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Investments (Mortgage Loans - Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Contracts
Jun. 30, 2013
Contracts
Jun. 30, 2014
Contracts
Jun. 30, 2013
Contracts
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 2 0 4 0  
Financing Receivable, Significant Purchases $ 818,000,000 $ 836,000,000 $ 1,400,000,000 $ 886,000,000  
Percentage of Mortgage Loans Classified as Performing 99.00%   99.00%   99.00%
Agricultural [Member]
         
Financing Receivable, Recorded Investment [Line Items]          
Estimated fair value of mortgage loans held-for-investment 12,300,000,000   12,300,000,000   12,700,000,000
Residential [Member]
         
Financing Receivable, Recorded Investment [Line Items]          
Estimated fair value of mortgage loans held-for-investment $ 4,100,000,000   $ 4,100,000,000   $ 2,800,000,000
Commercial [Member]
         
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 0 0 0