Goodwill and Other Intangible Assets Schedule of Other Intangible Assets by Major Class (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Summary of other intangible assets
Intangible assets not subject to amortization (primarily trademarks)	$ 451	$ 451
Intangible assets subject to amortization
Historical cost	2,503	2,463
Accumulated amortization	762	642
Customer Relationships [Member]
Intangible assets subject to amortization
Historical cost	1,173	1,187
Accumulated amortization	322	274
Patents and Technology [Member]
Intangible assets subject to amortization
Historical cost	849	835
Accumulated amortization	308	260
Finite Lived Intangible Assets, Other [Member]
Intangible assets subject to amortization
Historical cost	481	441
Accumulated amortization	$ 132	$ 108