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Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 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, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Beginning balance | $ 2,487 | $ 2,483
Total realized/unrealized gains (losses), Included in net income | 3 | (8)
Total realized/unrealized gains (losses), Included in OCI | (5) | 26
Purchases | 291 | 148
Settlements | (49) | (69)
Sales | (2) | (7)
Transfers into Level 3 | 6 | 37
Transfers out of Level 3 | (47) | (73)
Ending balance | 2,684 | 2,537
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity securities, at fair value |  |
Assets |  |
Beginning balance | 58 | 61
Total realized/unrealized gains (losses), Included in net income | 0 | (1)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 1
Settlements | 0 | (1)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 58 | 60
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Short-term investments |  |
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 | 1 | 1
Settlements | 0 | (7)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 26 | 187
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Total Fixed Maturities, AFS |  |
Assets |  |
Beginning balance | 2,237 | 2,051
Total realized/unrealized gains (losses), Included in net income | 0 | 1
Total realized/unrealized gains (losses), Included in OCI | (5) | 26
Purchases | 290 | 146
Settlements | (46) | (63)
Sales | (2) | (7)
Transfers into Level 3 | 6 | 37
Transfers out of Level 3 | (47) | (73)
Ending balance | 2,433 | 2,118
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | ABS | Total Fixed Maturities, AFS |  |
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 | 16 | 36
Settlements | 0 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (30)
Ending balance | 16 | 36
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 | 113 | 115
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 130 | 40
Settlements | (12) | (4)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (47) | 0
Ending balance | 184 | 151
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | CMBS | Total Fixed Maturities, AFS |  |
Assets |  |
Beginning balance | 227 | 222
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 10 | (5)
Purchases | 0 | 4
Settlements | (2) | 0
Sales | 0 | 0
Transfers into Level 3 | 6 | 10
Transfers out of Level 3 | 0 | 0
Ending balance | 241 | 231
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | Corporate | Total Fixed Maturities, AFS |  |
Assets |  |
Beginning balance | 1,861 | 1,589
Total realized/unrealized gains (losses), Included in net income | 0 | 1
Total realized/unrealized gains (losses), Included in OCI | (15) | 31
Purchases | 106 | 66
Settlements | (27) | (51)
Sales | (2) | (7)
Transfers into Level 3 | 0 | 27
Transfers out of Level 3 | 0 | (13)
Ending balance | 1,923 | 1,643
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Securities available-for-sale and other | RMBS | Total Fixed Maturities, AFS |  |
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 | 38 | 0
Settlements | (5) | (8)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (30)
Ending balance | 69 | 57
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 | 178
Total realized/unrealized gains (losses), Included in net income | 3 | (8)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 0
Settlements | (3) | 2
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | $ 167 | $ 172

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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