CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows From Operating Activities:
Net income	$ 1,096	$ 1,346	$ 566
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,671	1,383	1,245
Amortization of deferred financing costs and original issue discounts	12	9	9
Gain on sales of rental equipment	(278)	(220)	(204)
Gain on sales of non-rental equipment	(6)	(4)	(4)
Gain on insurance proceeds from damaged equipment	22	21	12
Stock compensation expense, net	102	87	45
Merger related costs	36	50	0
Restructuring charge	31	50	14
Loss on repurchase/redemption of debt securities and amendment of ABL facility	0	54	101
Excess tax benefits from share-based payment arrangements	0	0	(58)
Increase (decrease) in deferred taxes (note 13)	257	(533)	123
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(115)	(184)	15
(Increase) decrease in inventory	(20)	1	1
Decrease (increase) in prepaid expenses and other assets	75	(20)	77
Increase (decrease) in accounts payable	49	141	(29)
(Decrease) increase in accrued expenses and other liabilities	(35)	70	52
Net cash provided by operating activities	2,853	2,209	1,941
Cash Flows From Investing Activities:
Purchases of rental equipment	(2,106)	(1,769)	(1,246)
Purchases of non-rental equipment	(185)	(120)	(93)
Proceeds from sales of rental equipment	664	550	496
Proceeds from sales of non-rental equipment	23	16	14
Insurance proceeds from damaged equipment	22	21	12
Purchases of other companies, net of cash acquired	(2,966)	(2,377)	(28)
Purchases of investments	(3)	(5)	(2)
Net cash used in investing activities	(4,551)	(3,684)	(847)
Cash Flows From Financing Activities:
Proceeds from debt	12,178	11,801	8,752
Payments of debt	(9,942)	(10,207)	(9,223)
Payments of financing costs	(24)	(44)	(24)
Proceeds from the exercise of common stock options	2	3	1
Common stock repurchased	(817)	(56)	(528)
Excess tax benefits from share-based payment arrangements	0	0	58
Net cash provided by (used in) financing activities	1,397	1,497	(964)
Effect of foreign exchange rates	(8)	18	3
Net (decrease) increase in cash and cash equivalents	(309)	40	133
Cash and cash equivalents at beginning of year	352	312	179
Cash and cash equivalents at end of year	43	352	312
Supplemental disclosure of cash flow information:
Cash paid for interest	455	357	415
Cash paid for income taxes, net	$ 71	$ 205	$ 99