Fair Value Measurements (Details 1) - Fair Value, Measurements, Nonrecurring [Member] $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)	$ 358	$ 358
Properties, plant and equipment, net (held for sale)	288	288
Investments and advances	23	23
Total Assets at Fair Value	669	669
Properties, plant and equipment, net (held and used), Before-Tax Loss	2,261	2,335
Properties, plant and equipment, net (held for sale), Before-Tax Loss	314	541
Investments and advances, Before Tax Loss	214	218
Total Assets at Fair Value, Before-Tax Loss	2,789	3,094
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)	13	13
Properties, plant and equipment, net (held for sale)	285	285
Investments and advances	20	20
Total Assets at Fair Value	318	318
Level 3 [Member]
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis
Properties, plant and equipment, net (held and used)	345	345
Properties, plant and equipment, net (held for sale)	3	3
Investments and advances	3	3
Total Assets at Fair Value	$ 351	$ 351