Inventories (Tables)

12 Months Ended

Dec. 31, 2011

Inventories [Abstract]

Inventories at Lower of Cost or Market

	December 31,
	2011		2010
	(in millions)
Raw materials, components and sub-assemblies	$	121	$	114
Work in process		143		130
Finished goods		53		59
Total	$	317	$	303