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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]    
Document Period End Date Jun. 30, 2020  
Mortgage Loans:    
Total mortgage loans $ 6,040 $ 5,727
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract]    
Mortgage loans on real estate (net of valuation allowances) 5,974 5,706
Commercial Real Estate Portfolio Segment [Member]    
Mortgage Loans:    
Evaluated individually for credit losses 17 17
Evaluated collectively for credit losses 6,023 5,710
Total mortgage loans 6,040 5,727
Valuation Allowances:    
Specific for credit losses 0 0
Non-specifically identified credit losses 56 12
Total valuation allowances $ 56 $ 12