Fair Value Measurements (Details 1) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)	$ 0
Properties, plant and equipment, net (held for sale)	104
Investments and advances	0
Total Assets at Fair Value	104
Properties, plant and equipment, net (held and used) Before-Tax Loss	4
Properties, plant and equipment, net (held for sale) Before-Tax Loss	78
Investments and advances Before Tax Loss	0
Total Assets at Fair Value Before-Tax Loss	82
Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)	0
Properties, plant and equipment, net (held for sale)	0
Investments and advances	0
Total Assets at Fair Value	0
Level 2 [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)	0
Properties, plant and equipment, net (held for sale)	0
Investments and advances	0
Total Assets at Fair Value	0
Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)	0
Properties, plant and equipment, net (held for sale)	104
Investments and advances	0
Total Assets at Fair Value	$ 104