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Investments (Credit Quality of Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 514 $ 4,369
Financing receivable, originated in FY before latest FY 4,423 6,197
Financing receivable, originated two years before latest FY 6,136 1,089
Financing receivable, originated three years before latest FY 1,042 2,648
Financing receivable, originated four years before latest FY 2,600 2,191
Financing receivable, originated five or more years before latest FY 7,897 6,502
Financing receivable, before allowance for credit losses 22,612 22,996
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 206 2,419
Financing receivable, originated in FY before latest FY 2,417 3,191
Financing receivable, originated two years before latest FY 3,205 445
Financing receivable, originated three years before latest FY 438 1,879
Financing receivable, originated four years before latest FY 1,859 1,377
Financing receivable, originated five or more years before latest FY 5,064 4,236
Financing receivable, before allowance for credit losses $ 13,189 $ 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 $ 12,082 $ 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 91.60% 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 $ 702 $ 589
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 5.30% 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 $ 405 $ 826
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 3.10% 6.10%
Commercial | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 206 $ 1,916
Financing receivable, originated in FY before latest FY 655 2,819
Financing receivable, originated two years before latest FY 1,823 405
Financing receivable, originated three years before latest FY 177 1,493
Financing receivable, originated four years before latest FY 1,239 888
Financing receivable, originated five or more years before latest FY 2,628 3,624
Financing receivable, before allowance for credit losses 6,728 11,145
Commercial | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0 503
Financing receivable, originated in FY before latest FY 935 354
Financing receivable, originated two years before latest FY 1,079 0
Financing receivable, originated three years before latest FY 222 271
Financing receivable, originated four years before latest FY 261 367
Financing receivable, originated five or more years before latest FY 1,157 402
Financing receivable, before allowance for credit losses 3,654 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 427 18
Financing receivable, originated two years before latest FY 76 40
Financing receivable, originated three years before latest FY 39 90
Financing receivable, originated four years before latest FY 209 65
Financing receivable, originated five or more years before latest FY 563 48
Financing receivable, before allowance for credit losses 1,314 261
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 400 0
Financing receivable, originated two years before latest FY 227 0
Financing receivable, originated three years before latest FY 0 25
Financing receivable, originated four years before latest FY 150 57
Financing receivable, originated five or more years before latest FY 716 162
Financing receivable, before allowance for credit losses 1,493 244
Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 203 680
Financing receivable, originated in FY before latest FY 698 1,253
Financing receivable, originated two years before latest FY 1,240 477
Financing receivable, originated three years before latest FY 458 552
Financing receivable, originated four years before latest FY 535 645
Financing receivable, originated five or more years before latest FY 1,282 726
Financing receivable, before allowance for credit losses 4,416 4,333
Agricultural | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 202 532
Financing receivable, originated in FY before latest FY 571 1,163
Financing receivable, originated two years before latest FY 1,132 418
Financing receivable, originated three years before latest FY 452 496
Financing receivable, originated four years before latest FY 505 643
Financing receivable, originated five or more years before latest FY 1,265 710
Financing receivable, before allowance for credit losses 4,127 3,962
Agricultural | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 1 148
Financing receivable, originated in FY before latest FY 127 90
Financing receivable, originated two years before latest FY 108 59
Financing receivable, originated three years before latest FY 6 56
Financing receivable, originated four years before latest FY 30 1
Financing receivable, originated five or more years before latest FY 17 16
Financing receivable, before allowance for credit losses 289 370
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 105 1,270
Financing receivable, originated in FY before latest FY 1,308 1,753
Financing receivable, originated two years before latest FY 1,691 167
Financing receivable, originated three years before latest FY 146 217
Financing receivable, originated four years before latest FY 206 169
Financing receivable, originated five or more years before latest FY 1,551 1,540
Financing receivable, before allowance for credit losses 5,007 5,116
Residential | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 105 1,266
Financing receivable, originated in FY before latest FY 1,286 1,745
Financing receivable, originated two years before latest FY 1,669 167
Financing receivable, originated three years before latest FY 145 215
Financing receivable, originated four years before latest FY 204 168
Financing receivable, originated five or more years before latest FY 1,508 1,491
Financing receivable, before allowance for credit losses 4,917 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 22 8
Financing receivable, originated two years before latest FY 22 0
Financing receivable, originated three years before latest FY 1 2
Financing receivable, originated four years before latest FY 2 1
Financing receivable, originated five or more years before latest FY 43 49
Financing receivable, before allowance for credit losses $ 90 $ 64