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Investments (Credit Quality of Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 840  
Financing receivable, originated in FY before latest FY 3,060  
Financing receivable, originated two years before latest FY 2,822  
Financing receivable, originated three years before latest FY 1,496  
Financing receivable, originated four years before latest FY 1,775  
Financing receivable, originated five or more years before latest FY 5,756  
Financing receivable, before allowance for credit losses 15,749 $ 15,728
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 402  
Financing receivable, originated in FY before latest FY 1,990  
Financing receivable, originated two years before latest FY 1,576  
Financing receivable, originated three years before latest FY 923  
Financing receivable, originated four years before latest FY 1,251  
Financing receivable, originated five or more years before latest FY 3,661  
Financing receivable, before allowance for credit losses $ 9,803 $ 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 $ 9,259 $ 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 94.40% 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 $ 359 $ 298
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 3.70% 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 $ 185 $ 166
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 1.90% 1.70%
Commercial | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 288  
Financing receivable, originated in FY before latest FY 1,645  
Financing receivable, originated two years before latest FY 1,113  
Financing receivable, originated three years before latest FY 571  
Financing receivable, originated four years before latest FY 1,121  
Financing receivable, originated five or more years before latest FY 3,187  
Financing receivable, before allowance for credit losses 7,925  
Commercial | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 114  
Financing receivable, originated in FY before latest FY 345  
Financing receivable, originated two years before latest FY 453  
Financing receivable, originated three years before latest FY 340  
Financing receivable, originated four years before latest FY 40  
Financing receivable, originated five or more years before latest FY 277  
Financing receivable, before allowance for credit losses 1,569  
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 84  
Financing receivable, originated five or more years before latest FY 0  
Financing receivable, before allowance for credit losses 84  
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 197  
Financing receivable, before allowance for credit losses 225  
Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 237  
Financing receivable, originated in FY before latest FY 637  
Financing receivable, originated two years before latest FY 763  
Financing receivable, originated three years before latest FY 456  
Financing receivable, originated four years before latest FY 481  
Financing receivable, originated five or more years before latest FY 746  
Financing receivable, before allowance for credit losses 3,320 $ 3,326
Agricultural | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 200  
Financing receivable, originated in FY before latest FY 556  
Financing receivable, originated two years before latest FY 753  
Financing receivable, originated three years before latest FY 423  
Financing receivable, originated four years before latest FY 481  
Financing receivable, originated five or more years before latest FY 728  
Financing receivable, before allowance for credit losses 3,141  
Agricultural | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 37  
Financing receivable, originated in FY before latest FY 81  
Financing receivable, originated two years before latest FY 10  
Financing receivable, originated three years before latest FY 33  
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 179  
Residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 201  
Financing receivable, originated in FY before latest FY 433  
Financing receivable, originated two years before latest FY 483  
Financing receivable, originated three years before latest FY 117  
Financing receivable, originated four years before latest FY 43  
Financing receivable, originated five or more years before latest FY 1,349  
Financing receivable, before allowance for credit losses 2,626 $ 2,708
Residential | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 200  
Financing receivable, originated in FY before latest FY 428  
Financing receivable, originated two years before latest FY 478  
Financing receivable, originated three years before latest FY 116  
Financing receivable, originated four years before latest FY 43  
Financing receivable, originated five or more years before latest FY 1,261  
Financing receivable, before allowance for credit losses 2,526  
Residential | Nonperforming    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 1  
Financing receivable, originated in FY before latest FY 5  
Financing receivable, originated two years before latest FY 5  
Financing receivable, originated three years before latest FY 1  
Financing receivable, originated four years before latest FY 0  
Financing receivable, originated five or more years before latest FY 88  
Financing receivable, before allowance for credit losses $ 100