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Investments (Credit Quality of Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 4,369 $ 5,793
Financing receivable, originated in FY before latest FY 6,197 1,347
Financing receivable, originated two years before latest FY 1,089 2,821
Financing receivable, originated three years before latest FY 2,648 2,384
Financing receivable, originated four years before latest FY 2,191 1,189
Financing receivable, originated five or more years before latest FY 6,502 6,376
Financing receivable, before allowance for credit losses 22,996 19,910
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 2,419 3,404
Financing receivable, originated in FY before latest FY 3,191 529
Financing receivable, originated two years before latest FY 445 1,977
Financing receivable, originated three years before latest FY 1,879 1,451
Financing receivable, originated four years before latest FY 1,377 739
Financing receivable, originated five or more years before latest FY 4,236 4,059
Financing receivable, before allowance for credit losses $ 13,547 $ 12,159
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 $ 12,132 $ 10,263
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 89.60% 84.40%
Commercial | Debt Service Coverage Ratio, 1.00x to 1.20x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, before allowance for credit losses $ 589 $ 595
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 4.30% 4.90%
Commercial | Debt Service Coverage Ratio, Less than 1.00x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, before allowance for credit losses $ 826 $ 1,301
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 6.10% 10.70%
Commercial | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 1,916 $ 2,771
Financing receivable, originated in FY before latest FY 2,819 437
Financing receivable, originated two years before latest FY 405 1,539
Financing receivable, originated three years before latest FY 1,493 986
Financing receivable, originated four years before latest FY 888 553
Financing receivable, originated five or more years before latest FY 3,624 3,300
Financing receivable, before allowance for credit losses 11,145 9,586
Commercial | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 503 633
Financing receivable, originated in FY before latest FY 354 92
Financing receivable, originated two years before latest FY 0 383
Financing receivable, originated three years before latest FY 271 406
Financing receivable, originated four years before latest FY 367 127
Financing receivable, originated five or more years before latest FY 402 458
Financing receivable, before allowance for credit losses 1,897 2,099
Commercial | Loan-to-Value Ratio, 76% to 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0 0
Financing receivable, originated in FY before latest FY 18 0
Financing receivable, originated two years before latest FY 40 55
Financing receivable, originated three years before latest FY 90 29
Financing receivable, originated four years before latest FY 65 59
Financing receivable, originated five or more years before latest FY 48 31
Financing receivable, before allowance for credit losses 261 174
Commercial | Loan-to-Value Ratio, Greater than 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0 0
Financing receivable, originated in FY before latest FY 0 0
Financing receivable, originated two years before latest FY 0 0
Financing receivable, originated three years before latest FY 25 30
Financing receivable, originated four years before latest FY 57 0
Financing receivable, originated five or more years before latest FY 162 270
Financing receivable, before allowance for credit losses 244 300
Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 680 1,264
Financing receivable, originated in FY before latest FY 1,253 616
Financing receivable, originated two years before latest FY 477 571
Financing receivable, originated three years before latest FY 552 700
Financing receivable, originated four years before latest FY 645 317
Financing receivable, originated five or more years before latest FY 726 660
Financing receivable, before allowance for credit losses 4,333 4,128
Agricultural | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 532 1,150
Financing receivable, originated in FY before latest FY 1,163 539
Financing receivable, originated two years before latest FY 418 510
Financing receivable, originated three years before latest FY 496 674
Financing receivable, originated four years before latest FY 643 284
Financing receivable, originated five or more years before latest FY 710 608
Financing receivable, before allowance for credit losses 3,962 3,765
Agricultural | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 148 114
Financing receivable, originated in FY before latest FY 90 77
Financing receivable, originated two years before latest FY 59 61
Financing receivable, originated three years before latest FY 56 26
Financing receivable, originated four years before latest FY 1 33
Financing receivable, originated five or more years before latest FY 16 52
Financing receivable, before allowance for credit losses 370 363
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 0  
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 0  
Financing receivable, before allowance for credit losses 1  
Residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 1,270 1,125
Financing receivable, originated in FY before latest FY 1,753 202
Financing receivable, originated two years before latest FY 167 273
Financing receivable, originated three years before latest FY 217 233
Financing receivable, originated four years before latest FY 169 133
Financing receivable, originated five or more years before latest FY 1,540 1,657
Financing receivable, before allowance for credit losses 5,116 3,623
Residential | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 1,266 1,124
Financing receivable, originated in FY before latest FY 1,745 202
Financing receivable, originated two years before latest FY 167 270
Financing receivable, originated three years before latest FY 215 230
Financing receivable, originated four years before latest FY 168 132
Financing receivable, originated five or more years before latest FY 1,491 1,606
Financing receivable, before allowance for credit losses 5,052 3,564
Residential | Nonperforming    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 4 1
Financing receivable, originated in FY before latest FY 8 0
Financing receivable, originated two years before latest FY 0 3
Financing receivable, originated three years before latest FY 2 3
Financing receivable, originated four years before latest FY 1 1
Financing receivable, originated five or more years before latest FY 49 51
Financing receivable, before allowance for credit losses $ 64 $ 59