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Acquisitions (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		0 Months Ended	12 Months Ended
	Mar. 31, 2013 company	Mar. 31, 2012	Feb. 05, 2013 PIMS Group Employees	Dec. 31, 2012 MultiTrode Pty Ltd	Mar. 01, 2013 MultiTrode Pty Ltd	Feb. 05, 2013 MultiTrode Pty Ltd Employees
Business Acquisition [Line Items]
Cash payment to acquire business	$ 81		$ 55
Total spent on business acquisitions	78	0
Number of acquisitions	2
Purchase price			57		26
Number of employees			220			60
Revenue from acquired entity			$ 38	$ 13

This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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