Fair Value Measurements (Details 1) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
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)	10	10
Investments and advances	18	18
Total Assets at Fair Value	28	28
Properties, plant and equipment, net (held and used) Before-Tax Loss	10	14
Properties, plant and equipment, net (held for sale) Before-Tax Loss	6	84
Investments and advances Before Tax Loss	103	103
Total Assets at Fair Value Before-Tax Loss	119	201
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 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	0
Properties, plant and equipment, net (held for sale)	0	0
Investments and advances	15	15
Total Assets at Fair Value	15	15
Level 3 [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)	10	10
Investments and advances	3	3
Total Assets at Fair Value	$ 13	$ 13