Goodwill and Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Acquired intangible assets disclosures
Total gross carrying amount	$ 2,815		$ 2,884
Total accumulated amortization	(1,075)		(1,091)
Total finite-lived intangible assets - net	1,740		1,793
Non-amortizable intangible assets (tradenames)	125		123
Total intangible assets - net	1,865		1,916
Amortization expense for acquired intangible assets	58	54
Expected amortization expense for acquired intangible assets recorded as of balance sheet date
Remainder of 2012	170
2013	214
2014	191
2015	178
2016	166
2017	152
After 2017	669
Patents
Acquired intangible assets disclosures
Total gross carrying amount	564		561
Total accumulated amortization	(385)		(374)
Other amortizable intangible assets (primarily tradenames and customer related intangibles)
Acquired intangible assets disclosures
Total gross carrying amount	2,251		2,323
Total accumulated amortization	$ (690)		$ (717)