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Financial Instruments and Risk Management - Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Fair Value Measurements    
Total current derivative contracts, assets $ 44 $ 64
Total noncurrent derivative contracts, assets 1 6
Total current derivative contracts, liabilities 34 31
Total noncurrent derivative contracts, liabilities 170 120
Commodity contracts    
Fair Value Measurements    
Total current derivative contracts, assets 35 49
Total noncurrent derivative contracts, assets 1 6
Total current derivative contracts, liabilities 19 8
Foreign currency contracts    
Fair Value Measurements    
Total current derivative contracts, assets 9 15
Total current derivative contracts, liabilities 13 21
Derivatives Designated As Hedging Instruments    
Fair Value Measurements    
Total current derivative contracts, assets 33 51
Total noncurrent derivative contracts, assets 1 6
Total current derivative contracts, liabilities 16 4
Total noncurrent derivative contracts, liabilities 170 117
Derivatives Designated As Hedging Instruments | Commodity contracts    
Fair Value Measurements    
Total current derivative contracts, assets 30 46
Total noncurrent derivative contracts, assets 1 6
Total current derivative contracts, liabilities 15 4
Derivatives Designated As Hedging Instruments | Foreign currency contracts    
Fair Value Measurements    
Total current derivative contracts, assets 3 5
Total current derivative contracts, liabilities 1  
Derivatives Not Designated as Hedging Instruments    
Fair Value Measurements    
Total current derivative contracts, assets 11 13
Total current derivative contracts, liabilities 18 27
Total noncurrent derivative contracts, liabilities   3
Derivatives Not Designated as Hedging Instruments | Commodity contracts    
Fair Value Measurements    
Total current derivative contracts, assets 5 3
Total current derivative contracts, liabilities 4 4
Derivatives Not Designated as Hedging Instruments | Foreign currency contracts    
Fair Value Measurements    
Total current derivative contracts, assets 6 10
Total current derivative contracts, liabilities $ 12 $ 21