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Investments (Age Analysis of Past Due Recorded Investments) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Past Due [Line Items]      
Document Period End Date Sep. 30, 2020    
Financing Receivable, Past Due $ 20   $ 0
Financing Receivable, Not Past Due     5,727
Loans Receivable, Gross, Commercial, Real Estate 5,981   5,727
Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment 64 $ 5,961 12
Loans Receivable, Gross, Commercial, Real Estate 5,981   5,727
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, Past Due 20   0
Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, Past Due     0
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, Past Due   $ 0  
Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Financing Receivable, Past Due $ 0   $ 0