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Investments (Credit Quality of Agricultural and Residential Mortgage Loans) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross $ 81,628 $ 80,635
Mortgage Loans in Process of Foreclosure, Amount 119 118
Agricultural Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Originated in Current Fiscal Year 561  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 2,611  
Financing Receivable, Originated Two Years before Latest Fiscal Year 3,255  
Financing Receivable, Originated Three Years before Latest Fiscal Year 1,213  
Financing Receivable, Originated Four Years before Latest Fiscal Year 2,925  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 5,357  
Financing Receivable, Revolving 866  
Mortgage Loans, Gross $ 16,788 16,695
Loans Receivable Agricultural Mortgage Percentage 100.00%  
Agricultural Mortgage Loans | Less than 65%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Originated in Current Fiscal Year $ 522  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 2,419  
Financing Receivable, Originated Two Years before Latest Fiscal Year 3,131  
Financing Receivable, Originated Three Years before Latest Fiscal Year 1,118  
Financing Receivable, Originated Four Years before Latest Fiscal Year 2,898  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 5,068  
Financing Receivable, Revolving 853  
Mortgage Loans, Gross $ 16,009  
Loans Receivable Agricultural Mortgage Percentage 95.40%  
Agricultural Mortgage Loans | 65% to 75%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Originated in Current Fiscal Year $ 39  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 192  
Financing Receivable, Originated Two Years before Latest Fiscal Year 113  
Financing Receivable, Originated Three Years before Latest Fiscal Year 95  
Financing Receivable, Originated Four Years before Latest Fiscal Year 27  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 241  
Financing Receivable, Revolving 11  
Mortgage Loans, Gross $ 718  
Loans Receivable Agricultural Mortgage Percentage 4.30%  
Agricultural Mortgage Loans | 76% to 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Originated in Current Fiscal Year $ 0  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 0  
Financing Receivable, Originated Two Years before Latest Fiscal Year 11  
Financing Receivable, Originated Three Years before Latest Fiscal Year 0  
Financing Receivable, Originated Four Years before Latest Fiscal Year 0  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 6  
Financing Receivable, Revolving 2  
Mortgage Loans, Gross $ 19  
Loans Receivable Agricultural Mortgage Percentage 0.10%  
Agricultural Mortgage Loans | Greater than 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Originated in Current Fiscal Year $ 0  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 0  
Financing Receivable, Originated Two Years before Latest Fiscal Year 0  
Financing Receivable, Originated Three Years before Latest Fiscal Year 0  
Financing Receivable, Originated Four Years before Latest Fiscal Year 0  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 42  
Financing Receivable, Revolving 0  
Mortgage Loans, Gross $ 42  
Loans Receivable Agricultural Mortgage Percentage 0.20%  
Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Originated in Current Fiscal Year $ 249  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 3,093  
Financing Receivable, Originated Two Years before Latest Fiscal Year 1,488  
Financing Receivable, Originated Three Years before Latest Fiscal Year 515  
Financing Receivable, Originated Four Years before Latest Fiscal Year 275  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 9,143  
Financing Receivable, Revolving 0  
Mortgage Loans, Gross $ 14,763 $ 14,316
Loans Receivable Residential Mortgage Percentage 100.00%  
Residential Mortgage Loans | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Originated in Current Fiscal Year $ 249  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 3,084  
Financing Receivable, Originated Two Years before Latest Fiscal Year 1,479  
Financing Receivable, Originated Three Years before Latest Fiscal Year 510  
Financing Receivable, Originated Four Years before Latest Fiscal Year 268  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 8,766  
Financing Receivable, Revolving 0  
Mortgage Loans, Gross $ 14,356  
Loans Receivable Residential Mortgage Percentage 97.20%  
Residential Mortgage Loans | Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Originated in Current Fiscal Year $ 0  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 9  
Financing Receivable, Originated Two Years before Latest Fiscal Year 9  
Financing Receivable, Originated Three Years before Latest Fiscal Year 5  
Financing Receivable, Originated Four Years before Latest Fiscal Year 7  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 377  
Financing Receivable, Revolving 0  
Mortgage Loans, Gross $ 407  
Loans Receivable Residential Mortgage Percentage 2.80%