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Fair Value Measurements (Details 1) - Nonrecurring Basis
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Properties, plant and equipment, net (held and used) $ 106 $ 106
Properties, plant and equipment, net (held for sale) 115 115
Investments and advances 12 12
Total Assets at Fair Value 233 233
Properties, plant and equipment, net (held and used), Before-Tax Loss 36 654
Properties, plant and equipment, net (held for sale), Before-Tax Loss 11 290
Investments and advances, Before Tax Loss 8 14
Total Assets at Fair Value, Before-Tax Loss 55 958
Level 1    
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    
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) 115 115
Investments and advances 0 0
Total Assets at Fair Value 115 115
Level 3    
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Properties, plant and equipment, net (held and used) 106 106
Properties, plant and equipment, net (held for sale) 0 0
Investments and advances 12 12
Total Assets at Fair Value $ 118 $ 118