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Investments (Credit Quality of Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 115  
Financing receivable, originated in FY before latest FY 3,115  
Financing receivable, originated two years before latest FY 3,088  
Financing receivable, originated three years before latest FY 1,552  
Financing receivable, originated four years before latest FY 1,789  
Financing receivable, originated five or more years before latest FY 5,866  
Financing receivable, before allowance for credit losses 15,525 $ 15,728
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0  
Financing receivable, originated in FY before latest FY 1,990  
Financing receivable, originated two years before latest FY 1,609  
Financing receivable, originated three years before latest FY 923  
Financing receivable, originated four years before latest FY 1,253  
Financing receivable, originated five or more years before latest FY 3,709  
Financing receivable, before allowance for credit losses $ 9,484 $ 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 $ 9,114 $ 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 96.10% 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 $ 298 $ 298
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 3.10% 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 $ 72 $ 166
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 0.80% 1.70%
Commercial | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 0  
Financing receivable, originated in FY before latest FY 1,829  
Financing receivable, originated two years before latest FY 1,409  
Financing receivable, originated three years before latest FY 716  
Financing receivable, originated four years before latest FY 1,123  
Financing receivable, originated five or more years before latest FY 3,425  
Financing receivable, before allowance for credit losses 8,502  
Commercial | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0  
Financing receivable, originated in FY before latest FY 161  
Financing receivable, originated two years before latest FY 200  
Financing receivable, originated three years before latest FY 195  
Financing receivable, originated four years before latest FY 100  
Financing receivable, originated five or more years before latest FY 143  
Financing receivable, before allowance for credit losses 799  
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 12  
Financing receivable, originated four years before latest FY 30  
Financing receivable, originated five or more years before latest FY 141  
Financing receivable, before allowance for credit losses 183  
Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 65  
Financing receivable, originated in FY before latest FY 649  
Financing receivable, originated two years before latest FY 841  
Financing receivable, originated three years before latest FY 485  
Financing receivable, originated four years before latest FY 490  
Financing receivable, originated five or more years before latest FY 810  
Financing receivable, before allowance for credit losses 3,340 $ 3,326
Agricultural | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 63  
Financing receivable, originated in FY before latest FY 563  
Financing receivable, originated two years before latest FY 815  
Financing receivable, originated three years before latest FY 424  
Financing receivable, originated four years before latest FY 454  
Financing receivable, originated five or more years before latest FY 803  
Financing receivable, before allowance for credit losses 3,122  
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 86  
Financing receivable, originated two years before latest FY 15  
Financing receivable, originated three years before latest FY 61  
Financing receivable, originated four years before latest FY 36  
Financing receivable, originated five or more years before latest FY 7  
Financing receivable, before allowance for credit losses 207  
Agricultural | 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 11  
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 11  
Residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 50  
Financing receivable, originated in FY before latest FY 476  
Financing receivable, originated two years before latest FY 638  
Financing receivable, originated three years before latest FY 144  
Financing receivable, originated four years before latest FY 46  
Financing receivable, originated five or more years before latest FY 1,347  
Financing receivable, before allowance for credit losses 2,701 $ 2,708
Residential | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 50  
Financing receivable, originated in FY before latest FY 476  
Financing receivable, originated two years before latest FY 637  
Financing receivable, originated three years before latest FY 144  
Financing receivable, originated four years before latest FY 45  
Financing receivable, originated five or more years before latest FY 1,309  
Financing receivable, before allowance for credit losses 2,661  
Residential | Nonperforming    
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 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 38  
Financing receivable, before allowance for credit losses $ 40