Fair Value Measurements (Details 1) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)	$ 67	$ 57
Properties, plant and equipment, net (held for sale)	167	13
Investments and advances		0
Total Non-Recurring Assets at Fair Value	234	70
Properties, plant and equipment, net (held and used) before tax loss	81	85
Properties, plant and equipment, net (held for sale) before tax loss	54	36
Investments and advances before tax loss	108	15
Assets fair value before tax loss	243	136
Level 1 [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)	0	0
Properties, plant and equipment, net (held for sale)	0	0
Investments and advances	0	0
Total Non-Recurring Assets at Fair Value	0	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)	167	0
Investments and advances		0
Total Non-Recurring Assets at Fair Value	167	0
Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)	67	57
Properties, plant and equipment, net (held for sale)		13
Investments and advances		0
Total Non-Recurring Assets at Fair Value	$ 67	$ 70