CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Equipment rentals									$ 4,949	$ 4,819	$ 4,196
Sales of rental equipment									538	544	490
Sales of new equipment									157	149	104
Contractor supplies sales									79	85	87
Service and other revenues									94	88	78
Total revenues	$ 1,523	$ 1,550	$ 1,429	$ 1,315	$ 1,564	$ 1,544	$ 1,399	$ 1,178	5,817	5,685	4,955
Cost of revenues:
Cost of equipment rentals, excluding depreciation									1,826	1,806	1,634
Depreciation of rental equipment									976	921	852
Cost of rental equipment sales									311	315	314
Cost of new equipment sales									131	120	84
Cost of contractor supplies sales									55	59	59
Cost of service and other revenues									38	32	25
Total cost of revenues									3,337	3,253	2,968
Gross profit	648	690	618	524	707	688	589	448	2,480	2,432	1,987
Selling, general and administrative expenses									714	758	642
Merger related costs									(26)	11	9
Restructuring charge									6	(1)	12
Non-rental depreciation and amortization									268	273	246
Operating income	397	446	375	300	426	422	325	218	1,518	1,391	1,078
Interest expense, net									567	555	475
Interest expense—subordinated convertible debentures									0	0	3
Other income, net									(12)	(14)	(5)
Income before provision for income taxes									963	850	605
Provision for income taxes									378	310	218
Net income	$ 169	$ 215	$ 86	$ 115	$ 194	$ 192	$ 94	$ 60	$ 585	$ 540	$ 387
Basic earnings per share (in dollars per share)	$ 1.82	$ 2.28	$ 0.89	$ 1.19	$ 1.96	$ 1.95	$ 0.98	$ 0.63	$ 6.14	$ 5.54	$ 4.14
Diluted earnings per share (in dollars per share)	$ 1.81	$ 2.25	$ 0.88	$ 1.16	$ 1.88	$ 1.84	$ 0.90	$ 0.56	$ 6.07	$ 5.15	$ 3.64