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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 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 Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent
Fair Value, Measurements, Recurring | Significant
Unobservable
Inputs
(Level 3)        
Assets        
Beginning balance $ 2,684 $ 2,537 $ 2,487 $ 2,483
Total realized/unrealized gains (losses), Included in net income (4) (10) (1) (18)
Total realized/unrealized gains (losses), Included in OCI (16) 4 (21) 30
Purchases 680 75 971 223
Settlements (77) (72) (126) (141)
Sales (49) (7) (51) (14)
Transfers into Level 3 0 10 6 47
Transfers out of Level 3 (176) (115) (223) (188)
Ending balance 3,042 2,422 3,042 2,422
Fair Value, Measurements, Recurring | Significant
Unobservable
Inputs
(Level 3) | Equity securities, at fair value        
Assets        
Beginning balance 58 60 58 61
Total realized/unrealized gains (losses), Included in net income 0 (1) 0 (2)
Total realized/unrealized gains (losses), Included in OCI 0 0 0 0
Purchases 0 0 0 1
Settlements 0 0 0 (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 58 59 58 59
Fair Value, Measurements, Recurring | Significant
Unobservable
Inputs
(Level 3) | Short-term investments        
Assets        
Beginning balance 26 187 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 0 3 1 4
Settlements (1) (4) (1) (11)
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance 25 186 25 186
Fair Value, Measurements, Recurring | Significant
Unobservable
Inputs
(Level 3) | Securities available-for-sale and other | Total Fixed Maturities, AFS        
Assets        
Beginning balance 2,433 2,118 2,237 2,051
Total realized/unrealized gains (losses), Included in net income (2) (4) (2) (3)
Total realized/unrealized gains (losses), Included in OCI (16) 4 (21) 30
Purchases 680 72 970 218
Settlements (71) (64) (117) (127)
Sales (49) (7) (51) (14)
Transfers into Level 3 0 10 6 47
Transfers out of Level 3 (176) (115) (223) (188)
Ending balance 2,799 2,014 2,799 2,014
Fair Value, Measurements, Recurring | Significant
Unobservable
Inputs
(Level 3) | Securities available-for-sale and other | ABS | Total Fixed Maturities, AFS        
Assets        
Beginning balance 16 36 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 0 0 16 36
Settlements 0 0 0 0
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (8) (36) (8) (66)
Ending balance 8 0 8 0
Fair Value, Measurements, Recurring | Significant
Unobservable
Inputs
(Level 3) | Securities available-for-sale and other | Collateralized Loan Obligations [Member] | Total Fixed Maturities, AFS        
Assets        
Beginning balance 184 151 113 115
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 460 0 590 40
Settlements (14) (26) (26) (30)
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (130) (40) (177) (40)
Ending balance 500 85 500 85
Fair Value, Measurements, Recurring | Significant
Unobservable
Inputs
(Level 3) | Securities available-for-sale and other | CMBS | Total Fixed Maturities, AFS        
Assets        
Beginning balance 241 231 227 222
Total realized/unrealized gains (losses), Included in net income (2) (2) (2) (2)
Total realized/unrealized gains (losses), Included in OCI 2 7 12 2
Purchases 0 2 0 6
Settlements (3) (1) (5) (1)
Sales (48) (5) (48) (5)
Transfers into Level 3 0 6 6 16
Transfers out of Level 3 0 0 0 0
Ending balance 190 238 190 238
Fair Value, Measurements, Recurring | Significant
Unobservable
Inputs
(Level 3) | Securities available-for-sale and other | Corporate | Total Fixed Maturities, AFS        
Assets        
Beginning balance 1,923 1,643 1,861 1,589
Total realized/unrealized gains (losses), Included in net income 0 (2) 0 (1)
Total realized/unrealized gains (losses), Included in OCI (18) (3) (33) 28
Purchases 206 51 312 117
Settlements (49) (30) (76) (81)
Sales (1) (2) (3) (9)
Transfers into Level 3 0 4 0 31
Transfers out of Level 3 0 (39) 0 (52)
Ending balance 2,061 1,622 2,061 1,622
Fair Value, Measurements, Recurring | Significant
Unobservable
Inputs
(Level 3) | Securities available-for-sale and other | RMBS | Total Fixed Maturities, AFS        
Assets        
Beginning balance 69 57 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 14 19 52 19
Settlements (5) (7) (10) (15)
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (38) 0 (38) (30)
Ending balance 40 69 40 69
Fair Value, Measurements, Recurring | Significant
Unobservable
Inputs
(Level 3) | Fair Value Option, Other Eligible Items | Collateralized Loan Obligations [Member] | Total Fixed Maturities, AFS        
Assets        
Beginning balance 167 172 167 178
Total realized/unrealized gains (losses), Included in net income (2) (5) 1 (13)
Total realized/unrealized gains (losses), Included in OCI 0 0 0 0
Purchases 0 0 0 0
Settlements (5) (4) (8) (2)
Sales 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Ending balance $ 160 $ 163 $ 160 $ 163