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DEBT - Schedule of Outstanding Debt (Details) - USD ($) | Mar. 31, 2023 | Dec. 31, 2022
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Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | $ 15,671,000,000 | $ 16,221,000,000
Principal amount outstanding | 11,196,000,000 | 12,245,000,000
Carrying value | 11,164,000,000 | 12,210,000,000
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Borrowing capacity increase under line of credit | 7,265,000,000 |
SMBC Funding Facility |  |
Debt Instrument [Line Items] |  |
Borrowing capacity increase under line of credit | 1,000,000,000.0 |
Line of Credit | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | 4,843,000,000 | 4,843,000,000
Principal amount outstanding | 1,872,000,000 | 2,246,000,000
Carrying value | 1,872,000,000 | 2,246,000,000
Line of Credit | Revolving Funding Facility |  |
Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | 1,775,000,000 | 1,775,000,000
Principal amount outstanding | 850,000,000 | 800,000,000
Carrying value | 850,000,000 | 800,000,000
Line of Credit | SMBC Funding Facility |  |
Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | 800,000,000 | 800,000,000
Principal amount outstanding | 401,000,000 | 451,000,000
Carrying value | 401,000,000 | 451,000,000
Line of Credit | BNP Funding Facility |  |
Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | 500,000,000 | 300,000,000
Principal amount outstanding | 320,000,000 | 245,000,000
Carrying value | 320,000,000 | 245,000,000
Convertible Debt | 2024 Convertible Notes |  |
Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | 403,000,000 | 403,000,000
Principal amount outstanding | 403,000,000 | 403,000,000
Carrying value | 400,000,000 | 399,000,000
Total unamortized debt issuance costs and unamortized discount | 3,000,000 | 4,000,000
Senior Notes | 2023 Notes |  |
Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | 0 | 750,000,000
Principal amount outstanding | 0 | 750,000,000
Carrying value | 0 | 750,000,000
Total unamortized debt issuance costs and unamortized discount |  | 0
Senior Notes | 2024 Notes |  |
Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | 900,000,000 | 900,000,000
Principal amount outstanding | 900,000,000 | 900,000,000
Carrying value | 899,000,000 | 898,000,000
Total unamortized debt issuance costs and unamortized discount | 1,000,000 | 2,000,000
Senior Notes | March 2025 Notes |  |
Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | 600,000,000 | 600,000,000
Principal amount outstanding | 600,000,000 | 600,000,000
Carrying value | 598,000,000 | 597,000,000
Total unamortized debt issuance costs and unamortized discount | 2,000,000 | 3,000,000
Senior Notes | July 2025 Notes |  |
Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | 1,250,000,000 | 1,250,000,000
Principal amount outstanding | 1,250,000,000 | 1,250,000,000
Carrying value | 1,257,000,000 | 1,258,000,000
Total unamortized debt issuance costs and unamortized discount | (7,000,000) | (8,000,000)
Senior Notes | January 2026 Notes |  |
Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | 1,150,000,000 | 1,150,000,000
Principal amount outstanding | 1,150,000,000 | 1,150,000,000
Carrying value | 1,145,000,000 | 1,144,000,000
Total unamortized debt issuance costs and unamortized discount | 5,000,000 | 6,000,000
Senior Notes | July 2026 Notes |  |
Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | 1,000,000,000 | 1,000,000,000
Principal amount outstanding | 1,000,000,000 | 1,000,000,000
Carrying value | 991,000,000 | 991,000,000
Total unamortized debt issuance costs and unamortized discount | 9,000,000 | 9,000,000
Senior Notes | 2027 Notes |  |
Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | 500,000,000 | 500,000,000
Principal amount outstanding | 500,000,000 | 500,000,000
Carrying value | 494,000,000 | 494,000,000
Total unamortized debt issuance costs and unamortized discount | 6,000,000 | 6,000,000
Senior Notes | 2028 Notes |  |
Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | 1,250,000,000 | 1,250,000,000
Principal amount outstanding | 1,250,000,000 | 1,250,000,000
Carrying value | 1,247,000,000 | 1,247,000,000
Total unamortized debt issuance costs and unamortized discount | 3,000,000 | 3,000,000
Senior Notes | 2031 Notes |  |
Debt Instrument [Line Items] |  |
Total aggregate principal amount committed / outstanding | 700,000,000 | 700,000,000
Principal amount outstanding | 700,000,000 | 700,000,000
Carrying value | 690,000,000 | 690,000,000
Total unamortized debt issuance costs and unamortized discount | $ 10,000,000 | $ 10,000,000

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