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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]        
Document Period End Date Mar. 31, 2020      
Recorded investment $ 6,063 $ 5,727    
Valuation Allowances:        
Allowance for Loan and Lease Losses, Real Estate 39 12 $ 11 $ 11
Commercial Real Estate Portfolio Segment [Member]        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Evaluated individually for credit losses 17 17    
Evaluated collectively for credit losses 6,046 5,710    
Recorded investment 6,063 5,727    
Valuation Allowances:        
Specific for credit losses 0 0    
Non-specifically identified credit losses 39 12    
Allowance for Loan and Lease Losses, Real Estate $ 39 $ 12