Fair Value Measurements Nonrecurring Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of property, plant, and equipment prior to impairment charge		$ 79		$ 79
Property, Plant, and Equipment, Fair Value Disclosure		28		28
Impairment of Long-Lived Assets Held-for-use	0	51	0	51
Impairment Of Long Lived Assets Held For Use After Tax		$ 31		$ 31