Restructuring Costs (Restructuring Activities) (Details) (USD $) In Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2011		Dec. 31, 2010
Liability at beginning of period	$ 211		$ 259
Amount Accrued	16		141
Cash Paid	(70)		(189)
Other	2	[1]
Liability at end of period	159		211
Severance [Member]
Liability at beginning of period	40		77
Amount Accrued	9		79
Cash Paid	(37)		(116)
Other
Liability at end of period	12		40
Future Rent Under Non-Cancelable Leases and Other Costs [Member]
Liability at beginning of period	171		182
Amount Accrued	7		62
Cash Paid	(33)		(73)
Other	2	[1]
Liability at end of period	$ 147		$ 171

[1] Primarily foreign exchange