Fair Value Measurements (Details 1) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Properties, plant and equipment, net (held and used)	$ 582	$ 3,051
Properties, plant and equipment, net (held for sale)	891	937
Investments and advances	26	75
Total nonrecurring assets at fair value	1,499	4,063
Properties, plant and equipment, net (held and used), Before-Tax Loss	2,507	3,222
Properties, plant and equipment, net (held for sale), Before-Tax Loss	679	844
Investments and advances, Before-Tax Loss	234	28
Total nonrecurring assets at fair value, Before-Tax Loss	3,420	4,094
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
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 nonrecurring assets at fair value	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Properties, plant and equipment, net (held and used)	15	239
Properties, plant and equipment, net (held for sale)	888	937
Investments and advances	20	75
Total nonrecurring assets at fair value	923	1,251
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Properties, plant and equipment, net (held and used)	567	2,812
Properties, plant and equipment, net (held for sale)	3	0
Investments and advances	6	0
Total nonrecurring assets at fair value	$ 576	$ 2,812