CREDIT FACILITIES AND LONG-TERM DEBT - Summary of Credit Facilities and Long-Term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Line of Credit
Debt Instrument [Line Items]
Borrowing Capacity	$ 11,300
Net Carrying Amount	3,176	$ 1,862
Outstanding, current	3,362	4,240
Line of Credit | Asset-backed Senior Revolving Credit Facilities
Debt Instrument [Line Items]
Borrowing Capacity	7,800
Outstanding amount, current	3,362	4,240
Outstanding amount, noncurrent	1,650	900
Issuance costs	(16)	(3)
Net Carrying Amount	1,634	897
Line of Credit | Asset-backed Mezzanine Term Debt Facilities
Debt Instrument [Line Items]
Borrowing Capacity	3,500
Outstanding amount, current	0	0
Outstanding amount, noncurrent	1,575	1,000
Issuance costs	(33)	(35)
Net Carrying Amount	1,542	965
Secured Debt
Debt Instrument [Line Items]
Borrowing Capacity	100
Net Carrying Amount	0	0
Outstanding, current	12	7
Secured Debt | Repo Facility 2019-R1
Debt Instrument [Line Items]
Borrowing Capacity	100
Outstanding amount, current	12	7
Outstanding amount, noncurrent	$ 0	$ 0
Weighted average interest rate (in percent)	2.43%	1.84%
Revolving Facility 2018-2 | Line of Credit | Asset-backed Senior Revolving Credit Facilities
Debt Instrument [Line Items]
Borrowing Capacity	$ 1,000
Outstanding amount, current	104	$ 759
Outstanding amount, noncurrent	$ 0	$ 0
Weighted average interest rate (in percent)	3.07%	2.84%
Revolving Facility 2018-3 | Line of Credit | Asset-backed Senior Revolving Credit Facilities
Debt Instrument [Line Items]
Borrowing Capacity	$ 750
Outstanding amount, current	271	$ 673
Outstanding amount, noncurrent	$ 0	$ 0
Weighted average interest rate (in percent)	2.62%	2.39%
Revolving Facility 2019-1 | Line of Credit | Asset-backed Senior Revolving Credit Facilities
Debt Instrument [Line Items]
Borrowing Capacity	$ 900
Outstanding amount, current	876	$ 648
Outstanding amount, noncurrent	$ 0	$ 0
Weighted average interest rate (in percent)	3.43%	2.84%
Revolving Facility 2019-2 | Line of Credit | Asset-backed Senior Revolving Credit Facilities
Debt Instrument [Line Items]
Borrowing Capacity	$ 1,850
Outstanding amount, current	1,809	$ 1,149
Outstanding amount, noncurrent	$ 0	$ 0
Weighted average interest rate (in percent)	2.89%	2.52%
Revolving Facility 2019-3 | Line of Credit | Asset-backed Senior Revolving Credit Facilities
Debt Instrument [Line Items]
Borrowing Capacity	$ 925
Outstanding amount, current	252	$ 886
Outstanding amount, noncurrent	$ 0	$ 0
Weighted average interest rate (in percent)	3.42%	3.25%
Revolving Facility 2021-1 | Line of Credit | Asset-backed Senior Revolving Credit Facilities
Debt Instrument [Line Items]
Borrowing Capacity	$ 125
Outstanding amount, current	50	$ 125
Outstanding amount, noncurrent	$ 0	$ 0
Weighted average interest rate (in percent)	2.46%	2.15%
Term Debt Facility 2021-S1 | Line of Credit | Asset-backed Senior Revolving Credit Facilities
Debt Instrument [Line Items]
Borrowing Capacity	$ 400
Outstanding amount, current	0	$ 0
Outstanding amount, noncurrent	$ 400	$ 400
Weighted average interest rate (in percent)	3.48%	3.48%
Term Debt Facility 2021-S2 | Line of Credit | Asset-backed Senior Revolving Credit Facilities
Debt Instrument [Line Items]
Borrowing Capacity	$ 600
Outstanding amount, current	0	$ 0
Outstanding amount, noncurrent	$ 500	$ 500
Weighted average interest rate (in percent)	3.20%	3.20%
Term Debt Facility 2021-S3 | Line of Credit | Asset-backed Senior Revolving Credit Facilities
Debt Instrument [Line Items]
Borrowing Capacity	$ 1,000
Outstanding amount, current	0	$ 0
Outstanding amount, noncurrent	$ 500	$ 0
Weighted average interest rate (in percent)	3.75%	3.75%
Term Debt Facility 2022-S1 | Line of Credit | Asset-backed Senior Revolving Credit Facilities
Debt Instrument [Line Items]
Borrowing Capacity	$ 250
Outstanding amount, current	0
Outstanding amount, noncurrent	$ 250
Weighted average interest rate (in percent)	4.07%
Term Debt Facility 2020-M1 | Line of Credit | Asset-backed Mezzanine Term Debt Facilities
Debt Instrument [Line Items]
Borrowing Capacity	$ 3,000
Outstanding amount, current	0	$ 0
Outstanding amount, noncurrent	$ 1,500	$ 1,000
Weighted average interest rate (in percent)	10.00%	10.00%
Term Debt Facility 2022-M1 | Line of Credit | Asset-backed Mezzanine Term Debt Facilities
Debt Instrument [Line Items]
Borrowing Capacity	$ 500
Outstanding amount, current	0
Outstanding amount, noncurrent	$ 75
Weighted average interest rate (in percent)	10.00%