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Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]    
Document Period End Date Jun. 30, 2021  
Mortgage Loans:    
Total mortgage loans $ 6,537 $ 5,861
Mortgage Loans on Real Estate, Commercial and Consumer, Net, (Investment Based Operations Presentation) [Abstract]    
Mortgage loans on real estate (net of valuation allowances) 6,481 5,787
Commercial Real Estate Portfolio Segment [Member]    
Mortgage Loans:    
Evaluated individually for credit losses 36 37
Evaluated collectively for credit losses 6,501 5,824
Total mortgage loans 6,537 5,861
Valuation Allowances:    
Specific for credit losses 0 0
Non-specifically identified credit losses 45 64
Total valuation allowances $ 45 $ 64