v3.26.1
Investments - Schedule of Investment in CMLs by Loan to Value and Debt Service Coverage Ratios (Details) - Commercial Mortgage - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Schedule of Investments [Line Items]    
Loans $ 3,538 $ 3,260
% of Total 100.00% 100.00%
Credit Quality Indicator Current Year [Abstract]    
Year one $ 319 $ 646
Year two 612 295
Year three 292 194
Year four 195 292
Year five 292 1,252
Prior 1,828 581
Total 3,538 3,260
Credit Quality Indicator Prior Year [Abstract]    
Year one 319 646
Year two 612 295
Year three 292 194
Year four 195 292
Year five 292 1,252
Prior 1,828 581
Total 3,538 3,260
Fair Value    
Schedule of Investments [Line Items]    
Loans $ 3,303 $ 3,025
% of Total 100.00% 100.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 3,303 $ 3,025
Credit Quality Indicator Prior Year [Abstract]    
Total 3,303 3,025
Less than 50.00%    
Schedule of Investments [Line Items]    
Loans $ 773 $ 610
% of Total 22.00% 19.00%
Credit Quality Indicator Current Year [Abstract]    
Year one $ 125 $ 148
Year two 147 49
Year three 87 66
Year four 67 21
Year five 21 75
Prior 326 251
Total 773 610
Credit Quality Indicator Prior Year [Abstract]    
Year one 125 148
Year two 147 49
Year three 87 66
Year four 67 21
Year five 21 75
Prior 326 251
Total 773 610
Less than 50.00% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 757 $ 596
% of Total 23.00% 19.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 757 $ 596
Credit Quality Indicator Prior Year [Abstract]    
Total 757 596
50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans $ 928 $ 923
% of Total 26.00% 28.00%
Credit Quality Indicator Current Year [Abstract]    
Year one $ 45 $ 157
Year two 155 36
Year three 0 53
Year four 54 149
Year five 150 320
Prior 524 208
Total 928 923
Credit Quality Indicator Prior Year [Abstract]    
Year one 45 157
Year two 155 36
Year three 0 53
Year four 54 149
Year five 150 320
Prior 524 208
Total 928 923
50.00% to 59.99% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 860 $ 852
% of Total 26.00% 28.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 860 $ 852
Credit Quality Indicator Prior Year [Abstract]    
Total 860 852
60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans $ 1,807 $ 1,709
% of Total 51.00% 52.00%
Credit Quality Indicator Current Year [Abstract]    
Year one $ 136 $ 341
Year two 310 206
Year three 201 70
Year four 70 113
Year five 112 857
Prior 978 122
Total 1,807 1,709
Credit Quality Indicator Prior Year [Abstract]    
Year one 136 341
Year two 310 206
Year three 201 70
Year four 70 113
Year five 112 857
Prior 978 122
Total 1,807 1,709
60.00% to 74.99% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 1,656 $ 1,560
% of Total 50.00% 52.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 1,656 $ 1,560
Credit Quality Indicator Prior Year [Abstract]    
Total 1,656 1,560
75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans $ 30 $ 18
% of Total 1.00% 1.00%
Credit Quality Indicator Current Year [Abstract]    
Year one $ 13 $ 0
Year two 0 4
Year three 4 5
Year four 4 9
Year five 9 0
Prior 0 0
Total 30 18
Credit Quality Indicator Prior Year [Abstract]    
Year one 13 0
Year two 0 4
Year three 4 5
Year four 4 9
Year five 9 0
Prior 0 0
Total 30 18
75.00% to 84.99% | Fair Value    
Schedule of Investments [Line Items]    
Loans $ 30 $ 17
% of Total 1.00% 1.00%
Credit Quality Indicator Current Year [Abstract]    
Total $ 30 $ 17
Credit Quality Indicator Prior Year [Abstract]    
Total 30 17
Greater than 1.25    
Schedule of Investments [Line Items]    
Loans 3,007 2,859
Credit Quality Indicator Current Year [Abstract]    
Year one 194 469
Year two 436 140
Year three 142 182
Year four 182 283
Year five 283 1,240
Prior 1,770 545
Total 3,007 2,859
Credit Quality Indicator Prior Year [Abstract]    
Year one 194 469
Year two 436 140
Year three 142 182
Year four 182 283
Year five 283 1,240
Prior 1,770 545
Total 3,007 2,859
Greater than 1.25 | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 720 594
Credit Quality Indicator Current Year [Abstract]    
Total 720 594
Credit Quality Indicator Prior Year [Abstract]    
Total 720 594
Greater than 1.25 | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 875 850
Credit Quality Indicator Current Year [Abstract]    
Total 875 850
Credit Quality Indicator Prior Year [Abstract]    
Total 875 850
Greater than 1.25 | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 1,405 1,415
Credit Quality Indicator Current Year [Abstract]    
Total 1,405 1,415
Credit Quality Indicator Prior Year [Abstract]    
Total 1,405 1,415
Greater than 1.25 | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans 7 0
Credit Quality Indicator Current Year [Abstract]    
Total 7 0
Credit Quality Indicator Prior Year [Abstract]    
Total 7 0
Greater than 1.00 but less than 1.25    
Schedule of Investments [Line Items]    
Loans 460 349
Credit Quality Indicator Current Year [Abstract]    
Year one 116 169
Year two 169 155
Year three 150 12
Year four 13 0
Year five 0 0
Prior 12 13
Total 460 349
Credit Quality Indicator Prior Year [Abstract]    
Year one 116 169
Year two 169 155
Year three 150 12
Year four 13 0
Year five 0 0
Prior 12 13
Total 460 349
Greater than 1.00 but less than 1.25 | Less than 50.00%    
Schedule of Investments [Line Items]    
Loans 53 16
Credit Quality Indicator Current Year [Abstract]    
Total 53 16
Credit Quality Indicator Prior Year [Abstract]    
Total 53 16
Greater than 1.00 but less than 1.25 | 50.00% to 59.99%    
Schedule of Investments [Line Items]    
Loans 6 36
Credit Quality Indicator Current Year [Abstract]    
Total 6 36
Credit Quality Indicator Prior Year [Abstract]    
Total 6 36
Greater than 1.00 but less than 1.25 | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 387 288
Credit Quality Indicator Current Year [Abstract]    
Total 387 288
Credit Quality Indicator Prior Year [Abstract]    
Total 387 288
Greater than 1.00 but less than 1.25 | 75.00% to 84.99%    
Schedule of Investments [Line Items]    
Loans 14 9
Credit Quality Indicator Current Year [Abstract]    
Total 14 9
Credit Quality Indicator Prior Year [Abstract]    
Total 14 9
Less than 1.00    
Schedule of Investments [Line Items]    
Loans 71 52
Credit Quality Indicator Current Year [Abstract]    
Year one 9 8
Year two 7 0
Year three 0 0
Year four 0 9
Year five 9 12
Prior 46 23
Total 71 52
Credit Quality Indicator Prior Year [Abstract]    
Year one 9 8
Year two 7 0
Year three 0 0
Year four 0 9
Year five 9 12
Prior 46 23
Total 71 52
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 47 37
Credit Quality Indicator Current Year [Abstract]    
Total 47 37
Credit Quality Indicator Prior Year [Abstract]    
Total 47 37
Less than 1.00 | 60.00% to 74.99%    
Schedule of Investments [Line Items]    
Loans 15 6
Credit Quality Indicator Current Year [Abstract]    
Total 15 6
Credit Quality Indicator Prior Year [Abstract]    
Total 15 6
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