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Investments - Nonaccrual Status (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2020
Residential Mortgage [Member]      
Financing Receivable, Nonaccrual [Line Items]      
Financing Receivable, Nonaccrual $ 134 $ 360 $ 107
Financing Receivable, Nonaccrual, No Allowance 76    
Financing Receivable, Nonaccrual, Interest Income 8    
Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Nonaccrual [Line Items]      
Financing Receivable, Nonaccrual 62 $ 19 $ 38
Financing Receivable, Nonaccrual, No Allowance 0    
Financing Receivable, Nonaccrual, Interest Income $ 0