Fair Value Measurements (Details 1) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used) Before-Tax Loss	$ 1	$ 23
Properties, plant and equipment, net (held for sale) Before-Tax Loss
Investments and advances Before Tax Loss		4
Total Assets at Fair Value Before-Tax Loss	1	27
Properties, plant and equipment, net (held and used)
Properties, plant and equipment, net (held for sale)
Investments and advances
Total Assets at Fair Value
Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)
Properties, plant and equipment, net (held for sale)
Investments and advances
Total Assets at Fair Value
Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)
Properties, plant and equipment, net (held for sale)
Investments and advances
Total Assets at Fair Value
Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)
Properties, plant and equipment, net (held for sale)
Investments and advances
Total Assets at Fair Value