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Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Assets    
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
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized losses Net realized losses
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
Assets    
Beginning balance $ 2,487 $ 2,483
Total realized/unrealized gains (losses), Included in net income (10) (9)
Total realized/unrealized gains (losses), Included in OCI (5) 74
Purchases 2,201 737
Settlements (514) (521)
Sales (196) (16)
Transfers into Level 3 48 71
Transfers out of Level 3 (1,019) (332)
Ending balance 2,992 2,487
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Equity Securities [Member]    
Assets    
Beginning balance 58 61
Total realized/unrealized gains (losses), Included in net income 3 (1)
Total realized/unrealized gains (losses), Included in OCI 0 0
Purchases 49 1
Settlements (20) (3)
Sales (3) 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending balance 87 58
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Short-term Investments [Member]    
Assets    
Beginning balance 25 193
Total realized/unrealized gains (losses), Included in net income 0 0
Total realized/unrealized gains (losses), Included in OCI 0 0
Purchases 145 48
Settlements (72) (216)
Sales 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending balance 98 25
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Securities available-for-sale and other | Total fixed maturities    
Assets    
Beginning balance 2,237 2,051
Total realized/unrealized gains (losses), Included in net income (6) (7)
Total realized/unrealized gains (losses), Included in OCI (5) 74
Purchases 1,955 688
Settlements (407) (292)
Sales (193) (16)
Transfers into Level 3 48 71
Transfers out of Level 3 (1,019) (332)
Ending balance 2,610 2,237
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Fair Value Option, Other Eligible Items | Total fixed maturities    
Assets    
Beginning balance 167  
Total realized/unrealized gains (losses), Included in net income (7)  
Total realized/unrealized gains (losses), Included in OCI 0  
Purchases 52  
Settlements (15)  
Sales 0  
Transfers into Level 3 0  
Transfers out of Level 3 0  
Ending balance 197 167
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | ABS | Securities available-for-sale and other | Total fixed maturities    
Assets    
Beginning balance 0 30
Total realized/unrealized gains (losses), Included in net income 0 0
Total realized/unrealized gains (losses), Included in OCI 0 0
Purchases 70 82
Settlements 0 0
Sales 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 (48) (112)
Ending balance 22 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Collateralized Loan Obligations [Member] | Securities available-for-sale and other | Total fixed maturities    
Assets    
Beginning balance 113 115
Total realized/unrealized gains (losses), Included in net income 0 0
Total realized/unrealized gains (losses), Included in OCI 0 0
Purchases 919 102
Settlements (64) (49)
Sales 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 (852) (55)
Ending balance 116 113
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Collateralized Loan Obligations [Member] | Fair Value Option, Other Eligible Items | Total fixed maturities    
Assets    
Beginning balance 167 178
Total realized/unrealized gains (losses), Included in net income   (1)
Total realized/unrealized gains (losses), Included in OCI   0
Purchases   0
Settlements   (10)
Sales   0
Transfers into Level 3   0
Transfers out of Level 3   0
Ending balance   167
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS | Securities available-for-sale and other | Total fixed maturities    
Assets    
Beginning balance 227 222
Total realized/unrealized gains (losses), Included in net income (6) (2)
Total realized/unrealized gains (losses), Included in OCI 18 3
Purchases 0 6
Settlements (10) (18)
Sales (67) (5)
Transfers into Level 3 39 21
Transfers out of Level 3 (34) 0
Ending balance 167 227
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate | Securities available-for-sale and other | Total fixed maturities    
Assets    
Beginning balance 1,861 1,589
Total realized/unrealized gains (losses), Included in net income 0 (5)
Total realized/unrealized gains (losses), Included in OCI (23) 71
Purchases 876 458
Settlements (316) (196)
Sales (126) (11)
Transfers into Level 3 9 50
Transfers out of Level 3 0 (95)
Ending balance 2,281 1,861
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") | Securities available-for-sale and other | Total fixed maturities    
Assets    
Beginning balance 36 95
Total realized/unrealized gains (losses), Included in net income 0 0
Total realized/unrealized gains (losses), Included in OCI 0 0
Purchases 90 40
Settlements (17) (29)
Sales 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 (85) (70)
Ending balance $ 24 $ 36