Restructuring Costs (Restructuring Activities) (Details) (USD $) In Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2011		Dec. 31, 2010
Liability at beginning of period	$ 211		$ 259
Amount Accrued	5		141
Cash Paid	(53)		(189)
Other	6	[1]
Liability at end of period	169		211
Severance [Member]
Liability at beginning of period	40		77
Amount Accrued	5		79
Cash Paid	(29)		(116)
Other	1	[1]
Liability at end of period	17		40
Future Rent Under Non-Cancelable Leases and Other Costs [Member]
Liability at beginning of period	171		182
Amount Accrued			62
Cash Paid	(24)		(73)
Other	5	[1]
Liability at end of period	$ 152		$ 171

[1] Primarily foreign exchange