Fair Value Measurements (Details 1) - Fair Value, Measurements, Nonrecurring [Member] $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)	$ 66	$ 66
Properties, plant and equipment, net (held for sale)	445	445
Investments and advances	0	0
Total Assets at Fair Value	511	511
Properties, plant and equipment, net (held and used) Before-Tax Loss	134	2,700
Properties, plant and equipment, net (held for sale) Before-Tax Loss	121	393
Investments and advances Before Tax Loss	1	23
Total Assets at Fair Value Before-Tax Loss	256	3,116
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)	5	5
Properties, plant and equipment, net (held for sale)	445	445
Investments and advances	0	0
Total Assets at Fair Value	450	450
Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)	61	61
Properties, plant and equipment, net (held for sale)	0	0
Investments and advances	0	0
Total Assets at Fair Value	$ 61	$ 61