Acquisitions (Debt) (Details) (USD $) In Millions, unless otherwise specified			1 Months Ended
	Dec. 31, 2012 10 1/4 percent Senior Notes [Member]	Dec. 31, 2012 8 1/4 percent Senior Notes [Member]	Apr. 30, 2012 RSC [Member]	Apr. 30, 2012 RSC [Member] 10 percent Senior Notes [Member]	Apr. 30, 2012 RSC [Member] 9.5 percent Senior Notes [Member]	Apr. 30, 2012 RSC [Member] 10 1/4 percent Senior Notes [Member]	Apr. 30, 2012 RSC [Member] 8 1/4 percent Senior Notes [Member]	Apr. 30, 2012 RSC [Member] Capital Leases [Member]
Debt Instrument [Line Items]
Stated interest rate	10.25%	8.25%		10.00%	9.50%	10.25%	8.25%
Extinguishment of debt			$ (1,555)
Assumed debt			$ (1,023)			$ (225)	$ (699)	$ (99)