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Derivative Instruments - Schedule of Effect of Hedge Accounting on Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sales swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) on derivatives in AOCI $ 6 $ 0 $ (6) $ 0
Commodity purchase swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) on derivatives in AOCI 0 8 (7) 5
Net sales | Sales swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in income (6) 0 (9) 0
Cost of sales | Commodity purchase swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in income $ (4) $ (2) $ (3) $ (5)