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Investments (Credit Quality of Mortgage Loans by Portfolio Segment) (Details) - Mortgage Loans - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 1,054 $ 514
Financing receivable, originated in FY before latest FY 657 4,423
Financing receivable, originated two years before latest FY 4,430 6,136
Financing receivable, originated three years before latest FY 6,065 1,042
Financing receivable, originated four years before latest FY 982 2,600
Financing receivable, originated five or more years before latest FY 9,882 7,897
Financing receivable, before allowance for credit losses 23,070 22,612
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 515 206
Financing receivable, originated in FY before latest FY 199 2,417
Financing receivable, originated two years before latest FY 2,416 3,205
Financing receivable, originated three years before latest FY 3,173 438
Financing receivable, originated four years before latest FY 434 1,859
Financing receivable, originated five or more years before latest FY 6,514 5,064
Financing receivable, before allowance for credit losses $ 13,251 $ 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 $ 12,147 $ 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 91.70% 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 $ 663 $ 702
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% 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 $ 441 $ 405
Financing receivable, before allowance for credit losses by debt service coverage ratio as a percentage of financing receivable, before allowance for credit losses 3.30% 3.10%
Commercial | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY $ 448 $ 206
Financing receivable, originated in FY before latest FY 199 655
Financing receivable, originated two years before latest FY 609 1,823
Financing receivable, originated three years before latest FY 1,824 177
Financing receivable, originated four years before latest FY 221 1,239
Financing receivable, originated five or more years before latest FY 3,173 2,628
Financing receivable, before allowance for credit losses 6,474 6,728
Commercial | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 67 0
Financing receivable, originated in FY before latest FY 0 935
Financing receivable, originated two years before latest FY 876 1,079
Financing receivable, originated three years before latest FY 778 222
Financing receivable, originated four years before latest FY 38 261
Financing receivable, originated five or more years before latest FY 1,072 1,157
Financing receivable, before allowance for credit losses 2,831 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 415 76
Financing receivable, originated three years before latest FY 304 39
Financing receivable, originated four years before latest FY 175 209
Financing receivable, originated five or more years before latest FY 650 563
Financing receivable, before allowance for credit losses 1,544 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 516 227
Financing receivable, originated three years before latest FY 267 0
Financing receivable, originated four years before latest FY 0 150
Financing receivable, originated five or more years before latest FY 1,619 716
Financing receivable, before allowance for credit losses 2,402 1,493
Agricultural    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 245 203
Financing receivable, originated in FY before latest FY 222 698
Financing receivable, originated two years before latest FY 684 1,240
Financing receivable, originated three years before latest FY 1,208 458
Financing receivable, originated four years before latest FY 410 535
Financing receivable, originated five or more years before latest FY 1,721 1,282
Financing receivable, before allowance for credit losses 4,490 4,416
Agricultural | Loan-to-Value Ratio, Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 239 202
Financing receivable, originated in FY before latest FY 221 571
Financing receivable, originated two years before latest FY 554 1,132
Financing receivable, originated three years before latest FY 1,101 452
Financing receivable, originated four years before latest FY 397 505
Financing receivable, originated five or more years before latest FY 1,685 1,265
Financing receivable, before allowance for credit losses 4,197 4,127
Agricultural | Loan-to-Value Ratio, 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 6 1
Financing receivable, originated in FY before latest FY 1 127
Financing receivable, originated two years before latest FY 130 108
Financing receivable, originated three years before latest FY 107 6
Financing receivable, originated four years before latest FY 12 30
Financing receivable, originated five or more years before latest FY 17 17
Financing receivable, before allowance for credit losses 273 289
Agricultural | Loan-to-Value Ratio, 76% to 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 3  
Financing receivable, before allowance for credit losses 4  
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 0  
Financing receivable, originated five or more years before latest FY 16  
Financing receivable, before allowance for credit losses 16  
Residential    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 294 105
Financing receivable, originated in FY before latest FY 236 1,308
Financing receivable, originated two years before latest FY 1,330 1,691
Financing receivable, originated three years before latest FY 1,684 146
Financing receivable, originated four years before latest FY 138 206
Financing receivable, originated five or more years before latest FY 1,647 1,551
Financing receivable, before allowance for credit losses 5,329 5,007
Residential | Performing    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated in current FY 294 105
Financing receivable, originated in FY before latest FY 235 1,286
Financing receivable, originated two years before latest FY 1,298 1,669
Financing receivable, originated three years before latest FY 1,666 145
Financing receivable, originated four years before latest FY 137 204
Financing receivable, originated five or more years before latest FY 1,598 1,508
Financing receivable, before allowance for credit losses 5,228 4,917
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 22
Financing receivable, originated two years before latest FY 32 22
Financing receivable, originated three years before latest FY 18 1
Financing receivable, originated four years before latest FY 1 2
Financing receivable, originated five or more years before latest FY 49 43
Financing receivable, before allowance for credit losses $ 101 $ 90