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Investments - Schedule of Investment in CMLs by Loan to Value and Debt Service Coverage Ratios (Details) - Commercial Mortgage - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Loans $ 3,303 $ 2,722
% of Total 100.00% 100.00%
Credit Quality Indicator Current Year [Abstract]    
Year one $ 588 $ 273
Year two 292 227
Year three 238 290
Year four 291 1,253
Year five 1,253 469
Prior 641 210
Total 3,303 2,722
Credit Quality Indicator Prior Year [Abstract]    
Year one 588 273
Year two 292 227
Year three 238 290
Year four 291 1,253
Year five 1,253 469
Prior 641 210
Total 3,303 2,722
Fair Value    
Schedule of Investments [Line Items]    
Loans $ 3,068 $ 2,404
% of Total 100.00% 100.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 3,068 $ 2,404
Credit Quality Indicator Prior Year [Abstract]    
Total 3,068 2,404
Less than 50.00%    
Schedule of Investments [Line Items]    
Loans $ 674 $ 524
% of Total 20.00% 19.00%
Credit Quality Indicator Current Year [Abstract]    
Year one $ 146 $ 66
Year two 49 99
Year three 110 19
Year four 20 74
Year five 75 189
Prior 274 77
Total 674 524
Credit Quality Indicator Prior Year [Abstract]    
Year one 146 66
Year two 49 99
Year three 110 19
Year four 20 74
Year five 75 189
Prior 274 77
Total 674 524
Less than 50.00% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 657 $ 501
% of Total 21.00% 21.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 657 $ 501
Credit Quality Indicator Prior Year [Abstract]    
Total 657 501
50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans $ 953 $ 927
% of Total 29.00% 34.00%
Credit Quality Indicator Current Year [Abstract]    
Year one $ 157 $ 112
Year two 29 53
Year three 53 149
Year four 149 321
Year five 321 159
Prior 244 133
Total 953 927
Credit Quality Indicator Prior Year [Abstract]    
Year one 157 112
Year two 29 53
Year three 53 149
Year four 149 321
Year five 321 159
Prior 244 133
Total 953 927
50.00% to 59.99% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 881 $ 826
% of Total 29.00% 34.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 881 $ 826
Credit Quality Indicator Prior Year [Abstract]    
Total 881 826
60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans $ 1,659 $ 1,254
% of Total 50.00% 46.00%
Credit Quality Indicator Current Year [Abstract]    
Year one $ 285 $ 91
Year two 210 71
Year three 71 113
Year four 113 858
Year five 857 121
Prior 123 0
Total 1,659 1,254
Credit Quality Indicator Prior Year [Abstract]    
Year one 285 91
Year two 210 71
Year three 71 113
Year four 113 858
Year five 857 121
Prior 123 0
Total 1,659 1,254
60.00% to 74.99% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 1,513 $ 1,060
% of Total 49.00% 44.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 1,513 $ 1,060
Credit Quality Indicator Prior Year [Abstract]    
Total 1,513 1,060
75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans $ 17 $ 17
% of Total 1.00% 1.00%
Credit Quality Indicator Current Year [Abstract]    
Year one $ 0 $ 4
Year two 4 4
Year three 4 9
Year four 9 0
Year five 0 0
Prior 0 0
Total 17 17
Credit Quality Indicator Prior Year [Abstract]    
Year one 0 4
Year two 4 4
Year three 4 9
Year four 9 0
Year five 0 0
Prior 0 0
Total 17 17
75.00% to 84.99% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 17 $ 17
% of Total 1.00% 1.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 17 $ 17
Credit Quality Indicator Prior Year [Abstract]    
Total 17 17
Greater than 1.25    
Schedule of Investments [Line Items]    
Loans 3,041 2,535
Credit Quality Indicator Current Year [Abstract]    
Year one 527 140
Year two 141 215
Year three 226 278
Year four 279 1,241
Year five 1,241 469
Prior 627 192
Total 3,041 2,535
Credit Quality Indicator Prior Year [Abstract]    
Year one 527 140
Year two 141 215
Year three 226 278
Year four 279 1,241
Year five 1,241 469
Prior 627 192
Total 3,041 2,535
Greater than 1.25 | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 658 490
Credit Quality Indicator Current Year [Abstract]    
Total 658 490
Credit Quality Indicator Prior Year [Abstract]    
Total 658 490
Greater than 1.25 | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 912 803
Credit Quality Indicator Current Year [Abstract]    
Total 912 803
Credit Quality Indicator Prior Year [Abstract]    
Total 912 803
Greater than 1.25 | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 1,467 1,238
Credit Quality Indicator Current Year [Abstract]    
Total 1,467 1,238
Credit Quality Indicator Prior Year [Abstract]    
Total 1,467 1,238
Greater than 1.25 | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans 4 4
Credit Quality Indicator Current Year [Abstract]    
Total 4 4
Credit Quality Indicator Prior Year [Abstract]    
Total 4 4
Greater than 1.00 but less than 1.25    
Schedule of Investments [Line Items]    
Loans 241 166
Credit Quality Indicator Current Year [Abstract]    
Year one 61 133
Year two 151 12
Year three 12 3
Year four 3 0
Year five 0 0
Prior 14 18
Total 241 166
Credit Quality Indicator Prior Year [Abstract]    
Year one 61 133
Year two 151 12
Year three 12 3
Year four 3 0
Year five 0 0
Prior 14 18
Total 241 166
Greater than 1.00 but less than 1.25 | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 16 34
Credit Quality Indicator Current Year [Abstract]    
Total 16 34
Credit Quality Indicator Prior Year [Abstract]    
Total 16 34
Greater than 1.00 but less than 1.25 | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 29 112
Credit Quality Indicator Current Year [Abstract]    
Total 29 112
Credit Quality Indicator Prior Year [Abstract]    
Total 29 112
Greater than 1.00 but less than 1.25 | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 192 16
Credit Quality Indicator Current Year [Abstract]    
Total 192 16
Credit Quality Indicator Prior Year [Abstract]    
Total 192 16
Greater than 1.00 but less than 1.25 | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans 4 4
Credit Quality Indicator Current Year [Abstract]    
Total 4 4
Credit Quality Indicator Prior Year [Abstract]    
Total 4 4
Less than 1.00    
Schedule of Investments [Line Items]    
Loans 21 21
Credit Quality Indicator Current Year [Abstract]    
Year one 0 0
Year two 0 0
Year three 0 9
Year four 9 12
Year five 12 0
Prior 0 0
Total 21 21
Credit Quality Indicator Prior Year [Abstract]    
Year one 0 0
Year two 0 0
Year three 0 9
Year four 9 12
Year five 12 0
Prior 0 0
Total 21 21
Less than 1.00 | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 0 0
Credit Quality Indicator Current Year [Abstract]    
Total 0 0
Credit Quality Indicator Prior Year [Abstract]    
Total 0 0
Less than 1.00 | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 12 12
Credit Quality Indicator Current Year [Abstract]    
Total 12 12
Credit Quality Indicator Prior Year [Abstract]    
Total 12 12
Less than 1.00 | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 0 0
Credit Quality Indicator Current Year [Abstract]    
Total 0 0
Credit Quality Indicator Prior Year [Abstract]    
Total 0 0
Less than 1.00 | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans 9 9
Credit Quality Indicator Current Year [Abstract]    
Total 9 9
Credit Quality Indicator Prior Year [Abstract]    
Total $ 9 $ 9