Supplemental Cash Flow Information - Summary of Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Supplemental cash flow information:
Cash payments for interest, including $0 and $1, respectively, to related parties	$ 82	$ 55
Non-cash investing and financing activities:
Capital expenditures included in accounts payable and accrued liabilities	74	34
Property and equipment acquired under finance leases	81	37
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	139	52
Equity-based compensation expense capitalized to property and equipment	6	4
Fair value of beneficial interests received in securitization transactions	235	40
Reductions of beneficial interests in securitizations and associated long-term debt	22	21
Fair value of purchase price adjustment receivables received from sales of finance receivables	0	5
Debt issuance costs included in accounts payable and accrued liabilities	0	2
Related parties
Supplemental cash flow information:
Cash payments for interest, including $0 and $1, respectively, to related parties	$ 0	$ 1