Commitments and Contingencies (Capital Lease Obligations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Capital Leased Assets [Line Items]
Debt and capital lease obligations	$ 7,173		$ 7,309
Depreciation of rental equipment	852		699		423
Non-rental depreciation and amortization	246		198		57
Less accumulated depreciation and amortization	(13)		(9)
Property and equipment, net	23		31
Rental Equipment [Member]
Capital Leased Assets [Line Items]
Depreciation of rental equipment	22		15		3
Property and equipment	171		167
Less accumulated depreciation and amortization	(38)		(23)
Property and equipment, net	133		144
Non Rental Equipment [Member]
Capital Leased Assets [Line Items]
Non-rental depreciation and amortization	5		4		4
Non-rental vehicles [Member]
Capital Leased Assets [Line Items]
Property and equipment	18		23
Buildings [Member]
Capital Leased Assets [Line Items]
Property and equipment	18		17
Subsidiaries [Member]
Capital Leased Assets [Line Items]
Debt and capital lease obligations	7,037		7,172
Capital leases [Member] | Subsidiaries [Member]
Capital Leased Assets [Line Items]
Debt and capital lease obligations	$ 120	[1]	$ 148	[1]

[1] Upon consummation of the RSC merger, we assumed certain of RSC's debt, including capital leases. See below for additional detail regarding the assumed RSC debt.