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Investments (Credit Quality of Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 1,843 $ 514
Financing receivable, originated in FY before latest FY 642 4,423
Financing receivable, originated two years before latest FY 4,376 6,136
Financing receivable, originated three years before latest FY 5,999 1,042
Financing receivable, originated four years before latest FY 986 2,600
Financing receivable, originated five or more years before latest FY 9,586 7,897
Financing receivable, before allowance for credit losses 23,432 22,612
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 848 206
Financing receivable, originated in FY before latest FY 199 2,417
Financing receivable, originated two years before latest FY 2,390 3,205
Financing receivable, originated three years before latest FY 3,152 438
Financing receivable, originated four years before latest FY 432 1,859
Financing receivable, originated five or more years before latest FY 6,305 5,064
Financing receivable, before allowance for credit losses $ 13,326 $ 13,189
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 $ 12,029 $ 12,082
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 90.30% 91.60%
Commercial | Debt Service Coverage Ratio, 1.00x to 1.20x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, before allowance for credit losses $ 801 $ 702
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 6.00% 5.30%
Commercial | Debt Service Coverage Ratio, Less than 1.00x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, before allowance for credit losses $ 496 $ 405
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 | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 640 $ 206
Financing receivable, originated in FY before latest FY 199 655
Financing receivable, originated two years before latest FY 279 1,823
Financing receivable, originated three years before latest FY 1,850 177
Financing receivable, originated four years before latest FY 196 1,239
Financing receivable, originated five or more years before latest FY 2,844 2,628
Financing receivable, before allowance for credit losses 6,008 6,728
Commercial | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 208 0
Financing receivable, originated in FY before latest FY 0 935
Financing receivable, originated two years before latest FY 1,022 1,079
Financing receivable, originated three years before latest FY 713 222
Financing receivable, originated four years before latest FY 62 261
Financing receivable, originated five or more years before latest FY 1,171 1,157
Financing receivable, before allowance for credit losses 3,176 3,654
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 0 427
Financing receivable, originated two years before latest FY 117 76
Financing receivable, originated three years before latest FY 201 39
Financing receivable, originated four years before latest FY 174 209
Financing receivable, originated five or more years before latest FY 601 563
Financing receivable, before allowance for credit losses 1,093 1,314
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 0 400
Financing receivable, originated two years before latest FY 972 227
Financing receivable, originated three years before latest FY 388 0
Financing receivable, originated four years before latest FY 0 150
Financing receivable, originated five or more years before latest FY 1,689 716
Financing receivable, before allowance for credit losses 3,049 1,493
Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 408 203
Financing receivable, originated in FY before latest FY 221 698
Financing receivable, originated two years before latest FY 674 1,240
Financing receivable, originated three years before latest FY 1,186 458
Financing receivable, originated four years before latest FY 407 535
Financing receivable, originated five or more years before latest FY 1,667 1,282
Financing receivable, before allowance for credit losses 4,563 4,416
Agricultural | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 408 202
Financing receivable, originated in FY before latest FY 203 571
Financing receivable, originated two years before latest FY 594 1,132
Financing receivable, originated three years before latest FY 1,073 452
Financing receivable, originated four years before latest FY 400 505
Financing receivable, originated five or more years before latest FY 1,632 1,265
Financing receivable, before allowance for credit losses 4,310 4,127
Agricultural | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0 1
Financing receivable, originated in FY before latest FY 18 127
Financing receivable, originated two years before latest FY 80 108
Financing receivable, originated three years before latest FY 113 6
Financing receivable, originated four years before latest FY 6 30
Financing receivable, originated five or more years before latest FY 19 17
Financing receivable, before allowance for credit losses 236 289
Agricultural | 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 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 1 0
Financing receivable, originated five or more years before latest FY 0 0
Financing receivable, before allowance for credit losses 1 0
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 0
Financing receivable, originated five or more years before latest FY 16 0
Financing receivable, before allowance for credit losses 16 0
Residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 587 105
Financing receivable, originated in FY before latest FY 222 1,308
Financing receivable, originated two years before latest FY 1,312 1,691
Financing receivable, originated three years before latest FY 1,661 146
Financing receivable, originated four years before latest FY 147 206
Financing receivable, originated five or more years before latest FY 1,614 1,551
Financing receivable, before allowance for credit losses 5,543 5,007
Residential | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 586 105
Financing receivable, originated in FY before latest FY 222 1,286
Financing receivable, originated two years before latest FY 1,268 1,669
Financing receivable, originated three years before latest FY 1,640 145
Financing receivable, originated four years before latest FY 146 204
Financing receivable, originated five or more years before latest FY 1,563 1,508
Financing receivable, before allowance for credit losses 5,425 4,917
Residential | Nonperforming    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 1 0
Financing receivable, originated in FY before latest FY 0 22
Financing receivable, originated two years before latest FY 44 22
Financing receivable, originated three years before latest FY 21 1
Financing receivable, originated four years before latest FY 1 2
Financing receivable, originated five or more years before latest FY 51 43
Financing receivable, before allowance for credit losses $ 118 $ 90