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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Investment Management Service Agreement | Sixth Street        
Effects of Reinsurance [Line Items]        
Related party transaction amount   $ 0 $ 2 $ 1
Investments Issued | Sixth Street        
Effects of Reinsurance [Line Items]        
Related party transaction amount       12
Affiliated Entity | Intercompany Liquidity Agreements        
Effects of Reinsurance [Line Items]        
Outstanding borrowings     0 0
Payment for intercompany liquidity agreement     440  
Proceeds for intercompany liquidity agreement     160  
Affiliated Entity | Intercompany Liquidity Agreements | Parent Company        
Effects of Reinsurance [Line Items]        
Maximum borrowing capacity       1,500
Maximum lending capacity per individual       500
Affiliated Entity | Intercompany Liquidity Agreements | Subsidiaries        
Effects of Reinsurance [Line Items]        
Maximum borrowing capacity       600
Maximum lending capacity per individual       200
Affiliated Entity | Investment Management Service Agreement        
Effects of Reinsurance [Line Items]        
Accounts payable     1 0
Affiliated Entity | Investments Issued | Sixth Street        
Effects of Reinsurance [Line Items]        
Related party transaction amount     87  
Accounts receivable     118 49
Limited Liability Company | Insurance Administration Services and Support        
Effects of Reinsurance [Line Items]        
Related party transaction amount $ 14   $ 52 $ 53