Fair Value Measurements (Details 1) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Properties, plant and equipment, net (held and used)	$ 3,051	$ 947
Properties, plant and equipment, net (held for sale)	937	0
Investments and advances	75	11
Total Nonrecurring Assets at Fair Value	4,063	958
Properties, plant and equipment, net (held and used), Before-Tax Loss	3,222	1,249
Properties, plant and equipment, net (held for sale), Before-Tax Loss	844	25
Investments and advances, Before-Tax Loss	28	41
Total Nonrecurring Assets at Fair Value, Before-Tax Loss	4,094	1,315
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)	239	213
Properties, plant and equipment, net (held for sale)	937	0
Investments and advances	75	0
Total Nonrecurring Assets at Fair Value	1,251	213
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Properties, plant and equipment, net (held and used)	2,812	734
Properties, plant and equipment, net (held for sale)	0	0
Investments and advances	0	11
Total Nonrecurring Assets at Fair Value	$ 2,812	$ 745