Derivative Instruments (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair values of derivative instruments on the consolidated balance sheets
Total assets	$ 4	$ 5
Total liabilities	26	0
Derivatives Not Designated as Hedging Instruments
Fair values of derivative instruments on the consolidated balance sheets
Total assets	0	2
Total liabilities	5	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	2
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	4	0
Commodity contracts | Other liabilities | Derivatives Not Designated as Hedging Instruments
Fair values of derivative instruments on the consolidated balance sheets
Total liabilities	1	0
Derivatives in Cash Flow Hedging Relationships | Derivatives in Cash Flow Hedging Relationships
Fair values of derivative instruments on the consolidated balance sheets
Total assets	4	3
Total liabilities	21	0
Derivatives in Cash Flow Hedging Relationships | Commodity contracts | Other current assets | Derivatives in Cash Flow Hedging Relationships
Fair values of derivative instruments on the consolidated balance sheets
Total assets	1	2
Derivatives in Cash Flow Hedging Relationships | Commodity contracts | Other assets | Derivatives in Cash Flow Hedging Relationships
Fair values of derivative instruments on the consolidated balance sheets
Total assets	0	0
Derivatives in Cash Flow Hedging Relationships | Commodity contracts | Accrued expenses | Derivatives in Cash Flow Hedging Relationships
Fair values of derivative instruments on the consolidated balance sheets
Total liabilities	14	0
Derivatives in Cash Flow Hedging Relationships | Commodity contracts | Other liabilities | Derivatives in Cash Flow Hedging Relationships
Fair values of derivative instruments on the consolidated balance sheets
Total liabilities	7	0
Derivatives in Cash Flow Hedging Relationships | Foreign exchange contracts | Other current assets | Derivatives in Cash Flow Hedging Relationships
Fair values of derivative instruments on the consolidated balance sheets
Total assets	3	1
Derivatives in Cash Flow Hedging Relationships | Foreign exchange contracts | Accrued expenses | Derivatives in Cash Flow Hedging Relationships
Fair values of derivative instruments on the consolidated balance sheets
Total liabilities	$ 0	$ 0