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Investments (Credit Quality of Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 537  
Financing receivable, originated in FY before latest FY 3,132  
Financing receivable, originated two years before latest FY 2,910  
Financing receivable, originated three years before latest FY 1,531  
Financing receivable, originated four years before latest FY 1,791  
Financing receivable, originated five or more years before latest FY 5,894  
Financing receivable, before allowance for credit losses 15,795 $ 15,728
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 252  
Financing receivable, originated in FY before latest FY 1,989  
Financing receivable, originated two years before latest FY 1,575  
Financing receivable, originated three years before latest FY 923  
Financing receivable, originated four years before latest FY 1,252  
Financing receivable, originated five or more years before latest FY 3,697  
Financing receivable, before allowance for credit losses $ 9,688 $ 9,694
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 100.00% 100.00%
Commercial | Debt Service Coverage Ratio, Greater than 1.20x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, before allowance for credit losses $ 9,171 $ 9,230
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 94.70% 95.20%
Commercial | Debt Service Coverage Ratio, 1.00x to 1.20x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, before allowance for credit losses $ 314 $ 298
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 3.20% 3.10%
Commercial | Debt Service Coverage Ratio, Less than 1.00x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, before allowance for credit losses $ 203 $ 166
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 2.10% 1.70%
Commercial | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 193  
Financing receivable, originated in FY before latest FY 1,683  
Financing receivable, originated two years before latest FY 1,109  
Financing receivable, originated three years before latest FY 571  
Financing receivable, originated four years before latest FY 1,122  
Financing receivable, originated five or more years before latest FY 3,224  
Financing receivable, before allowance for credit losses 7,902  
Commercial | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 59  
Financing receivable, originated in FY before latest FY 306  
Financing receivable, originated two years before latest FY 456  
Financing receivable, originated three years before latest FY 340  
Financing receivable, originated four years before latest FY 10  
Financing receivable, originated five or more years before latest FY 275  
Financing receivable, before allowance for credit losses 1,446  
Commercial | Loan-to-Value Ratio, 76% to 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0  
Financing receivable, originated in FY before latest FY 0  
Financing receivable, originated two years before latest FY 0  
Financing receivable, originated three years before latest FY 0  
Financing receivable, originated four years before latest FY 114  
Financing receivable, originated five or more years before latest FY 0  
Financing receivable, before allowance for credit losses 114  
Commercial | Loan-to-Value Ratio, Greater than 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0  
Financing receivable, originated in FY before latest FY 0  
Financing receivable, originated two years before latest FY 10  
Financing receivable, originated three years before latest FY 12  
Financing receivable, originated four years before latest FY 6  
Financing receivable, originated five or more years before latest FY 198  
Financing receivable, before allowance for credit losses 226  
Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 117  
Financing receivable, originated in FY before latest FY 645  
Financing receivable, originated two years before latest FY 794  
Financing receivable, originated three years before latest FY 476  
Financing receivable, originated four years before latest FY 487  
Financing receivable, originated five or more years before latest FY 781  
Financing receivable, before allowance for credit losses 3,300 $ 3,326
Agricultural | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 107  
Financing receivable, originated in FY before latest FY 564  
Financing receivable, originated two years before latest FY 784  
Financing receivable, originated three years before latest FY 431  
Financing receivable, originated four years before latest FY 487  
Financing receivable, originated five or more years before latest FY 763  
Financing receivable, before allowance for credit losses 3,136  
Agricultural | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 2  
Financing receivable, originated in FY before latest FY 76  
Financing receivable, originated two years before latest FY 10  
Financing receivable, originated three years before latest FY 45  
Financing receivable, originated four years before latest FY 0  
Financing receivable, originated five or more years before latest FY 18  
Financing receivable, before allowance for credit losses 151  
Agricultural | Loan-to-Value Ratio, 76% to 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 8  
Financing receivable, originated in FY before latest FY 5  
Financing receivable, originated two years before latest FY 0  
Financing receivable, originated three years before latest FY 0  
Financing receivable, originated four years before latest FY 0  
Financing receivable, originated five or more years before latest FY 0  
Financing receivable, before allowance for credit losses 13  
Residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 168  
Financing receivable, originated in FY before latest FY 498  
Financing receivable, originated two years before latest FY 541  
Financing receivable, originated three years before latest FY 132  
Financing receivable, originated four years before latest FY 52  
Financing receivable, originated five or more years before latest FY 1,416  
Financing receivable, before allowance for credit losses 2,807 $ 2,708
Residential | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 168  
Financing receivable, originated in FY before latest FY 497  
Financing receivable, originated two years before latest FY 540  
Financing receivable, originated three years before latest FY 132  
Financing receivable, originated four years before latest FY 51  
Financing receivable, originated five or more years before latest FY 1,371  
Financing receivable, before allowance for credit losses 2,759  
Residential | Nonperforming    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0  
Financing receivable, originated in FY before latest FY 1  
Financing receivable, originated two years before latest FY 1  
Financing receivable, originated three years before latest FY 0  
Financing receivable, originated four years before latest FY 1  
Financing receivable, originated five or more years before latest FY 45  
Financing receivable, before allowance for credit losses $ 48