments (17) (14)  
Other (including foreign exchange) 49 25  
Ending balance at original discount rate 1,609 1,013  
Effect of changes in discount rate assumptions 11 36  
Balance – end of period 1,620 1,049  
Net liability for future policy benefits 941 647  
Deferred profit liability 156 69  
Net liability for future policy benefits, before reinsurance recoverable 1,097 716  
Reinsurance recoverable on policy benefits 0 1  
Net liability for future policy benefits, after reinsurance recoverable $ 1,097 $ 715  
Weighted average duration (years) 28 years 6 months 25 years 8 months 12 days  
[1] Net of valuation allowance for uncollectible reinsurance.
[2] Net premiums collected represent the portion of gross premiums collected from policyholders that is used to fund expected benefits.
[3] Other business principally comprises certain Overseas General Insurance accident and health (A&H) policies and certain Chubb Life Re business.