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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mortgage Loans [Abstract]        
Financing Receivable, Individually Evaluated for Impairment $ 37 $ 17    
Financing Receivable, Collectively Evaluated for Impairment 5,824 5,710    
Loans Receivable, Gross, Commercial, Real Estate 5,861 5,727    
Valuation Allowances [Abstract]        
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 0 0    
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 64 12    
Allowance for Loan and Lease Losses, Real Estate $ 64 $ 12 $ 11 $ 9