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Investments - Pledged investments (Details) - USD ($)
Sep. 30, 2022
Dec. 31, 2021
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Fixed maturity securities available for sale $ 321,000,000 $ 3,583,000,000
Amounts borrowed under repurchase and securities lending agreements 408,000,000 3,700,000,000
Securities pledged under repurchase agreements 321,000,000 259,000,000
Securities pledged under securities lending agreements 0 3,324,000,000
Securities collateral pledged to us 265,000,000 1,839,000,000
Carrying value of reverse repurchase agreements 270,000,000 1,900,000,000
Total carrying values of cash and securities deposited under requirements of regulatory authorities or other insurance-related arrangements 11,400,000,000 13,500,000,000
Loans 48,779,000,000 46,677,000,000
Bonds available for sale and short-term investments held in escrow 594,000,000 514,000,000
Asset Pledged as Collateral    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Fixed maturity securities available for sale 5,500,000,000 5,100,000,000
Other bond securities, at fair value 1,500,000,000 1,400,000,000
Loans 1,800,000,000 1,500,000,000
Overnight and Continuous    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 203,000,000 176,000,000
Securities pledged under securities lending agreements 0 0
up to 30 days    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 26,000,000 61,000,000
Securities pledged under securities lending agreements 0 534,000,000
31 - 90 days    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 50,000,000 22,000,000
Securities pledged under securities lending agreements 0 2,790,000,000
91 - 364 days    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 42,000,000 0
Securities pledged under securities lending agreements 0 0
365 days or greater    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 0 0
Securities pledged under securities lending agreements 0 0
Bonds available for sale | U.S. government and government sponsored entities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 90,000,000  
Bonds available for sale | Non-U.S. governments    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 56,000,000 48,000,000
Securities pledged under securities lending agreements 0 43,000,000
Bonds available for sale | Corporate debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 175,000,000 211,000,000
Securities pledged under securities lending agreements   3,175,000,000
Bonds available for sale | Obligations of states, municipalities and political subdivisions    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under securities lending agreements 0 106,000,000
Bonds available for sale | Overnight and Continuous | U.S. government and government sponsored entities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 0  
Bonds available for sale | Overnight and Continuous | Non-U.S. governments    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 28,000,000 48,000,000
Securities pledged under securities lending agreements 0 0
Bonds available for sale | Overnight and Continuous | Corporate debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 175,000,000 128,000,000
Securities pledged under securities lending agreements   0
Bonds available for sale | Overnight and Continuous | Obligations of states, municipalities and political subdivisions    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under securities lending agreements 0 0
Bonds available for sale | up to 30 days | U.S. government and government sponsored entities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 26,000,000  
Bonds available for sale | up to 30 days | Non-U.S. governments    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 0 0
Securities pledged under securities lending agreements 0 0
Bonds available for sale | up to 30 days | Corporate debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 0 61,000,000
Securities pledged under securities lending agreements   534,000,000
Bonds available for sale | up to 30 days | Obligations of states, municipalities and political subdivisions    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under securities lending agreements 0 0
Bonds available for sale | 31 - 90 days | U.S. government and government sponsored entities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 50,000,000  
Bonds available for sale | 31 - 90 days | Non-U.S. governments    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 0 0
Securities pledged under securities lending agreements 0 43,000,000
Bonds available for sale | 31 - 90 days | Corporate debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 0 22,000,000
Securities pledged under securities lending agreements   2,641,000,000
Bonds available for sale | 31 - 90 days | Obligations of states, municipalities and political subdivisions    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under securities lending agreements 0 106,000,000
Bonds available for sale | 91 - 364 days | U.S. government and government sponsored entities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 14,000,000  
Bonds available for sale | 91 - 364 days | Non-U.S. governments    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 28,000,000 0
Securities pledged under securities lending agreements 0 0
Bonds available for sale | 91 - 364 days | Corporate debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 0 0
Securities pledged under securities lending agreements   0
Bonds available for sale | 91 - 364 days | Obligations of states, municipalities and political subdivisions    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under securities lending agreements 0 0
Bonds available for sale | 365 days or greater | U.S. government and government sponsored entities    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 0  
Bonds available for sale | 365 days or greater | Non-U.S. governments    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 0 0
Securities pledged under securities lending agreements 0 0
Bonds available for sale | 365 days or greater | Corporate debt    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under repurchase agreements 0 0
Securities pledged under securities lending agreements   0
Bonds available for sale | 365 days or greater | Obligations of states, municipalities and political subdivisions    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities pledged under securities lending agreements 0 0
FHLBs    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Federal Home Loan Bank stock $ 239,000,000 $ 211,000,000