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Future policy benefits (Undiscounted & discounted FPB) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Liability for Future Policy Benefit, Activity [Line Items]        
Discounted expected future benefit payments $ 21,782 $ 21,920 $ 10,131 $ 10,775
Term Life Insurance | Segment Life [Member]        
Liability for Future Policy Benefit, Activity [Line Items]        
Undiscounted expected future benefit payments 2,352   1,309  
Undiscounted expected future gross premiums 2,673   1,437  
Discounted expected future benefit payments 1,390 1,429 890 921
Discounted expected future gross premiums 1,787   1,122  
Whole Life Insurance | Segment Life [Member]        
Liability for Future Policy Benefit, Activity [Line Items]        
Undiscounted expected future benefit payments 14,656   9,870  
Undiscounted expected future gross premiums 5,375   3,531  
Discounted expected future benefit payments 4,614 4,781 4,394 4,785
Discounted expected future gross premiums 3,994   2,597  
Accident and Health Insurance Product Line [Member] | Segment Life [Member]        
Liability for Future Policy Benefit, Activity [Line Items]        
Undiscounted expected future benefit payments 21,563   6,027  
Undiscounted expected future gross premiums 31,611   8,914  
Discounted expected future benefit payments 15,540 15,457 4,709 4,939
Discounted expected future gross premiums 18,958   6,209  
Insurance, Other | Segment Life [Member]        
Liability for Future Policy Benefit, Activity [Line Items]        
Undiscounted expected future benefit payments 370   215  
Undiscounted expected future gross premiums 97   74  
Discounted expected future benefit payments 238 $ 253 138 $ 130
Discounted expected future gross premiums $ 87   $ 65