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Investments - Pledged Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Fixed maturity securities available for sale $ 3,651 $ 2,723
Amounts borrowed under repurchase and securities lending agreements 3,600 2,600
Securities pledged under repurchase agreements 3,651 2,723
Securities collateral pledged to us 934 1,200
Carrying value of reverse repurchase agreements 927 1,100
Total carrying values of cash and securities deposited under requirements of regulatory authorities or other insurance-related arrangements 18,500 16,500
Federal Home Loan Bank stock 288 283
Bonds available for sale and short-term investments held in escrow 164 164
Asset Pledged as Collateral    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Fixed maturity securities available for sale 6,200 6,500
Loans 3,100 3,000
Other bond securities, at fair value 77 63
Non-U.S. governments    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 51 277
Corporate debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 3,600 2,446
Overnight and Continuous    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 14 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 14 38
up to 30 days    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 3,637 2,685
up to 30 days | Non-U.S. governments    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 51 277
up to 30 days | Corporate debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 3,586 2,408
31 - 90 days    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 0 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 0 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