v3.26.1
Investments (Credit Quality of Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 387 $ 2,061
Financing receivable, originated in FY before latest FY 2,295 1,811
Financing receivable, originated two years before latest FY 1,758 532
Financing receivable, originated three years before latest FY 495 3,778
Financing receivable, originated four years before latest FY 3,698 5,573
Financing receivable, originated five or more years before latest FY 14,172 9,171
Financing receivable, before allowance for credit losses 22,805 22,926
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 282 730
Financing receivable, originated in FY before latest FY 730 848
Financing receivable, originated two years before latest FY 848 157
Financing receivable, originated three years before latest FY 136 1,932
Financing receivable, originated four years before latest FY 1,887 2,895
Financing receivable, originated five or more years before latest FY 8,248 5,757
Financing receivable, before allowance for credit losses $ 12,131 $ 12,319
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 $ 10,899 $ 11,154
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 89.80% 90.50%
Commercial | Debt Service Coverage Ratio, 1.00x to 1.20x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, before allowance for credit losses $ 750 $ 738
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 6.20% 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 $ 482 $ 427
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 4.00% 3.50%
Commercial | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 98 $ 423
Financing receivable, originated in FY before latest FY 423 668
Financing receivable, originated two years before latest FY 668 157
Financing receivable, originated three years before latest FY 136 483
Financing receivable, originated four years before latest FY 437 1,713
Financing receivable, originated five or more years before latest FY 4,333 2,903
Financing receivable, before allowance for credit losses 6,095 6,347
Commercial | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 184 262
Financing receivable, originated in FY before latest FY 262 180
Financing receivable, originated two years before latest FY 180 0
Financing receivable, originated three years before latest FY 0 583
Financing receivable, originated four years before latest FY 583 651
Financing receivable, originated five or more years before latest FY 1,470 717
Financing receivable, before allowance for credit losses 2,679 2,393
Commercial | Loan-to-Value Ratio, 76% to 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0 9
Financing receivable, originated in FY before latest FY 9 0
Financing receivable, originated two years before latest FY 0 0
Financing receivable, originated three years before latest FY 0 205
Financing receivable, originated four years before latest FY 205 287
Financing receivable, originated five or more years before latest FY 695 605
Financing receivable, before allowance for credit losses 909 1,106
Commercial | Loan-to-Value Ratio, Greater than 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0 36
Financing receivable, originated in FY before latest FY 36 0
Financing receivable, originated two years before latest FY 0 0
Financing receivable, originated three years before latest FY 0 661
Financing receivable, originated four years before latest FY 662 244
Financing receivable, originated five or more years before latest FY 1,750 1,532
Financing receivable, before allowance for credit losses 2,448 2,473
Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 93 458
Financing receivable, originated in FY before latest FY 461 341
Financing receivable, originated two years before latest FY 339 207
Financing receivable, originated three years before latest FY 205 655
Financing receivable, originated four years before latest FY 651 1,151
Financing receivable, originated five or more years before latest FY 2,873 1,819
Financing receivable, before allowance for credit losses 4,622 4,631
Agricultural | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 93 415
Financing receivable, originated in FY before latest FY 418 341
Financing receivable, originated two years before latest FY 339 190
Financing receivable, originated three years before latest FY 188 558
Financing receivable, originated four years before latest FY 555 1,048
Financing receivable, originated five or more years before latest FY 2,750 1,798
Financing receivable, before allowance for credit losses 4,343 4,350
Agricultural | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0 43
Financing receivable, originated in FY before latest FY 43 0
Financing receivable, originated two years before latest FY 0 17
Financing receivable, originated three years before latest FY 17 97
Financing receivable, originated four years before latest FY 96 100
Financing receivable, originated five or more years before latest FY 117 18
Financing receivable, before allowance for credit losses 273 275
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 0
Financing receivable, originated five or more years before latest FY 3 3
Financing receivable, before allowance for credit losses 3 3
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 3
Financing receivable, originated five or more years before latest FY 3 0
Financing receivable, before allowance for credit losses 3 3
Residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 12 873
Financing receivable, originated in FY before latest FY 1,104 622
Financing receivable, originated two years before latest FY 571 168
Financing receivable, originated three years before latest FY 154 1,191
Financing receivable, originated four years before latest FY 1,160 1,527
Financing receivable, originated five or more years before latest FY 3,051 1,595
Financing receivable, before allowance for credit losses 6,052 5,976
Residential | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 12 873
Financing receivable, originated in FY before latest FY 1,103 622
Financing receivable, originated two years before latest FY 571 168
Financing receivable, originated three years before latest FY 154 1,146
Financing receivable, originated four years before latest FY 1,119 1,505
Financing receivable, originated five or more years before latest FY 2,987 1,554
Financing receivable, before allowance for credit losses 5,946 5,868
Residential | Nonperforming    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 0 0
Financing receivable, originated in FY before latest FY 1 0
Financing receivable, originated two years before latest FY 0 0
Financing receivable, originated three years before latest FY 0 45
Financing receivable, originated four years before latest FY 41 22
Financing receivable, originated five or more years before latest FY 64 41
Financing receivable, before allowance for credit losses $ 106 $ 108