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Investments - Investments - Securities Lending, Repurchase Agreements, and Other Collateral Transactions (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Securities Lending Transactions:      
Required Collateral Held Under Securities Lending, Percentage   100.00%  
Securities Loaned   $ 0 $ 0
Reverse Repurchase Agreements, Other Collateral Transactions and Restricted Investments      
Securities for Reverse Repurchase Agreements   23 30
Assets Held by Insurance Regulators   2,500 2,600
Life and Annuity Insurance Product Line, Run-off Business      
Equity Method Investment, Realized Gain (Loss) on Disposal [Abstract]      
Proceeds from Sale of Equity Method Investments $ 217    
Equity Method Investment, Realized Gain (Loss) on Disposal $ 46 $ 46  
Domestic      
Securities Lending Transactions:      
Securities Loaned, Collateral, Percentage Required at Origination   102.00%  
Non-domestic      
Securities Lending Transactions:      
Securities Loaned, Collateral, Percentage Required at Origination   105.00%  
US Treasury Securities [Member]      
Reverse Repurchase Agreements, Other Collateral Transactions and Restricted Investments      
Debt Securities, Available-for-sale, Restricted   $ 9 34
Maximum      
Securities Lending Transactions:      
Securities Loaned, Term   90 days  
Fair Value Measured at Net Asset Value Per Share [Member]      
Reverse Repurchase Agreements, Other Collateral Transactions and Restricted Investments      
Deposit Assets   $ 62 54
Syndicate Policyholders [Member] | Debt Securities [Member]      
Reverse Repurchase Agreements, Other Collateral Transactions and Restricted Investments      
Debt Securities, Available-for-sale, Restricted   682 661
Syndicate Policyholders [Member] | Short-term investments      
Reverse Repurchase Agreements, Other Collateral Transactions and Restricted Investments      
Restricted Investments, Current   2 26
Lloyd's of London [Member] | Debt Securities [Member]      
Reverse Repurchase Agreements, Other Collateral Transactions and Restricted Investments      
Debt Securities, Available-for-sale, Restricted   $ 170 $ 175