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Investments (Credit Quality of Commercial Mortgage Loans) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage Loans, Gross $ 87,104 $ 89,812
Commercial Mortgage Loans    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year 2,441  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 4,198  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 2,927  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 5,980  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 6,232  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 28,302  
Financing Receivable, Revolving 2,111  
Mortgage Loans, Gross $ 52,191 $ 56,310
Loans Receivable Commercial Mortgage Percentage 100.00%  
Commercial Mortgage Loans | Greater than 1.20x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 2,110  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 3,654  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 2,125  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 5,213  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 5,161  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 23,149  
Financing Receivable, Revolving 2,069  
Mortgage Loans, Gross $ 43,481  
Loans Receivable Commercial Mortgage Percentage 83.30%  
Commercial Mortgage Loans | 1.00x - 1.20x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 138  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 324  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 538  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 295  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 816  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 2,661  
Financing Receivable, Revolving 42  
Mortgage Loans, Gross $ 4,814  
Loans Receivable Commercial Mortgage Percentage 9.20%  
Commercial Mortgage Loans | Less than 1.00x    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 193  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 220  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 264  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 472  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 255  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 2,492  
Financing Receivable, Revolving 0  
Mortgage Loans, Gross $ 3,896  
Loans Receivable Commercial Mortgage Percentage 7.50%  
Commercial Mortgage Loans | Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 2,061  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 3,234  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 2,308  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 2,069  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 3,019  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 12,066  
Financing Receivable, Revolving 2,111  
Mortgage Loans, Gross $ 26,868  
Loans Receivable Commercial Mortgage Percentage 51.50%  
Commercial Mortgage Loans | 65% to 75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 193  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 783  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 494  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 2,522  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 1,781  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 3,914  
Financing Receivable, Revolving 0  
Mortgage Loans, Gross $ 9,687  
Loans Receivable Commercial Mortgage Percentage 18.60%  
Commercial Mortgage Loans | 76% to 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 4  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 462  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 174  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 2,188  
Financing Receivable, Revolving 0  
Mortgage Loans, Gross $ 2,828  
Loans Receivable Commercial Mortgage Percentage 5.40%  
Commercial Mortgage Loans | Greater than 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 187  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 181  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 121  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 927  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 1,258  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 10,134  
Financing Receivable, Revolving 0  
Mortgage Loans, Gross $ 12,808  
Loans Receivable Commercial Mortgage Percentage 24.50%