Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities
Net (loss) income	$ (109)	$ 197
Adjustments to reconcile net (loss) income to net cash from operating activities
Depreciation, amortization and net lease activity	379	360
Stock compensation expense	39	31
Accretion of debt	8	9
Deferred tax expense	3	12
Debt extinguishment loss	0	5
Unrealized (gain) loss on foreign currency option and forward contracts	(1)	9
Gains on sales of property and equipment	(39)	(40)
Other	42	23
Changes in assets and liabilities
Accounts receivable	186	(289)
Other assets	(84)	(23)
Accounts payable	(277)	(81)
Accrued expenses and other liabilities	247	(49)
Net cash provided by operating activities	394	164
Investing activities
Payment for purchases of property and equipment	(255)	(236)
Proceeds from sale of property and equipment	77	85
Cash collected on deferred purchase price receivable	0	137
Other	6	0
Net cash used in investing activities	(172)	(14)
Financing activities
Proceeds from issuance of debt	1,161	1,758
Proceeds from borrowings related to securitization program	109	0
Proceeds from borrowings on ABL facility	620	1,355
Repayment of borrowings on ABL facility	(20)	(1,355)
Repayment of debt and finance leases	(40)	(565)
Payment for debt issuance costs	(21)	(27)
Repurchase of common stock	(114)	(1,347)
Change in bank overdrafts	23	30
Payment for tax withholdings for restricted shares	(18)	(5)
Other	1	3
Net cash provided by (used in) financing activities	1,701	(153)
Effect of exchange rates on cash, cash equivalents and restricted cash	(15)	(2)
Net increase (decrease) in cash, cash equivalents and restricted cash	1,908	(5)
Cash, cash equivalents and restricted cash, beginning of period	387	514
Cash, cash equivalents and restricted cash, end of period	2,295	509
Supplemental disclosure of cash flow information
Leased assets obtained in exchange for new operating lease liabilities	371	327
Leased assets obtained in exchange for new finance lease liabilities	17	30
Cash paid for interest	149	125
Cash paid for income taxes	$ 10	$ 58