Derivative Instruments (Details 1) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative assets	$ 5	$ 4
Derivative liabilities	21	26
Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Derivative liabilities	4	5
Derivatives Not Designated as Hedging Instruments | Commodity contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Derivatives Not Designated as Hedging Instruments | Commodity contracts | Other assets
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Derivatives Not Designated as Hedging Instruments | Commodity contracts | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivative liabilities	3	4
Derivatives Not Designated as Hedging Instruments | Commodity contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	1	1
Cash flow hedging | Derivatives in Cash Flow Hedging Relationships
Derivatives, Fair Value [Line Items]
Derivative assets	5	4
Derivative liabilities	17	21
Cash flow hedging | Derivatives in Cash Flow Hedging Relationships | Commodity contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	1	1
Cash flow hedging | Derivatives in Cash Flow Hedging Relationships | Commodity contracts | Other assets
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Cash flow hedging | Derivatives in Cash Flow Hedging Relationships | Commodity contracts | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivative liabilities	11	14
Cash flow hedging | Derivatives in Cash Flow Hedging Relationships | Commodity contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	6	7
Cash flow hedging | Derivatives in Cash Flow Hedging Relationships | Foreign exchange contracts | Other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	4	3
Cash flow hedging | Derivatives in Cash Flow Hedging Relationships | Foreign exchange contracts | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ 0	$ 0