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Commitments and Contingencies (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Statutory Accounting Practices [Line Items]    
Performance bond $ 35  
Net assets of subsidiaries subject to restrictions 3,700  
Aggregate statutory capital and surplus 4,100  
Required minimum statutory capital surplus 2,300  
Parent Company    
Statutory Accounting Practices [Line Items]    
Cash, cash equivalents, and investments $ 742 $ 375