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Investments (Mortgage Loans - Narrative) (Details) - Mortgage Loans - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Past Due [Line Items]    
Significant Purchases $ 962 $ 1,900
Performing    
Financing Receivable, Past Due [Line Items]    
Recorded Investment as a % of Total 99.00% 99.00%
Commercial    
Financing Receivable, Past Due [Line Items]    
Estimated Fair Value of Recorded Investment $ 10,159 $ 8,611
Recorded Investment of Loans Past Due 0 0
Recorded Investment of Loans in Nonaccrual Status 0 0
Agricultural    
Financing Receivable, Past Due [Line Items]    
Estimated Fair Value of Recorded Investment 3,500 2,900
Recorded Investment of Loans Past Due 21  
Recorded Investment of Loans in Nonaccrual Status 21 0
Agricultural | Maximum    
Financing Receivable, Past Due [Line Items]    
Recorded Investment of Loans Past Due   1
Residential    
Financing Receivable, Past Due [Line Items]    
Estimated Fair Value of Recorded Investment $ 2,800 $ 2,300
Recorded Investment as a % of Total 100.00% 100.00%
Recorded Investment of Loans Past Due $ 37 $ 36
Recorded Investment of Loans in Nonaccrual Status $ 37 $ 36
Residential | Performing    
Financing Receivable, Past Due [Line Items]    
Recorded Investment as a % of Total 98.60% 98.40%