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Investments (Credit Quality of Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 239 $ 4,369
Financing receivable, originated in FY before latest FY 4,322 6,197
Financing receivable, originated two years before latest FY 6,194 1,089
Financing receivable, originated three years before latest FY 1,061 2,648
Financing receivable, originated four years before latest FY 2,621 2,191
Financing receivable, originated five or more years before latest FY 8,287 6,502
Financing receivable, before allowance for credit losses 22,724 22,996
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 129 2,419
Financing receivable, originated in FY before latest FY 2,417 3,191
Financing receivable, originated two years before latest FY 3,213 445
Financing receivable, originated three years before latest FY 442 1,879
Financing receivable, originated four years before latest FY 1,865 1,377
Financing receivable, originated five or more years before latest FY 5,322 4,236
Financing receivable, before allowance for credit losses $ 13,388 $ 13,547
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 $ 12,460 $ 12,132
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 93.10% 89.60%
Commercial | Debt Service Coverage Ratio, 1.00x to 1.20x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, before allowance for credit losses $ 431 $ 589
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% 4.30%
Commercial | Debt Service Coverage Ratio, Less than 1.00x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, before allowance for credit losses $ 497 $ 826
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% 6.10%
Commercial | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 79 $ 1,916
Financing receivable, originated in FY before latest FY 1,877 2,819
Financing receivable, originated two years before latest FY 2,672 405
Financing receivable, originated three years before latest FY 225 1,493
Financing receivable, originated four years before latest FY 1,290 888
Financing receivable, originated five or more years before latest FY 2,963 3,624
Financing receivable, before allowance for credit losses 9,106 11,145
Commercial | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 50 503
Financing receivable, originated in FY before latest FY 529 354
Financing receivable, originated two years before latest FY 523 0
Financing receivable, originated three years before latest FY 178 271
Financing receivable, originated four years before latest FY 269 367
Financing receivable, originated five or more years before latest FY 1,155 402
Financing receivable, before allowance for credit losses 2,704 1,897
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 11 18
Financing receivable, originated two years before latest FY 18 40
Financing receivable, originated three years before latest FY 39 90
Financing receivable, originated four years before latest FY 210 65
Financing receivable, originated five or more years before latest FY 536 48
Financing receivable, before allowance for credit losses 814 261
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 0 25
Financing receivable, originated four years before latest FY 96 57
Financing receivable, originated five or more years before latest FY 668 162
Financing receivable, before allowance for credit losses 764 244
Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 108 680
Financing receivable, originated in FY before latest FY 701 1,253
Financing receivable, originated two years before latest FY 1,248 477
Financing receivable, originated three years before latest FY 464 552
Financing receivable, originated four years before latest FY 542 645
Financing receivable, originated five or more years before latest FY 1,338 726
Financing receivable, before allowance for credit losses 4,401 4,333
Agricultural | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 108 532
Financing receivable, originated in FY before latest FY 562 1,163
Financing receivable, originated two years before latest FY 1,136 418
Financing receivable, originated three years before latest FY 432 496
Financing receivable, originated four years before latest FY 511 643
Financing receivable, originated five or more years before latest FY 1,320 710
Financing receivable, before allowance for credit losses 4,069 3,962
Agricultural | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0 148
Financing receivable, originated in FY before latest FY 139 90
Financing receivable, originated two years before latest FY 112 59
Financing receivable, originated three years before latest FY 32 56
Financing receivable, originated four years before latest FY 31 1
Financing receivable, originated five or more years before latest FY 18 16
Financing receivable, before allowance for credit losses 332 370
Agricultural | 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 0 0
Financing receivable, originated four years before latest FY 0 1
Financing receivable, originated five or more years before latest FY 0 0
Financing receivable, before allowance for credit losses 0 1
Residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 2 1,270
Financing receivable, originated in FY before latest FY 1,204 1,753
Financing receivable, originated two years before latest FY 1,733 167
Financing receivable, originated three years before latest FY 155 217
Financing receivable, originated four years before latest FY 214 169
Financing receivable, originated five or more years before latest FY 1,627 1,540
Financing receivable, before allowance for credit losses 4,935 5,116
Residential | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 2 1,266
Financing receivable, originated in FY before latest FY 1,195 1,745
Financing receivable, originated two years before latest FY 1,717 167
Financing receivable, originated three years before latest FY 155 215
Financing receivable, originated four years before latest FY 212 168
Financing receivable, originated five or more years before latest FY 1,576 1,491
Financing receivable, before allowance for credit losses 4,857 5,052
Residential | Nonperforming    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0 4
Financing receivable, originated in FY before latest FY 9 8
Financing receivable, originated two years before latest FY 16 0
Financing receivable, originated three years before latest FY 0 2
Financing receivable, originated four years before latest FY 2 1
Financing receivable, originated five or more years before latest FY 51 49
Financing receivable, before allowance for credit losses $ 78 $ 64