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Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Assets |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net realized gains (losses) | Net realized gains (losses)
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
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring |  |
Assets |  |
Beginning balance | $ 2,708 | $ 1,805
Total realized/unrealized gains (losses), Included in net income | (14) | 50
Total realized/unrealized gains (losses), Included in OCI | (205) | (38)
Purchases | 1,215 | 2,145
Settlements | (591) | (570)
Sales | (47) | (72)
Transfers into Level 3 | 48 | 177
Transfers out of Level 3 | (631) | (789)
Ending balance | 2,483 | 2,708
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Equity Securities [Member] |  |
Assets |  |
Beginning balance | 64 | 70
Total realized/unrealized gains (losses), Included in net income | 11 | 42
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 2 | 6
Settlements | (16) | (53)
Sales | 0 | (1)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 61 | 64
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Short-term Investments [Member] |  |
Assets |  |
Beginning balance | 80 | 30
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 284 | 98
Settlements | (121) | (48)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (50) | 0
Ending balance | 193 | 80
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Securities available-for-sale and other | Total fixed maturities |  |
Assets |  |
Beginning balance | 2,404 | 1,705
Total realized/unrealized gains (losses), Included in net income | (1) | 14
Total realized/unrealized gains (losses), Included in OCI | (205) | (38)
Purchases | 874 | 1,881
Settlements | (441) | (475)
Sales | (47) | (71)
Transfers into Level 3 | 48 | 177
Transfers out of Level 3 | (581) | (789)
Ending balance | 2,051 | 2,404
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Securities available-for-sale and other | ABS | Total fixed maturities |  |
Assets |  |
Beginning balance | 0 | 0
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 49 | 42
Settlements | 0 | 0
Sales | 0 | (3)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (19) | (39)
Ending balance | 30 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Securities available-for-sale and other | CLO | Total fixed maturities |  |
Assets |  |
Beginning balance | 257 | 360
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | (2) | (1)
Purchases | 113 | 471
Settlements | (62) | (124)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (191) | (449)
Ending balance | 115 | 257
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Securities available-for-sale and other | CMBS | Total fixed maturities |  |
Assets |  |
Beginning balance | 196 | 77
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | (15) | 1
Purchases | 51 | 166
Settlements | (10) | (4)
Sales | 0 | (1)
Transfers into Level 3 | 0 | 5
Transfers out of Level 3 | 0 | (48)
Ending balance | 222 | 196
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Securities available-for-sale and other | Corporate | Total fixed maturities |  |
Assets |  |
Beginning balance | 1,618 | 881
Total realized/unrealized gains (losses), Included in net income | 0 | 14
Total realized/unrealized gains (losses), Included in OCI | (174) | (34)
Purchases | 524 | 828
Settlements | (274) | (154)
Sales | (40) | (47)
Transfers into Level 3 | 45 | 172
Transfers out of Level 3 | (110) | (42)
Ending balance | 1,589 | 1,618
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Securities available-for-sale and other | Foreign government/government agencies | Total fixed maturities |  |
Assets |  |
Beginning balance | 5 | 6
Total realized/unrealized gains (losses), Included in net income | (1) | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 5
Settlements | 0 | 0
Sales | (7) | (6)
Transfers into Level 3 | 3 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 0 | 5
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Securities available-for-sale and other | Residential mortgage-backed securities ("RMBS") | Total fixed maturities |  |
Assets |  |
Beginning balance | 328 | 381
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | (14) | (4)
Purchases | 137 | 369
Settlements | (95) | (193)
Sales | 0 | (14)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (261) | (211)
Ending balance | 95 | 328
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Fair Value Option, Other Eligible Items | CLO | Total fixed maturities |  |
Assets |  |
Beginning balance | 160 | 0
Total realized/unrealized gains (losses), Included in net income | (24) | (6)
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 55 | 160
Settlements | (13) | 6
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | $ 178 | $ 160

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