CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows From Operating Activities:
Net income	$ 890	$ 1,174	$ 1,096
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,988	2,038	1,671
Amortization of deferred financing costs and original issue discounts	14	15	12
Gain on sales of rental equipment	(332)	(313)	(278)
Gain on sales of non-rental equipment	(8)	(6)	(6)
Insurance proceeds from damaged equipment	(40)	(24)	(22)
Stock compensation expense, net	70	61	102
Merger related costs	0	1	36
Restructuring charge	17	18	31
Loss on repurchase/redemption of debt securities and amendment of ABL facility	183	61	0
(Decrease) increase in deferred taxes	(121)	204	257
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	218	39	(115)
Increase in inventory	(5)	(8)	(20)
(Increase) decrease in prepaid expenses and other assets	(228)	(59)	75
Increase (decrease) in accounts payable	10	(86)	49
Increase (decrease) in accrued expenses and other liabilities	2	(91)	(35)
Net cash provided by operating activities	2,658	3,024	2,853
Cash Flows From Investing Activities:
Purchases of rental equipment	(961)	(2,132)	(2,106)
Purchases of non-rental equipment	(197)	(218)	(185)
Proceeds from sales of rental equipment	858	831	664
Proceeds from sales of non-rental equipment	42	37	23
Insurance proceeds from damaged equipment	40	24	22
Purchases of other companies, net of cash acquired	(2)	(249)	(2,966)
Purchases of investments	(3)	(3)	(3)
Net cash used in investing activities	(223)	(1,710)	(4,551)
Cash Flows From Financing Activities:
Proceeds from debt	9,260	9,260	12,178
Payments of debt	(11,245)	(9,678)	(9,942)
Payments of financing costs	(23)	(28)	(24)
Proceeds from the exercise of common stock options	1	11	2
Common stock repurchased	(286)	(870)	(817)
Net cash (used in) provided by financing activities	(2,293)	(1,305)	1,397
Effect of foreign exchange rates	8	0	(8)
Net increase (decrease) in cash and cash equivalents	150	9	(309)
Cash and cash equivalents at beginning of year	52	43	352
Cash and cash equivalents at end of year	202	52	43
Supplemental disclosure of cash flow information:
Cash paid for interest	483	581	455
Cash paid for income taxes, net	$ 318	$ 238	$ 71