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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Valuation Techniques and Unobservable Inputs of Level 3 Fair Value Measurements (Details) - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023
Fair Value Disclosures [Abstract] |  |  |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net income (loss) | Net income (loss) | Net income (loss) | Net income (loss)
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) | Other comprehensive income (loss) |  | Other comprehensive income (loss)
Policyholders’ account balances – embedded derivative |  |  |  |
Liabilities |  |  |  |
Beginning balance | $ (904) | $ (872) |  |
Funds withheld for reinsurance liabilities – embedded derivative, beginning balance |  |  | $ (784) | $ (726)
Acquisition from business combination | 0 |  |  |
Derecognition | 0 |  |  |
Fair value changes in net income | (287) | (38) | (51) | (50)
Fair value changes in other comprehensive income | 0 | 0 |  | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements or maturities | (30) | 0 | 0 | 0
Premiums less benefits | 35 | (6) | 26 | (8)
Transfers into Level 3 | 0 |  |  |
Transfers out of Level 3 | 0 |  |  |
Ending balance | (1,196) | (904) |  |
Funds withheld for reinsurance liabilities – embedded derivative, ending balance |  |  | (809) | (784)
Funds withheld for reinsurance liabilities – embedded derivative |  |  |  |
Liabilities |  |  |  |
Funds withheld for reinsurance liabilities – embedded derivative, beginning balance | 1 | 0 |  |
Acquisition from business combination | 0 |  |  |
Derecognition | 0 |  |  |
Fair value changes in net income | (35) | 1 |  |
Fair value changes in other comprehensive income | 0 | 0 |  |
Purchases | 0 | 0 |  |
Sales | 0 | 0 |  |
Settlements or maturities | 0 | 0 |  |
Premiums less benefits | 0 | 0 |  |
Transfers into Level 3 | 0 |  |  |
Transfers out of Level 3 | 0 |  |  |
Funds withheld for reinsurance liabilities – embedded derivative, ending balance | (34) | 1 |  |
Invested assets |  |  |  |
Assets |  |  |  |
Beginning balance | 4,575 | 4,447 | 3,512 | 2,489
Acquisition from business combination | 4,288 |  |  |
Derecognition | 0 |  |  |
Fair value changes in net income | 162 | (5) | (293) | 1
Fair value changes in other comprehensive income | 19 | 8 |  | 77
Purchases | 1,234 | 2,187 | 923 | 1,265
Sales | (1,260) | (2,056) | (33) | (320)
Settlements or maturities | (3) | (6) | 0 | 0
Premiums less benefits | 0 | 0 | 0 | 0
Transfers into Level 3 | 64 |  |  |
Transfers out of Level 3 | (58) |  |  |
Ending balance | 9,021 | 4,575 | 4,109 | 3,512
Derivative assets |  |  |  |
Assets |  |  |  |
Beginning balance | 257 | 227 | 167 | 121
Acquisition from business combination | 0 |  |  |
Derecognition | 0 |  |  |
Fair value changes in net income | 24 | 57 | 47 | 25
Fair value changes in other comprehensive income | 0 | 0 |  | 0
Purchases | 39 | 35 | 30 | 30
Sales | 0 | 0 | 0 | 0
Settlements or maturities | (66) | (62) | (29) | (9)
Premiums less benefits | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 |  |  |
Transfers out of Level 3 | 0 |  |  |
Ending balance | 254 | 257 | 215 | 167
Reinsurance funds withheld – embedded derivative |  |  |  |
Assets |  |  |  |
Beginning balance | 89 | (46) | 99 | 154
Acquisition from business combination | 0 |  |  |
Derecognition | (196) |  |  |
Fair value changes in net income | 141 | 135 | 27 | (55)
Fair value changes in other comprehensive income | 0 | 0 |  | 0
Purchases | 0 | 0 | 0 | 0
Sales | 0 | 0 | 0 | 0
Settlements or maturities | 0 | 0 | 0 | 0
Premiums less benefits | 0 | 0 | 0 | 0
Transfers into Level 3 | 0 |  |  |
Transfers out of Level 3 | 0 |  |  |
Ending balance | $ 34 | $ 89 | $ 126 | $ 99

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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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