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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Changes in Investments that use Level 3 Inputs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at the beginning | $ 20,683 | $ 19,375 | $ 21,361 | $ 19,908
Purchases | 1,167 | 2,817 | 2,239 | 4,671
Sales | (160) | (659) | (857) | (2,206)
Repayments | (932) | (434) | (1,995) | (1,406)
PIK interest and dividends | 100 | 80 | 181 | 147
Net accretion of discount on securities | 2 | 2 | 6 | 5
Net transfers in and/or out of Level 3 | (129) | 0 | (173) | 0
Balance at the end | 20,757 | 21,012 | 20,757 | 21,012
Debt and Equity Securities, Realized Gain (Loss) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net realized and unrealized gains (losses) | $ (68) | $ (24) | $ (88) | $ 45
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): | Net realized gains (losses): | Net realized gains (losses):
Debt and Equity Securities, Unrealized Gain (Loss) |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Net realized and unrealized gains (losses) | $ 94 | $ (145) | $ 83 | $ (152)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net unrealized gains (losses): | Net unrealized gains (losses): | Net unrealized gains (losses): | Net unrealized gains (losses):

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, PIK Interest And Dividends + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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