Goodwill and Other Intangible Assets Gross carrying value, accumulated amortization and net carrying value of ther intangible assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 4,246	$ 4,260
Finite-Lived Intangible Assets, Accumulated Amortization	(1,451)	(1,350)
Finite-Lived Intangible Assets, Net	2,795	2,910
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	3,766	3,623
Finite-Lived Intangible Assets, Accumulated Amortization	(1,310)	(1,038)
Finite-Lived Intangible Assets, Net	2,456	2,585
Trademarks and technology [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	368	505
Finite-Lived Intangible Assets, Accumulated Amortization	(98)	(246)
Finite-Lived Intangible Assets, Net	270	259
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	112	132
Finite-Lived Intangible Assets, Accumulated Amortization	(43)	(66)
Finite-Lived Intangible Assets, Net	$ 69	$ 66