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Future policy benefits (Undiscounted & discounted FPB) (Details) - Segment Life [Member] - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]        
Discounted expected future benefit payments $ 33,355 $ 30,635 $ 31,056 $ 27,462
Term Life Insurance        
Liability for Future Policy Benefit, Activity [Line Items]        
Undiscounted expected future benefit payments 4,498   4,188  
Undiscounted expected future gross premiums 6,844   6,669  
Discounted expected future benefit payments 2,345 2,238 2,309 2,254
Discounted expected future gross premiums 4,609   4,504  
Whole Life Insurance        
Liability for Future Policy Benefit, Activity [Line Items]        
Undiscounted expected future benefit payments 32,059   28,111  
Undiscounted expected future gross premiums 11,115   10,363  
Discounted expected future benefit payments 13,702 12,057 11,909 10,063
Discounted expected future gross premiums 9,180   8,404  
Accident and Health Insurance Product Line [Member]        
Liability for Future Policy Benefit, Activity [Line Items]        
Undiscounted expected future benefit payments 27,189   27,423  
Undiscounted expected future gross premiums 40,031   40,183  
Discounted expected future benefit payments 16,259 15,693 16,219 14,650
Discounted expected future gross premiums 24,049   23,655  
Insurance, Other        
Liability for Future Policy Benefit, Activity [Line Items]        
Undiscounted expected future benefit payments 1,900   1,046  
Undiscounted expected future gross premiums 606   200  
Discounted expected future benefit payments 1,049 $ 647 619 $ 495
Discounted expected future gross premiums $ 567   $ 177