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Investments (Mortgage Loans - Narrative) (Details) - Mortgage Loans - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Significant Purchases $ 86 $ 518 $ 563 $ 604  
Performing          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Recorded Investment as a % of Total 99.00%   99.00%   99.00%
Commercial          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Estimated Fair Value of Recorded Investment $ 9,650   $ 9,650   $ 8,584
Recorded Investment of Loans Past Due 0   0   0
Recorded Investment of Loans in Nonaccrual Status 0   0   0
Agricultural          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Estimated Fair Value of Recorded Investment 3,300   3,300   2,900
Recorded Investment of Loans Past Due 6   6    
Recorded Investment of Loans in Nonaccrual Status 0   0   0
Agricultural | Maximum          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Recorded Investment of Loans Past Due         1
Residential          
Financing Receivable, Recorded Investment, 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 $ 37   $ 37   $ 36
Recorded Investment of Loans in Nonaccrual Status $ 37   $ 37   $ 36
Residential | Performing          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Recorded Investment as a % of Total 98.60%   98.60%   98.40%