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Investments (Mortgage Loans - Narrative) (Details) - Mortgage Loans - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable, Past Due [Line Items]          
Significant Purchases $ 159 $ 816 $ 722 $ 1,400  
Performing          
Financing Receivable, Past Due [Line Items]          
Recorded Investment as a % of Total 99.00%   99.00%   99.00%
Commercial          
Financing Receivable, Past Due [Line Items]          
Estimated Fair Value of Recorded Investment $ 9,958   $ 9,958   $ 8,584
Recorded Investment of Loans Past Due 0   0   0
Recorded Investment of Loans in Nonaccrual Status 0   0   0
Agricultural          
Financing Receivable, Past Due [Line Items]          
Estimated Fair Value of Recorded Investment 3,300   3,300   2,900
Recorded Investment of Loans Past Due 7   7    
Recorded Investment of Loans in Nonaccrual Status 0   0   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 $ 2,700   $ 2,700   $ 2,300
Recorded Investment as a % of Total 100.00%   100.00%   100.00%
Recorded Investment of Loans Past Due $ 38   $ 38   $ 36
Recorded Investment of Loans in Nonaccrual Status $ 38   $ 38   $ 36
Residential | Performing          
Financing Receivable, Past Due [Line Items]          
Recorded Investment as a % of Total 98.60%   98.60%   98.40%