Goodwill and Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill and Intangible Assets
Intangible assets (excluding goodwill) acquired through business combinations during the period	$ 342
Acquired intangible assets disclosures
Total gross carrying amount	3,007	2,692
Total accumulated amortization	(1,091)	(872)
Non-amortizable intangible assets (tradenames)	123	125
Total intangible assets - net	1,916	1,820
Amortization expense for acquired intangible assets	235	176	181
Expected amortization expense for acquired intangible assets recorded as of balance sheet date
2012	225
2013	214
2014	191
2015	178
2016	165
After 2016	820
Patents
Acquired intangible assets disclosures
Total gross carrying amount	561	551
Total accumulated amortization	(374)	(345)
Other amortizable intangible assets (primarily tradenames and customer related intangibles)
Acquired intangible assets disclosures
Total gross carrying amount	2,323	2,016
Total accumulated amortization	$ (717)	$ (527)