Severance and Exit Costs 1 (Details) (USD $) In Millions, unless otherwise specified					3 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012 Severance [Member]	Jun. 30, 2011 Severance [Member]	Jun. 30, 2012 Facility Abandonment [Member]	Jun. 30, 2011 Facility Abandonment [Member]
Accrued severance and exit costs and changes in the accruals
Accrued beginning balance	$ 41	$ 53	$ 50	$ 55	$ 13	$ 8	$ 40	$ 47
Expense
Change in Estimate					(3)	(1)		1
Payments					(5)	(2)	(3)	(4)
Accretion and Other							(1)	1
Accrued ending balance	$ 41	$ 53	$ 50	$ 55	$ 5	$ 5	$ 36	$ 45