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Fair Value Measurements - Fair Value Recurring Basis, Unobservable Input (Details) - Fair Value, Measurements, Recurring - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Assets |  |
Beginning balance | $ 2,708 | $ 1,805
Total realized/unrealized gains (losses), Included in net income | 7 | 5
Total realized/unrealized gains (losses), Included in OCI | (71) | (14)
Purchases | 339 | 371
Settlements | (146) | (84)
Sales | (8) | (17)
Transfers into Level 3 | 0 | 48
Transfers out of Level 3 | (277) | (110)
Ending balance | 2,552 | 2,004
Equity securities, at fair value |  |
Assets |  |
Beginning balance | 64 | 70
Total realized/unrealized gains (losses), Included in net income | 7 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 0
Settlements | (14) | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 57 | 70
Short-term investments |  |
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 | 4 | 0
Settlements | (2) | (14)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (50) | 0
Ending balance | 32 | 16
Securities available-for-sale and other | Total Fixed Maturities, AFS |  |
Assets |  |
Beginning balance | 2,404 | 1,705
Total realized/unrealized gains (losses), Included in net income | (2) | 5
Total realized/unrealized gains (losses), Included in OCI | (71) | (14)
Purchases | 315 | 371
Settlements | (122) | (70)
Sales | (8) | (17)
Transfers into Level 3 | 0 | 48
Transfers out of Level 3 | (227) | (110)
Ending balance | 2,289 | 1,918
Securities available-for-sale and other | ABS | Total Fixed Maturities, AFS |  |
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 | 19 | 6
Settlements | 0 | 0
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 19 | 6
Securities available-for-sale and other | Collateralized Loan Obligations [Member] | Total Fixed Maturities, AFS |  |
Assets |  |
Beginning balance | 257 | 360
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | (1) | 0
Purchases | 54 | 140
Settlements | (17) | (15)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (79) | (59)
Ending balance | 214 | 426
Securities available-for-sale and other | CMBS | Total Fixed Maturities, AFS |  |
Assets |  |
Beginning balance | 196 | 77
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | (5) | 0
Purchases | 46 | 1
Settlements | (1) | (2)
Sales | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | (15)
Ending balance | 236 | 61
Securities available-for-sale and other | Corporate | Total Fixed Maturities, AFS |  |
Assets |  |
Beginning balance | 1,618 | 881
Total realized/unrealized gains (losses), Included in net income | (2) | 5
Total realized/unrealized gains (losses), Included in OCI | (59) | (13)
Purchases | 59 | 73
Settlements | (70) | (7)
Sales | (7) | (7)
Transfers into Level 3 | 0 | 48
Transfers out of Level 3 | (24) | (36)
Ending balance | 1,515 | 944
Securities available-for-sale and other | Foreign government/government agencies | Total Fixed Maturities, AFS |  |
Assets |  |
Beginning balance | 5 | 6
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | 0 | 0
Purchases | 0 | 0
Settlements | 0 | 0
Sales | (1) | (6)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Ending balance | 4 | 0
Securities available-for-sale and other | RMBS | Total Fixed Maturities, AFS |  |
Assets |  |
Beginning balance | 328 | 381
Total realized/unrealized gains (losses), Included in net income | 0 | 0
Total realized/unrealized gains (losses), Included in OCI | (6) | (1)
Purchases | 137 | 151
Settlements | (34) | (46)
Sales | 0 | (4)
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | (124) | 0
Ending balance | 301 | $ 481
Fair Value Option, Other Eligible Items | Collateralized Loan Obligations [Member] | Total Fixed Maturities, AFS |  |
Assets |  |
Beginning balance | 160 |
Total realized/unrealized gains (losses), Included in net income | 2 |
Total realized/unrealized gains (losses), Included in OCI | 0 |
Purchases | 20 |
Settlements | (8) |
Sales | 0 |
Transfers into Level 3 | 0 |
Transfers out of Level 3 | 0 |
Ending balance | $ 174 |

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