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Investments - Changes in Allowance for Expected Credit Losses on Mortgage Loans (Details) - USD ($)
$ in Millions
 7 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   $ 31 $ 39
Provision for loan losses $ 32 11 (8)
For initial credit losses on purchased loans accounted for as PCD financial assets 7    
Ending Balance 39 42 31
Residential Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   25 37
Provision for loan losses 30 7 (12)
For initial credit losses on purchased loans accounted for as PCD financial assets 7    
Ending Balance 37 32 25
Commercial Mortgage      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   6 2
Provision for loan losses 2 4 4
For initial credit losses on purchased loans accounted for as PCD financial assets 0    
Ending Balance $ 2 $ 10 $ 6