Derivative Instruments - Fair Values of Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair values of derivative instruments on the consolidated balance sheets
Total assets	$ 2	$ 13
Total liabilities	17	10
Derivatives Not Designated as Hedging Instruments
Fair values of derivative instruments on the consolidated balance sheets
Total assets	0	1
Total liabilities	0	0
Commodity contracts | Other current assets | Derivatives Not Designated as Hedging Instruments
Fair values of derivative instruments on the consolidated balance sheets
Total assets	0	1
Commodity contracts | Other assets | Derivatives Not Designated as Hedging Instruments
Fair values of derivative instruments on the consolidated balance sheets
Total assets	0	0
Commodity contracts | Accrued expenses | Derivatives Not Designated as Hedging Instruments
Fair values of derivative instruments on the consolidated balance sheets
Total liabilities	0	0
Commodity contracts | Other liabilities | Derivatives Not Designated as Hedging Instruments
Fair values of derivative instruments on the consolidated balance sheets
Total liabilities	0	0
Derivatives Designated as Hedging Instruments | Derivatives Designated as Hedging Instruments
Fair values of derivative instruments on the consolidated balance sheets
Total assets	2	12
Total liabilities	17	10
Derivatives Designated as Hedging Instruments | Commodity contracts | Other current assets | Derivatives Designated as Hedging Instruments
Fair values of derivative instruments on the consolidated balance sheets
Total assets	1	8
Derivatives Designated as Hedging Instruments | Commodity contracts | Other assets | Derivatives Designated as Hedging Instruments
Fair values of derivative instruments on the consolidated balance sheets
Total assets	1	3
Derivatives Designated as Hedging Instruments | Commodity contracts | Accrued expenses | Derivatives Designated as Hedging Instruments
Fair values of derivative instruments on the consolidated balance sheets
Total liabilities	6	4
Derivatives Designated as Hedging Instruments | Commodity contracts | Other liabilities | Derivatives Designated as Hedging Instruments
Fair values of derivative instruments on the consolidated balance sheets
Total liabilities	8	5
Derivatives Designated as Hedging Instruments | Foreign exchange contracts | Other current assets | Derivatives Designated as Hedging Instruments
Fair values of derivative instruments on the consolidated balance sheets
Total assets	0	1
Derivatives Designated as Hedging Instruments | Foreign exchange contracts | Accrued expenses | Derivatives Designated as Hedging Instruments
Fair values of derivative instruments on the consolidated balance sheets
Total liabilities	$ 3	$ 1