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Investments - Pledged investments (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Available for sale debt securities $ 5,071 $ 2,655  
Securities collateral pledged to us 5,071 2,655  
Amounts borrowed under repurchase and securities lending agreements 5,000 2,500  
Securities pledged under repurchase agreements 5,071 2,655  
Total carrying values of cash and securities deposited under requirements of regulatory authorities or other insurance-related arrangements 10,400 8,100  
Federal Home Loan Bank stock 277 268  
Loans 52,421 47,565  
Policyholder contract deposits 172,177 162,050 $ 159,858
Guaranteed Investment Contract      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Policyholder contract deposits 113 53  
Asset Pledged as Collateral | Federal Home Loan Bank Advances      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Available for sale debt securities 4,400 4,800  
Loans 3,100 3,000  
Asset Pledged as Collateral | Deposits      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Available for sale debt securities 103 63  
Asset Pledged as Collateral | Collateralized Reinsurance Transactions      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Available for sale debt securities 616 490  
Non-U.S. governments      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 52 209  
Corporate debt      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 5,019 2,446  
Overnight and Continuous      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 13 38  
Overnight and Continuous | Non-U.S. governments      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 0 0  
Overnight and Continuous | Corporate debt      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 13 38  
Up to 30 Days      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 5,019 2,617  
Up to 30 Days | Non-U.S. governments      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 52 209  
Up to 30 Days | Corporate debt      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 4,967 2,408  
31 - 90 Days      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 39 0  
31 - 90 Days | Non-U.S. governments      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 0 0  
31 - 90 Days | Corporate debt      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 39 0  
91 - 364 Days      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 0 0  
91 - 364 Days | Non-U.S. governments      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 0 0  
91 - 364 Days | Corporate debt      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 0 0  
365 Days or Greater      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 0 0  
365 Days or Greater | Non-U.S. governments      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements 0 0  
365 Days or Greater | Corporate debt      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Securities pledged under repurchase agreements $ 0 $ 0