Condensed Consolidating Financial Information of Guarantor Subsidiaries - CONDENSED CONSOLIDATING BALANCE SHEET (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 337	$ 312	$ 219	$ 179
Accounts receivable, net	854	920
Intercompany receivable (payable)	0	0
Inventory	75	68
Prepaid expenses and other assets	54	61
Total current assets	1,320	1,361
Investments in subsidiaries	0	0
Goodwill	3,262	3,260
Other intangible assets, net	701	742
Other long-term assets	6	6
Total assets	11,822	11,988
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	577	597
Accounts payable	382	243
Accrued expenses and other liabilities	358	344
Total current liabilities	1,317	1,184
Long-term debt	6,772	7,193
Deferred taxes	1,911	1,896
Other long-term liabilities	69	67
Total liabilities	10,069	10,340
Total stockholders’ equity (deficit)	1,753	1,648
Total liabilities and stockholders’ equity	11,822	11,988
Eliminations
ASSETS
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	106	104
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	106	104
Investments in subsidiaries	(3,303)	(3,283)
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	(3,197)	(3,179)
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	0	0
Accounts payable	0	0
Accrued expenses and other liabilities	0	0
Total current liabilities	0	0
Long-term debt	0	0
Deferred taxes	0	0
Other long-term liabilities	0	0
Total liabilities	0	0
Total stockholders’ equity (deficit)	(3,197)	(3,179)
Total liabilities and stockholders’ equity	$ (3,197)	(3,179)
Parent
Condensed Financial Information Other Details [Abstract]
Ownership percentage in subsidiaries	100.00%
ASSETS
Cash and cash equivalents	$ 0	0	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	395	336
Inventory	0	0
Prepaid expenses and other assets	6	5
Total current assets	401	341
Investments in subsidiaries	1,342	1,292
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	1,781	1,671
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	1	1
Accounts payable	0	0
Accrued expenses and other liabilities	0	0
Total current liabilities	1	1
Long-term debt	2	2
Deferred taxes	25	20
Other long-term liabilities	0	0
Total liabilities	28	23
Total stockholders’ equity (deficit)	1,753	1,648
Total liabilities and stockholders’ equity	1,781	1,671
URNA
ASSETS
Cash and cash equivalents	14	21	4	18
Accounts receivable, net	38	38
Intercompany receivable (payable)	(188)	(137)
Inventory	68	61
Prepaid expenses and other assets	42	51
Total current assets	(26)	34
Investments in subsidiaries	978	1,013
Goodwill	3,013	3,013
Other intangible assets, net	648	686
Other long-term assets	6	6
Total assets	10,569	10,787
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	24	25
Accounts payable	344	217
Accrued expenses and other liabilities	321	305
Total current liabilities	689	547
Long-term debt	6,655	7,076
Deferred taxes	1,815	1,805
Other long-term liabilities	68	67
Total liabilities	9,227	9,495
Total stockholders’ equity (deficit)	1,342	1,292
Total liabilities and stockholders’ equity	$ 10,569	10,787
Guarantor Subsidiaries
Condensed Financial Information Other Details [Abstract]
Ownership percentage in subsidiaries	100.00%
ASSETS
Cash and cash equivalents	$ 0	0	0	0
Accounts receivable, net	0	0
Intercompany receivable (payable)	(196)	(188)
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	(196)	(188)
Investments in subsidiaries	983	978
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	817	816
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	0	0
Accounts payable	0	0
Accrued expenses and other liabilities	11	13
Total current liabilities	11	13
Long-term debt	111	111
Deferred taxes	0	0
Other long-term liabilities	1	0
Total liabilities	123	124
Total stockholders’ equity (deficit)	694	692
Total liabilities and stockholders’ equity	817	816
Non Guarantor Subsidiaries - Foreign
ASSETS
Cash and cash equivalents	323	291	215	161
Accounts receivable, net	87	96
Intercompany receivable (payable)	(117)	(115)
Inventory	7	7
Prepaid expenses and other assets	6	5
Total current assets	306	284
Investments in subsidiaries	0	0
Goodwill	249	247
Other intangible assets, net	53	56
Other long-term assets	0	0
Total assets	1,123	1,107
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	2	3
Accounts payable	38	26
Accrued expenses and other liabilities	25	25
Total current liabilities	65	54
Long-term debt	4	4
Deferred taxes	71	71
Other long-term liabilities	0	0
Total liabilities	140	129
Total stockholders’ equity (deficit)	983	978
Total liabilities and stockholders’ equity	1,123	1,107
Non Guarantor Subsidiaries - SPV
ASSETS
Cash and cash equivalents	0	0	$ 0	$ 0
Accounts receivable, net	729	786
Intercompany receivable (payable)	0	0
Inventory	0	0
Prepaid expenses and other assets	0	0
Total current assets	729	786
Investments in subsidiaries	0	0
Goodwill	0	0
Other intangible assets, net	0	0
Other long-term assets	0	0
Total assets	729	786
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
Short-term debt and current maturities of long-term debt	550	568
Accounts payable	0	0
Accrued expenses and other liabilities	1	1
Total current liabilities	551	569
Long-term debt	0	0
Deferred taxes	0	0
Other long-term liabilities	0	0
Total liabilities	551	569
Total stockholders’ equity (deficit)	178	217
Total liabilities and stockholders’ equity	729	786
Rental equipment, net
ASSETS
Property, plant and equipment, net	6,107	6,189
Rental equipment, net | Eliminations
ASSETS
Property, plant and equipment, net	0	0
Rental equipment, net | Parent
ASSETS
Property, plant and equipment, net	0	0
Rental equipment, net | URNA
ASSETS
Property, plant and equipment, net	5,631	5,709
Rental equipment, net | Guarantor Subsidiaries
ASSETS
Property, plant and equipment, net	0	0
Rental equipment, net | Non Guarantor Subsidiaries - Foreign
ASSETS
Property, plant and equipment, net	476	480
Rental equipment, net | Non Guarantor Subsidiaries - SPV
ASSETS
Property, plant and equipment, net	0	0
Property and equipment, net
ASSETS
Property, plant and equipment, net	426	430
Property and equipment, net | Eliminations
ASSETS
Property, plant and equipment, net	0	0
Property and equipment, net | Parent
ASSETS
Property, plant and equipment, net	38	38
Property and equipment, net | URNA
ASSETS
Property, plant and equipment, net	319	326
Property and equipment, net | Guarantor Subsidiaries
ASSETS
Property, plant and equipment, net	30	26
Property and equipment, net | Non Guarantor Subsidiaries - Foreign
ASSETS
Property, plant and equipment, net	39	40
Property and equipment, net | Non Guarantor Subsidiaries - SPV
ASSETS
Property, plant and equipment, net	0	$ 0
ABL Facility
Condensed Financial Information Other Details [Abstract]
Line of credit facility, restricted payment capacity	810
ABL Facility | URNA
Condensed Financial Information Other Details [Abstract]
Line of credit facility, restricted payment capacity	$ 415