Commitments and contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Minimum Payments Under Non Cancellable Operating Leases Capitalized Software Licenses And Purchase Commitments Disclosure Text Block

Some of our purchase commitments entered in the ordinary course of business provide for minimum payments. At December 31, 2012, we had committed to make the following minimum payments under our non-cancellable operating leases, capitalized software licenses and purchase commitments:

	Operating Leases		Capitalized Software Licenses		Purchase Commitments
2013	$	102	$	46	$	77
2014	77		33		54
2015	66		14		25
2016	49		—		18
2017	32		—		10
Thereafter	80		—		22