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Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - Significant
Unobservable
Inputs
(Level 3) - Fair Value, Measurements, Recurring - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]            
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent    
Assets            
Beginning balance $ 3,435 $ 3,042 $ 2,992 $ 2,487    
Total realized/unrealized gains (losses), Included in net income 7 (3) (9) (4)    
Total realized/unrealized gains (losses), Included in OCI 4 64 71 43    
Purchases 830 556 1,864 1,527    
Settlements (487) (143) (787) (269)    
Sales (12) (26) (98) (77)    
Transfers into Level 3 2 37 83 43    
Transfers out of Level 3 (37) (474) (374) (697)    
Ending balance $ 3,742 3,053 $ 3,742 3,053    
Liabilities            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs   5   5 $ 0 $ 0
Realized/unrealized gain/loss included in net income, liabilities   0   0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)   0   0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases   5   5    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements   0   0    
Sales   0   0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3   0   0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3   $ 0   $ 0    
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized losses Net realized losses Net realized losses Net realized losses    
Fair Value by Liability Class [Domain]            
Liabilities            
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value   $ 5   $ 5 0 0
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities   0   0    
Total realized/unrealized gains (losses), Included in OCI   0   0    
Purchases   5   5    
Settlements   0   0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales   0   0    
Transfers into Level 3   0   0    
Transfers out of Level 3   0   0    
Equity            
Liabilities            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs   5   5 $ 0 $ 0
Realized/unrealized gain/loss included in net income, liabilities   0   0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss)   0   0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases   5   5    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements   0   0    
Sales   0   0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3   0   0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3   0   0    
Equity securities, at fair value            
Assets            
Beginning balance $ 93 58 $ 87 58    
Total realized/unrealized gains (losses), Included in net income 0 4 (1) 4    
Total realized/unrealized gains (losses), Included in OCI 0 0 0 0    
Purchases 29 19 39 19    
Settlements (16) (1) (19) (1)    
Sales 0 (3) 0 (3)    
Transfers into Level 3 0 0 0 0    
Transfers out of Level 3 0 0 0 0    
Ending balance 106 77 106 77    
Short-term investments            
Assets            
Beginning balance 116 25 98 25    
Total realized/unrealized gains (losses), Included in net income 0 0 0 0    
Total realized/unrealized gains (losses), Included in OCI 0 0 0 0    
Purchases 201 3 268 4    
Settlements (110) (19) (159) (20)    
Sales 0 0 0 0    
Transfers into Level 3 0 0 0 0    
Transfers out of Level 3 0 0 0 0    
Ending balance 207 9 207 9    
Available-for-sale Securities [Member] | Total Fixed Maturities, AFS            
Assets            
Beginning balance 3,045 2,799 2,610 2,237    
Total realized/unrealized gains (losses), Included in net income 0 (2) 2 (4)    
Total realized/unrealized gains (losses), Included in OCI 4 64 71 43    
Purchases 593 534 1,542 1,504    
Settlements (357) (120) (598) (237)    
Sales (12) (23) (98) (74)    
Transfers into Level 3 2 37 83 43    
Transfers out of Level 3 (37) (474) (374) (697)    
Ending balance 3,238 2,815 3,238 2,815    
Fair Value Option, Other Eligible Items | Total Fixed Maturities, AFS            
Assets            
Beginning balance 181   197      
Total realized/unrealized gains (losses), Included in net income 7   (10)      
Total realized/unrealized gains (losses), Included in OCI 0   0      
Purchases 7   15      
Settlements (4)   (11)      
Sales 0   0      
Transfers into Level 3 0   0      
Transfers out of Level 3 0   0      
Ending balance 191   191      
ABS | Available-for-sale Securities [Member] | Total Fixed Maturities, AFS            
Assets            
Beginning balance 92 8 22 0    
Total realized/unrealized gains (losses), Included in net income 0 0 0 0    
Total realized/unrealized gains (losses), Included in OCI 0 0 1 0    
Purchases 13 40 86 56    
Settlements (12) 0 (16) 0    
Sales 0 0 0 0    
Transfers into Level 3 0 0 0 0    
Transfers out of Level 3 (10) 0 (10) (8)    
Ending balance 83 48 83 48    
Collateralized Loan Obligations [Member] | Available-for-sale Securities [Member] | Total Fixed Maturities, AFS            
Assets            
Beginning balance 70 500 116 113    
Total realized/unrealized gains (losses), Included in net income 0 0 0 0    
Total realized/unrealized gains (losses), Included in OCI 0 0 0 0    
Purchases 119 215 347 805    
Settlements (10) (6) (29) (32)    
Sales 0 0 0 0    
Transfers into Level 3 0 0 0 0    
Transfers out of Level 3 (15) (460) (270) (637)    
Ending balance 164 249 164 249    
Collateralized Loan Obligations [Member] | Fair Value Option, Other Eligible Items | Total Fixed Maturities, AFS            
Assets            
Beginning balance   160   167    
Total realized/unrealized gains (losses), Included in net income   (5)   (4)    
Total realized/unrealized gains (losses), Included in OCI   0   0    
Purchases   0   0    
Settlements   (3)   (11)    
Sales   0   0    
Transfers into Level 3   0   0    
Transfers out of Level 3   0   0    
Ending balance   152   152    
CMBS | Available-for-sale Securities [Member] | Total Fixed Maturities, AFS            
Assets            
Beginning balance 137 190 167 227    
Total realized/unrealized gains (losses), Included in net income 0 (2) (1) (4)    
Total realized/unrealized gains (losses), Included in OCI 2 3 6 15    
Purchases 0 0 0 0    
Settlements (8) (3) (21) (8)    
Sales 0 (10) (10) (58)    
Transfers into Level 3 2 28 45 34    
Transfers out of Level 3 0 0 (53) 0    
Ending balance 133 206 133 206    
Corporate | Available-for-sale Securities [Member] | Total Fixed Maturities, AFS            
Assets            
Beginning balance 2,734 2,061 2,281 1,861    
Total realized/unrealized gains (losses), Included in net income 0 0 3 0    
Total realized/unrealized gains (losses), Included in OCI 2 61 64 28    
Purchases 448 246 1,072 558    
Settlements (325) (107) (523) (183)    
Sales (12) (13) (88) (16)    
Transfers into Level 3 0 9 38 9    
Transfers out of Level 3 (12) 0 (12) 0    
Ending balance 2,835 2,257 2,835 2,257    
RMBS | Available-for-sale Securities [Member] | Total Fixed Maturities, AFS            
Assets            
Beginning balance 12 40 24 36    
Total realized/unrealized gains (losses), Included in net income 0 0 0 0    
Total realized/unrealized gains (losses), Included in OCI 0 0 0 0    
Purchases 13 33 37 85    
Settlements (2) (4) (9) (14)    
Sales 0 0 0 0    
Transfers into Level 3 0 0 0 0    
Transfers out of Level 3 0 (14) (29) (52)    
Ending balance $ 23 $ 55 $ 23 $ 55