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Investments (Credit Quality of Agricultural and Residential Mortgage Loans) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross $ 78,675 $ 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 $ 140 $ 140
Less than 65%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable Agricultural Mortgage Percentage 93.10% 92.00%
65% to 75%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable Agricultural Mortgage Percentage 6.70% 7.70%
76% to 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable Agricultural Mortgage Percentage 0.00% 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 96.40% 96.20%
Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable Residential Mortgage Percentage 3.60% 3.80%
Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross $ 13,585 $ 12,427
Residential Mortgage Loans | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 13,102 11,956
Residential Mortgage Loans | Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 483 471
Agricultural Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 15,130 14,905
Agricultural Mortgage Loans | Less than 65%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 14,091 13,704
Agricultural Mortgage Loans | 65% to 75%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 1,018 1,145
Agricultural Mortgage Loans | 76% to 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 0 33
Agricultural Mortgage Loans | Greater than 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross $ 21 $ 23