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Fair Value Measurements (Details 3) - Nonrecurring Basis
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
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) 45 45
Investments and advances 11 11
Total Assets at Fair Value 56 56
Properties, plant and equipment, net (held and used), Before-Tax Loss 0 7
Properties, plant and equipment, net (held for sale), Before-Tax Loss 17 30
Investments and advances, Before Tax Loss 2 5
Total Assets at Fair Value, Before-Tax Loss 19 42
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 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 0
Properties, plant and equipment, net (held for sale) 45 45
Investments and advances 0 0
Total Assets at Fair Value 45 45
Level 3    
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 11 11
Total Assets at Fair Value $ 11 $ 11