Acquisitions (Intangibles) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2012 Trade names, associated trademarks and other [Member]	Apr. 30, 2012 RSC [Member]		Apr. 30, 2012 RSC [Member] Customer relationships [Member]	Apr. 30, 2012 RSC [Member] Trade names, associated trademarks and other [Member]	Apr. 30, 2012 RSC [Member] Non-Compete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Fair value		$ 1,224	[1]	$ 1,094	$ 81	$ 49
Life (years)	5 years			15 years	5 years	5 years
Goodwill deductible for income tax purposes		$ 39

[1] The following table reflects the estimated fair values and useful lives of the acquired intangible assets identified based on our preliminary purchase accounting assessments: Fair value Life (years) Customer relationships$1,09415 Trade names and associated trademarks815 Non-compete agreements495 Total$1,224