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Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
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
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring        
Assets        
Beginning balance $ 3,042 $ 2,422 $ 2,487 $ 2,483
Total realized/unrealized gains (losses), Included in net income (3) 9 (4) (9)
Total realized/unrealized gains (losses), Included in OCI 64 (23) 43 7
Purchases 556 197 1,527 420
Settlements (143) (100) (269) (241)
Sales (26) (1) (77) (15)
Transfers into Level 3 37 20 43 67
Transfers out of Level 3 (474) (20) (697) (208)
Ending balance 3,053 2,504 3,053 2,504
Liabilities        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs, Beginning Balance 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  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 0   0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers, Net 0   0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 0   0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs, Ending Balance (5)   (5)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Beginning Balance 0   0  
Changes in Unrealized Gain/(Loss) Included in Net Income, Liabilities 0   0  
Total realized/unrealized gains (losses), Included in OCI 0   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases (5)   (5)  
Settlements 0   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales 0   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 0   0  
Transfers out of Level 3 0   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value, Ending Balance (5)   (5)  
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | Equity        
Liabilities        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs, Beginning Balance 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  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 0   0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers, Net 0   0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 0   0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs, Ending Balance (5)   (5)  
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | Equity securities, at fair value        
Assets        
Beginning balance 58 59 58 61
Total realized/unrealized gains (losses), Included in net income 4 0 4 (2)
Total realized/unrealized gains (losses), Included in OCI 0 0 0 0
Purchases 19 0 19 1
Settlements (1) (1) (1) (2)
Sales (3) 0 (3) 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance 77 58 77 58
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | Short-term investments        
Assets        
Beginning balance 25 186 25 193
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 3 2 4 6
Settlements (19) (3) (20) (14)
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance 9 185 9 185
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | Securities available-for-sale and other | Total Fixed Maturities, AFS        
Assets        
Beginning balance 2,799 2,014 2,237 2,051
Total realized/unrealized gains (losses), Included in net income (2) (4) (4) (7)
Total realized/unrealized gains (losses), Included in OCI 64 (23) 43 7
Purchases 534 195 1,504 413
Settlements (120) (93) (237) (220)
Sales (23) (1) (74) (15)
Transfers into Level 3 37 20 43 67
Transfers out of Level 3 (474) (20) (697) (208)
Ending balance 2,815 2,088 2,815 2,088
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | ABS | Securities available-for-sale and other | Total Fixed Maturities, AFS        
Assets        
Beginning balance 8 0 0 30
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 40 46 56 82
Settlements 0 0 0 0
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 (8) (66)
Ending balance 48 46 48 46
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | Collateralized Loan Obligations [Member] | Securities available-for-sale and other | Total Fixed Maturities, AFS        
Assets        
Beginning balance 500 85 113 115
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 215 15 805 55
Settlements (6) (3) (32) (33)
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (460) 0 (637) (40)
Ending balance 249 97 249 97
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 160 163 167 178
Total realized/unrealized gains (losses), Included in net income (5) 13 (4) 0
Total realized/unrealized gains (losses), Included in OCI 0 0 0 0
Purchases 0 0 0 0
Settlements (3) (3) (11) (5)
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance 152 173 152 173
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | CMBS | Securities available-for-sale and other | Total Fixed Maturities, AFS        
Assets        
Beginning balance 190 238 227 222
Total realized/unrealized gains (losses), Included in net income (2) 0 (4) (2)
Total realized/unrealized gains (losses), Included in OCI 3 1 15 3
Purchases 0 0 0 6
Settlements (3) (14) (8) (15)
Sales (10) 0 (58) (5)
Transfers into Level 3 28 1 34 17
Transfers out of Level 3 0 0 0 0
Ending balance 206 226 206 226
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | Corporate | Securities available-for-sale and other | Total Fixed Maturities, AFS        
Assets        
Beginning balance 2,061 1,622 1,861 1,589
Total realized/unrealized gains (losses), Included in net income 0 (4) 0 (5)
Total realized/unrealized gains (losses), Included in OCI 61 (24) 28 4
Purchases 246 113 558 230
Settlements (107) (69) (183) (150)
Sales (13) (1) (16) (10)
Transfers into Level 3 9 19 9 50
Transfers out of Level 3 0 (1) 0 (53)
Ending balance 2,257 1,655 2,257 1,655
Significant
Unobservable
Inputs
(Level 3) | Fair Value, Measurements, Recurring | RMBS | Securities available-for-sale and other | Total Fixed Maturities, AFS        
Assets        
Beginning balance 40 69 36 95
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 33 21 85 40
Settlements (4) (7) (14) (22)
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (14) (19) (52) (49)
Ending balance $ 55 $ 64 $ 55 $ 64