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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
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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

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