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Investments (Mortgage Loans - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Significant Purchases $ 785 $ 818 $ 2,200 $ 1,400  
Percentage of Mortgage Loans Classified as Performing 99.00%   99.00%   99.00%
Commercial          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Average Recorded Investment $ 160 462 $ 165 476  
Agricultural          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Average Recorded Investment 64 88 63 92  
Estimated fair value of mortgage loans held-for-investment 12,900   12,900   $ 12,800
Residential          
Financing Receivable, Recorded Investment [Line Items]          
Impaired Financing Receivable, Average Recorded Investment 70 $ 9 59 $ 12  
Estimated fair value of mortgage loans held-for-investment $ 8,600   $ 8,600   $ 6,600