CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows From Operating Activities:
Net income	$ 1,346	$ 566	$ 585
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,383	1,245	1,244
Amortization of deferred financing costs and original issue discounts	9	9	10
Gain on sales of rental equipment	(220)	(204)	(227)
Gain on sales of non-rental equipment	(4)	(4)	(8)
Stock compensation expense, net	87	45	49
Merger related costs	50	0	(26)
Restructuring charge	50	14	6
Loss on repurchase/redemption of debt securities and amendment of ABL facility	54	101	123
Excess tax benefits from share-based payment arrangements	0	(58)	(5)
(Decrease) increase in deferred taxes (note 13)	(533)	123	336
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(184)	15	(11)
Decrease in inventory	1	1	8
(Increase) decrease in prepaid expenses and other assets	(20)	77	(38)
Increase (decrease) in accounts payable	141	(29)	(8)
Increase (decrease) in accrued expenses and other liabilities	70	52	(43)
Net cash provided by operating activities	2,230	1,953	1,995
Cash Flows From Investing Activities:
Purchases of rental equipment	(1,769)	(1,246)	(1,534)
Purchases of non-rental equipment	(120)	(93)	(102)
Proceeds from sales of rental equipment	550	496	538
Proceeds from sales of non-rental equipment	16	14	17
Purchases of other companies, net of cash acquired	(2,377)	(28)	(86)
Purchases of investments	(5)	(2)	(3)
Net cash used in investing activities	(3,705)	(859)	(1,170)
Cash Flows From Financing Activities:
Proceeds from debt	11,801	8,752	8,566
Payments of debt	(10,207)	(9,223)	(8,482)
Payment of contingent consideration	0	0	(52)
Payments of financing costs	(44)	(24)	(27)
Proceeds from the exercise of common stock options	3	1	1
Common stock repurchased	(56)	(528)	(789)
Cash received in connection with the 4 percent Convertible Senior Notes and related hedge, net	0	0	3
Excess tax benefits from share-based payment arrangements	0	58	5
Net cash provided by (used in) financing activities	1,497	(964)	(775)
Effect of foreign exchange rates	18	3	(29)
Net increase in cash and cash equivalents	40	133	21
Cash and cash equivalents at beginning of year	312	179	158
Cash and cash equivalents at end of year	352	312	179
Supplemental disclosure of cash flow information:
Cash paid for interest	357	415	447
Cash paid for income taxes, net	$ 205	$ 99	$ 60