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Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Liabilities        
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
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized losses Net realized losses Net realized losses Net realized losses
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring        
Assets        
Beginning balance $ 3,224 $ 2,684 $ 2,992 $ 2,487
Total realized/unrealized gains (losses), Included in net income (12) (4) (16) (1)
Total realized/unrealized gains (losses), Included in OCI 48 (16) 67 (21)
Purchases 580 680 1,034 971
Settlements (149) (77) (300) (126)
Sales (75) (49) (86) (51)
Transfers into Level 3 8 0 81 6
Transfers out of Level 3 (189) (176) (337) (223)
Ending balance 3,435 3,042 3,435 3,042
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | Equity securities, at fair value        
Assets        
Beginning balance 91 58 87 58
Total realized/unrealized gains (losses), Included in net income 0 0 (1) 0
Total realized/unrealized gains (losses), Included in OCI 0 0 0 0
Purchases 2 0 10 0
Settlements 0 0 (3) 0
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance 93 58 93 58
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | Short-term investments        
Assets        
Beginning balance 59 26 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 57 0 67 1
Settlements 0 (1) (49) (1)
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance 116 25 116 25
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | Available-for-sale Securities [Member] | Total Fixed Maturities, AFS        
Assets        
Beginning balance 2,879 2,433 2,610 2,237
Total realized/unrealized gains (losses), Included in net income 1 (2) 2 (2)
Total realized/unrealized gains (losses), Included in OCI 48 (16) 67 (21)
Purchases 519 680 949 970
Settlements (146) (71) (241) (117)
Sales (75) (49) (86) (51)
Transfers into Level 3 8 0 81 6
Transfers out of Level 3 (189) (176) (337) (223)
Ending balance 3,045 2,799 3,045 2,799
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | Fair Value Option, Other Eligible Items | Total Fixed Maturities, AFS        
Assets        
Beginning balance 195   197  
Total realized/unrealized gains (losses), Included in net income (13)   (17)  
Total realized/unrealized gains (losses), Included in OCI 0   0  
Purchases 2   8  
Settlements (3)   (7)  
Sales 0   0  
Transfers into Level 3 0   0  
Transfers out of Level 3 0   0  
Ending balance 181   181  
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | ABS | Available-for-sale Securities [Member] | Total Fixed Maturities, AFS        
Assets        
Beginning balance 56 16 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 39 0 73 16
Settlements (3) 0 (4) 0
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 (8) 0 (8)
Ending balance 92 8 92 8
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | Collateralized Loan Obligations [Member] | Available-for-sale Securities [Member] | Total Fixed Maturities, AFS        
Assets        
Beginning balance 233 184 116 113
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 20 460 228 590
Settlements (18) (14) (19) (26)
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (165) (130) (255) (177)
Ending balance 70 500 70 500
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | Collateralized Loan Obligations [Member] | Fair Value Option, Other Eligible Items | Total Fixed Maturities, AFS        
Assets        
Beginning balance   167   167
Total realized/unrealized gains (losses), Included in net income   (2)   1
Total realized/unrealized gains (losses), Included in OCI   0   0
Purchases   0   0
Settlements   (5)   (8)
Sales   0   0
Transfers into Level 3   0   0
Transfers out of Level 3   0   0
Ending balance   160   160
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | CMBS | Available-for-sale Securities [Member] | Total Fixed Maturities, AFS        
Assets        
Beginning balance 150 241 167 227
Total realized/unrealized gains (losses), Included in net income (1) (2) (1) (2)
Total realized/unrealized gains (losses), Included in OCI 1 2 4 12
Purchases 0 0 0 0
Settlements (13) (3) (13) (5)
Sales (8) (48) (10) (48)
Transfers into Level 3 8 0 43 6
Transfers out of Level 3 0 0 (53) 0
Ending balance 137 190 137 190
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | Corporate | Available-for-sale Securities [Member] | Total Fixed Maturities, AFS        
Assets        
Beginning balance 2,401 1,923 2,281 1,861
Total realized/unrealized gains (losses), Included in net income 2 0 3 0
Total realized/unrealized gains (losses), Included in OCI 47 (18) 62 (33)
Purchases 460 206 624 312
Settlements (109) (49) (198) (76)
Sales (67) (1) (76) (3)
Transfers into Level 3 0 0 38 0
Transfers out of Level 3 0 0 0 0
Ending balance 2,734 2,061 2,734 2,061
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | RMBS | Available-for-sale Securities [Member] | Total Fixed Maturities, AFS        
Assets        
Beginning balance 39 69 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 0 14 24 52
Settlements (3) (5) (7) (10)
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (24) (38) (29) (38)
Ending balance $ 12 $ 40 $ 12 $ 40