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Investments (Credit Quality of Agricultural and Residential Mortgage Loans) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross $ 80,635 $ 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 $ 118 $ 140
Less than 65%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable Agricultural Mortgage Percentage 93.50% 92.00%
65% to 75%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable Agricultural Mortgage Percentage 5.80% 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 0.30% 0.10%
Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable Residential Mortgage Percentage 96.80% 96.20%
Nonperforming (1)    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable Residential Mortgage Percentage 3.20% 3.80%
Agricultural Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross $ 16,695 $ 14,905
Agricultural Mortgage Loans | Less than 65%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 15,618 13,704
Agricultural Mortgage Loans | 65% to 75%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 963 1,145
Agricultural Mortgage Loans | 76% to 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 71 33
Agricultural Mortgage Loans | Greater than 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 43 23
Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 14,316 12,427
Residential Mortgage Loans | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross 13,864 11,956
Residential Mortgage Loans | Nonperforming (1)    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross $ 452 $ 471