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Investments (Credit Quality of Agricultural and Residential Mortgage Loans) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross $ 78,092 $ 75,795
Loans Receivable Agricultural Mortgage Percentage 100.00% 100.00%
Loans Receivable Residential Mortgage Percentage 100.00% 100.00%
Mortgage Loans in Process of Foreclosure, Amount $ 124 $ 140
Less than 65%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable Agricultural Mortgage Percentage 92.90% 92.00%
65% to 75%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable Agricultural Mortgage Percentage 6.50% 7.70%
76% to 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable Agricultural Mortgage Percentage 0.40% 0.20%
Greater than 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable Agricultural Mortgage Percentage 0.20% 0.10%
Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable Residential Mortgage Percentage 96.70% 96.20%
Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable Residential Mortgage Percentage 3.30% 3.80%
Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross $ 13,188 $ 12,427
Residential Mortgage Loans | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 12,755 11,956
Residential Mortgage Loans | Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 433 471
Agricultural Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 15,334 14,905
Agricultural Mortgage Loans | Less than 65%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 14,250 13,704
Agricultural Mortgage Loans | 65% to 75%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 992 1,145
Agricultural Mortgage Loans | 76% to 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 69 33
Agricultural Mortgage Loans | Greater than 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross $ 23 $ 23