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Investments (Credit Quality of Agricultural and Residential Mortgage Loans) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Mortgage Loans, Gross $ 83,270 $ 80,635
Mortgage Loans in Process of Foreclosure, Amount 113 118
Agricultural Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year 1,349  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,577  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 3,234  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,177  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 2,865  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 5,001  
Financing Receivable, Revolving 964  
Mortgage Loans, Gross $ 17,167 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, Year One, Originated, Current Fiscal Year $ 1,283  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,418  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 3,148  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,131  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 2,688  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 4,395  
Financing Receivable, Revolving 964  
Mortgage Loans, Gross $ 16,027  
Loans Receivable Agricultural Mortgage Percentage 93.40%  
Agricultural Mortgage Loans | 65% to 75%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 66  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 159  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 86  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 46  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 177  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 552  
Financing Receivable, Revolving 0  
Mortgage Loans, Gross $ 1,086  
Loans Receivable Agricultural Mortgage Percentage 6.30%  
Agricultural Mortgage Loans | 76% to 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 12  
Financing Receivable, Revolving 0  
Mortgage Loans, Gross $ 12  
Loans Receivable Agricultural Mortgage Percentage 0.10%  
Agricultural Mortgage Loans | Greater than 80%    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0  
Financing Receivable, Originated, More than Five Years before Current 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, Year One, Originated, Current Fiscal Year $ 565  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 3,117  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,307  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 460  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 267  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 9,344  
Financing Receivable, Revolving 0  
Mortgage Loans, Gross $ 15,060 $ 14,316
Loans Receivable Residential Mortgage Percentage 100.00%  
Residential Mortgage Loans | Performing    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 562  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 3,106  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,293  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 449  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 257  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 8,996  
Financing Receivable, Revolving 0  
Mortgage Loans, Gross $ 14,663  
Loans Receivable Residential Mortgage Percentage 97.40%  
Residential Mortgage Loans | Nonperforming    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 3  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 11  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 14  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 11  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 10  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 348  
Financing Receivable, Revolving 0  
Mortgage Loans, Gross $ 397  
Loans Receivable Residential Mortgage Percentage 2.60%