Acquisitions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013 Zeno Office Solutions, Inc. [Member]	Mar. 31, 2013 Impika [Member]	Sep. 30, 2013 Document Technology [Member] Series of Individually Immaterial Business Acquisitions [Member] businesses	Sep. 30, 2013 Services Segment [Member] Series of Individually Immaterial Business Acquisitions [Member] businesses
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition					Apr. 01, 2013	Feb. 28, 2013
Payments to Acquire Businesses, Net of Cash Acquired	$ 24	$ 156	$ 158	$ 243	$ 59	$ 53	$ 11	$ 31
Number of Businesses Acquired							1	3