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Investments (Credit Quality of Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 1,380  
Financing receivable, originated in FY before latest FY 2,970  
Financing receivable, originated two years before latest FY 2,691  
Financing receivable, originated three years before latest FY 1,421  
Financing receivable, originated four years before latest FY 1,733  
Financing receivable, originated five or more years before latest FY 5,621  
Financing receivable, before allowance for credit losses 15,816 $ 15,728
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 517  
Financing receivable, originated in FY before latest FY 1,977  
Financing receivable, originated two years before latest FY 1,515  
Financing receivable, originated three years before latest FY 880  
Financing receivable, originated four years before latest FY 1,250  
Financing receivable, originated five or more years before latest FY 3,548  
Financing receivable, before allowance for credit losses $ 9,687 $ 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 $ 9,423 $ 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 97.30% 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 $ 204 $ 298
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% 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 $ 60 $ 166
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 0.60% 1.70%
Commercial | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 317  
Financing receivable, originated in FY before latest FY 1,527  
Financing receivable, originated two years before latest FY 1,004  
Financing receivable, originated three years before latest FY 514  
Financing receivable, originated four years before latest FY 1,106  
Financing receivable, originated five or more years before latest FY 2,808  
Financing receivable, before allowance for credit losses 7,276  
Commercial | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 200  
Financing receivable, originated in FY before latest FY 450  
Financing receivable, originated two years before latest FY 482  
Financing receivable, originated three years before latest FY 322  
Financing receivable, originated four years before latest FY 59  
Financing receivable, originated five or more years before latest FY 498  
Financing receivable, before allowance for credit losses 2,011  
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 44  
Financing receivable, originated four years before latest FY 79  
Financing receivable, originated five or more years before latest FY 8  
Financing receivable, before allowance for credit losses 131  
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 29  
Financing receivable, originated three years before latest FY 0  
Financing receivable, originated four years before latest FY 6  
Financing receivable, originated five or more years before latest FY 234  
Financing receivable, before allowance for credit losses 269  
Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 647  
Financing receivable, originated in FY before latest FY 606  
Financing receivable, originated two years before latest FY 759  
Financing receivable, originated three years before latest FY 410  
Financing receivable, originated four years before latest FY 412  
Financing receivable, originated five or more years before latest FY 645  
Financing receivable, before allowance for credit losses 3,479 $ 3,326
Agricultural | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 566  
Financing receivable, originated in FY before latest FY 526  
Financing receivable, originated two years before latest FY 749  
Financing receivable, originated three years before latest FY 377  
Financing receivable, originated four years before latest FY 412  
Financing receivable, originated five or more years before latest FY 627  
Financing receivable, before allowance for credit losses 3,257  
Agricultural | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 81  
Financing receivable, originated in FY before latest FY 80  
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 222  
Residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 216  
Financing receivable, originated in FY before latest FY 387  
Financing receivable, originated two years before latest FY 417  
Financing receivable, originated three years before latest FY 131  
Financing receivable, originated four years before latest FY 71  
Financing receivable, originated five or more years before latest FY 1,428  
Financing receivable, before allowance for credit losses 2,650 $ 2,708
Residential | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 214  
Financing receivable, originated in FY before latest FY 381  
Financing receivable, originated two years before latest FY 413  
Financing receivable, originated three years before latest FY 131  
Financing receivable, originated four years before latest FY 70  
Financing receivable, originated five or more years before latest FY 1,375  
Financing receivable, before allowance for credit losses 2,584  
Residential | Nonperforming    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 2  
Financing receivable, originated in FY before latest FY 6  
Financing receivable, originated two years before latest FY 4  
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 53  
Financing receivable, before allowance for credit losses $ 66