Acquisitions (Details) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		1 Months Ended			6 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	May 31, 2014 ISG Holdings, Inc. [Member] USD ($)	Jan. 31, 2014 Invoco Holding GmbH [Member] USD ($)	Jan. 31, 2014 Invoco Holding GmbH [Member] EUR (€)	Jun. 30, 2014 Series of Individually Immaterial Business Acquisitions [Member] USD ($) businesses
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition					May 01, 2014	Jan. 15, 2014	Jan. 15, 2014
Payments to Acquire Businesses, Net of Cash Acquired	$ 227	$ 78	$ 281	$ 131	$ 225	$ 54	€ 40	$ 2
Number of Businesses Acquired								1