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Fair Value Measurements (Details 1) - Nonrecurring basis - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Properties, plant and equipment, net (held and used) $ 603 $ 582
Properties, plant and equipment, net (held for sale) 1,378 891
Investments and advances 28 26
Total nonrecurring assets at fair value 2,009 1,499
Properties, plant and equipment, net (held and used), Before-Tax Loss 658 2,507
Properties, plant and equipment, net (held for sale), Before-Tax Loss 363 679
Investments and advances, Before-Tax Loss 26 234
Total nonrecurring assets at fair value, Before-Tax Loss 1,047 3,420
Level 1    
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    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Properties, plant and equipment, net (held and used) 0 15
Properties, plant and equipment, net (held for sale) 1,378 888
Investments and advances 1 20
Total nonrecurring assets at fair value 1,379 923
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Properties, plant and equipment, net (held and used) 603 567
Properties, plant and equipment, net (held for sale) 0 3
Investments and advances 27 6
Total nonrecurring assets at fair value $ 630 $ 576