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Derivatives (Details-BS) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset   $ 91
Derivative Asset, Fair Value, Gross Liability   0
Derivative Asset, Fair Value, Net   91
Not Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset   52
Derivative Asset, Fair Value, Gross Liability   0
Derivative Asset, Fair Value, Net   52
Commodity [Member] | Other Current Assets [Member] | Not Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset   52
Derivative Asset, Fair Value, Gross Liability   0
Derivative Asset, Fair Value, Net   52
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 10 39
Derivative Asset, Fair Value, Gross Liability 0 0
Derivative Asset, Fair Value, Net 10 39
Derivative Liability, Fair Value, Gross Asset 0  
Derivative Liability, Fair Value, Gross Liability 4  
Derivative Liability, Fair Value, Net 4  
Fair Value Hedging [Member] | Foreign Exchange Contract [Member] | Other Current Liabilities [Member] | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Liability, Fair Value, Gross Asset 0  
Derivative Liability, Fair Value, Gross Liability 4  
Derivative Liability, Fair Value, Net 4  
Fair Value Hedging [Member] | Foreign Exchange Contract [Member] | Other Current Assets [Member] | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 2 18
Derivative Asset, Fair Value, Gross Liability 0 0
Derivative Asset, Fair Value, Net 2 18
Fair Value Hedging [Member] | Interest rate [Member] | Other Noncurrent Assets [Member] | Designated as Hedging Instrument [Member]
   
Derivatives Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 8 21
Derivative Asset, Fair Value, Gross Liability 0 0
Derivative Asset, Fair Value, Net $ 8 $ 21