Fair Value Measurements (Details 1) - Fair Value, Measurements, Nonrecurring [Member] $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)	$ 178	$ 178
Properties, plant and equipment, net (held for sale)	19	19
Investments and advances	1	1
Total Assets at Fair Value	198	198
Properties, plant and equipment, net (held and used), Before-Tax Loss	92	2,427
Properties, plant and equipment, net (held for sale), Before-Tax Loss	4	545
Investments and advances, Before Tax Loss	12	230
Total Assets at Fair Value, Before-Tax Loss	108	3,202
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)	19	19
Investments and advances	0	0
Total Assets at Fair Value	19	19
Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)	178	178
Properties, plant and equipment, net (held for sale)	0	0
Investments and advances	1	1
Total Assets at Fair Value	$ 179	$ 179