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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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DEBT - 2026 Convertible Notes (Details)	3 Months Ended	12 Months Ended
DEBT - 2026 Convertible Notes (Details)	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) consecutive_trading_day trading_day $ / shares	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Principal amount		$ 1,000,000,000
Securitized debt net		$ 2,631,000,000	$ 2,680,000,000
Convertible debt, remaining discount amortization period		1 year
2026 Convertible Notes
Debt Instrument [Line Items]
Debt conversion, converted instrument, rate		100.00%
Securitized debt net		$ 449,000,000
Carrying amount of equity component, net of issuance costs		$ 126,000,000
Interest rate, effective percentage		0.00%
Convertible debt, remaining discount amortization period		4 years
Unamortized debt discount and issuance costs		$ (15,000,000)
2026 Convertible Notes \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days \| trading_day		20
Debt instrument, convertible, threshold consecutive trading days \| consecutive_trading_day		30
Debt instrument, convertible, threshold percentage of stock price trigger		130.00%
2026 Convertible Notes \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Debt instrument, convertible, threshold trading days \| trading_day		5
Debt instrument, convertible, threshold consecutive trading days \| consecutive_trading_day		5
Debt instrument, convertible, threshold percentage of stock price trigger		98.00%
2026 Convertible Notes \| Convertible Notes
Debt Instrument [Line Items]
Principal amount	$ 575,000,000
Debt, stated interest rate	0.00%
Proceeds from issuance of senior debt	$ 530,000,000
Conversion price (in usd per share) \| $ / shares		$ 169.83
Securitized debt net		$ 461,000,000	0
Carrying amount of equity component, net of issuance costs		117,000,000	0
Unamortized debt discount and issuance costs		$ (114,000,000)	$ 0