Commitments and contingencies (Tables)

12 Months Ended

Dec. 31, 2011

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, 2011, 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
2012	$	102	$	73	$	215
2013	77		35		97
2014	55		31		20
2015	48		12		4
2016	36		—		2
Thereafter	118		—		10