Integration and Restructuring Costs (Restructuring Activities) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Restructuring Reserve [Roll Forward]
Liability at beginning of period	$ 211		$ 259	$ 222
Amount Accrued	51		141	243
Cash Paid	(82)		(189)	(206)
Other	1	[1]
Liability at end of period	181		211	259
Severance [Member]
Restructuring Reserve [Roll Forward]
Liability at beginning of period	40		77
Amount Accrued	29		79
Cash Paid	(40)		(116)
Other	(2)	[1]
Liability at end of period	27		40
Future Rent Under Non-Cancelable Leases and Other Costs [Member]
Restructuring Reserve [Roll Forward]
Liability at beginning of period	171		182
Amount Accrued	22		62
Cash Paid	(42)		(73)
Other	3	[1]
Liability at end of period	$ 154		$ 171

[1] Primarily foreign exchange