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Investments (Credit Quality of Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 179 $ 1,843
Financing receivable, originated in FY before latest FY 1,946 642
Financing receivable, originated two years before latest FY 631 4,376
Financing receivable, originated three years before latest FY 4,294 5,999
Financing receivable, originated four years before latest FY 5,802 986
Financing receivable, originated five or more years before latest FY 10,378 9,586
Financing receivable, before allowance for credit losses 23,230 23,432
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 99 848
Financing receivable, originated in FY before latest FY 847 199
Financing receivable, originated two years before latest FY 198 2,390
Financing receivable, originated three years before latest FY 2,343 3,152
Financing receivable, originated four years before latest FY 3,000 432
Financing receivable, originated five or more years before latest FY 6,644 6,305
Financing receivable, before allowance for credit losses $ 13,131 $ 13,326
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 $ 11,681 $ 12,029
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 89.00% 90.30%
Commercial | Debt Service Coverage Ratio, 1.00x to 1.20x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, before allowance for credit losses $ 847 $ 801
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% 6.00%
Commercial | Debt Service Coverage Ratio, Less than 1.00x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, before allowance for credit losses $ 603 $ 496
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 5.00% 3.70%
Commercial | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 26 $ 640
Financing receivable, originated in FY before latest FY 639 199
Financing receivable, originated two years before latest FY 198 279
Financing receivable, originated three years before latest FY 292 1,850
Financing receivable, originated four years before latest FY 1,848 196
Financing receivable, originated five or more years before latest FY 2,953 2,844
Financing receivable, before allowance for credit losses 5,956 6,008
Commercial | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 42 208
Financing receivable, originated in FY before latest FY 208 0
Financing receivable, originated two years before latest FY 0 1,022
Financing receivable, originated three years before latest FY 984 713
Financing receivable, originated four years before latest FY 680 62
Financing receivable, originated five or more years before latest FY 1,231 1,171
Financing receivable, before allowance for credit losses 3,145 3,176
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 0
Financing receivable, originated two years before latest FY 0 117
Financing receivable, originated three years before latest FY 117 201
Financing receivable, originated four years before latest FY 201 174
Financing receivable, originated five or more years before latest FY 823 601
Financing receivable, before allowance for credit losses 1,141 1,093
Commercial | Loan-to-Value Ratio, Greater than 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 31 0
Financing receivable, originated in FY before latest FY 0 0
Financing receivable, originated two years before latest FY 0 972
Financing receivable, originated three years before latest FY 950 388
Financing receivable, originated four years before latest FY 271 0
Financing receivable, originated five or more years before latest FY 1,637 1,689
Financing receivable, before allowance for credit losses 2,889 3,049
Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 75 408
Financing receivable, originated in FY before latest FY 370 221
Financing receivable, originated two years before latest FY 218 674
Financing receivable, originated three years before latest FY 669 1,186
Financing receivable, originated four years before latest FY 1,172 407
Financing receivable, originated five or more years before latest FY 2,012 1,667
Financing receivable, before allowance for credit losses 4,516 4,563
Agricultural | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 75 408
Financing receivable, originated in FY before latest FY 370 203
Financing receivable, originated two years before latest FY 201 594
Financing receivable, originated three years before latest FY 589 1,073
Financing receivable, originated four years before latest FY 1,061 400
Financing receivable, originated five or more years before latest FY 1,986 1,632
Financing receivable, before allowance for credit losses 4,282 4,310
Agricultural | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0 0
Financing receivable, originated in FY before latest FY 0 18
Financing receivable, originated two years before latest FY 17 80
Financing receivable, originated three years before latest FY 80 113
Financing receivable, originated four years before latest FY 111 6
Financing receivable, originated five or more years before latest FY 25 19
Financing receivable, before allowance for credit losses 233 236
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 0 1
Financing receivable, originated five or more years before latest FY 1 0
Financing receivable, before allowance for credit losses 1 1
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 0 16
Financing receivable, before allowance for credit losses 0 16
Residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 5 587
Financing receivable, originated in FY before latest FY 729 222
Financing receivable, originated two years before latest FY 215 1,312
Financing receivable, originated three years before latest FY 1,282 1,661
Financing receivable, originated four years before latest FY 1,630 147
Financing receivable, originated five or more years before latest FY 1,722 1,614
Financing receivable, before allowance for credit losses 5,583 5,543
Residential | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 5 586
Financing receivable, originated in FY before latest FY 729 222
Financing receivable, originated two years before latest FY 215 1,268
Financing receivable, originated three years before latest FY 1,234 1,640
Financing receivable, originated four years before latest FY 1,605 146
Financing receivable, originated five or more years before latest FY 1,670 1,563
Financing receivable, before allowance for credit losses 5,458 5,425
Residential | Nonperforming    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0 1
Financing receivable, originated in FY before latest FY 0 0
Financing receivable, originated two years before latest FY 0 44
Financing receivable, originated three years before latest FY 48 21
Financing receivable, originated four years before latest FY 25 1
Financing receivable, originated five or more years before latest FY 52 51
Financing receivable, before allowance for credit losses $ 125 $ 118