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Derivatives (Details 1)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
USD ($)
Dec. 31, 2011
USD ($)
Sep. 30, 2012
Other Current Assets [Member]
USD ($)
Dec. 31, 2011
Other Current Assets [Member]
USD ($)
Sep. 30, 2012
Other Assets [Member]
USD ($)
Dec. 31, 2011
Other Assets [Member]
USD ($)
Sep. 30, 2012
Other Liabilities [Member]
USD ($)
Dec. 31, 2011
Other Liabilities [Member]
USD ($)
Sep. 30, 2012
Other Noncurrent Liabilities [Member]
USD ($)
Dec. 31, 2011
Other Noncurrent Liabilities [Member]
USD ($)
Sep. 30, 2012
Designated as Hedging Instrument [Member]
USD ($)
Sep. 30, 2012
Designated as Hedging Instrument [Member]
CAD
Sep. 30, 2012
Designated as Hedging Instrument [Member]
JPY (¥)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
CAD
Dec. 31, 2011
Designated as Hedging Instrument [Member]
JPY (¥)
Sep. 30, 2012
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Other Current Assets [Member]
USD ($)
Sep. 30, 2012
Designated as Hedging Instrument [Member]
Other Assets [Member]
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Other Assets [Member]
USD ($)
Sep. 30, 2012
Designated as Hedging Instrument [Member]
Other Liabilities [Member]
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Other Liabilities [Member]
USD ($)
Sep. 30, 2012
Designated as Hedging Instrument [Member]
Other Noncurrent Liabilities [Member]
USD ($)
Dec. 31, 2011
Designated as Hedging Instrument [Member]
Other Noncurrent Liabilities [Member]
USD ($)
Sep. 30, 2012
Not Designated as Hedging Instrument [Member]
USD ($)
gal
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
USD ($)
gal
Sep. 30, 2012
Not Designated as Hedging Instrument [Member]
Other Current Assets [Member]
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Current Assets [Member]
USD ($)
Sep. 30, 2012
Not Designated as Hedging Instrument [Member]
Other Assets [Member]
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Assets [Member]
USD ($)
Sep. 30, 2012
Not Designated as Hedging Instrument [Member]
Other Liabilities [Member]
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Liabilities [Member]
USD ($)
Sep. 30, 2012
Not Designated as Hedging Instrument [Member]
Other Noncurrent Liabilities [Member]
USD ($)
Dec. 31, 2011
Not Designated as Hedging Instrument [Member]
Other Noncurrent Liabilities [Member]
USD ($)
Sep. 30, 2012
InterestRateCashFlowHedgesContract [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2011
InterestRateCashFlowHedgesContract [Member]
Designated as Hedging Instrument [Member]
Sep. 30, 2012
InterestRateFairValueHedgesContract [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2011
InterestRateFairValueHedgesContract [Member]
Designated as Hedging Instrument [Member]
Sep. 30, 2012
Foreign Exchange Contract [Member]
Designated as Hedging Instrument [Member]
Dec. 31, 2011
Foreign Exchange Contract [Member]
Designated as Hedging Instrument [Member]
Sep. 30, 2012
Commodity Contract [Member]
Not Designated as Hedging Instrument [Member]
Dec. 31, 2011
Commodity Contract [Member]
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]                                                                                    
Notional Amount of Interest Rate Cash Flow Hedge Derivatives                     $ 762     $ 989                                                        
Derivative, Maturity Date                                                                     May 31, 2019 May 31, 2019 Aug. 31, 2022 Aug. 31, 2022 Aug. 31, 2015 Apr. 30, 2014 Dec. 31, 2013 Dec. 31, 2012
Interest Rate Cash Flow Hedge Asset at Fair Value                                 0 0 0 0                                            
Interest Rate Cash Flow Hedge Liability at Fair Value                                         (23) (27) (53) (57)                                    
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net                     (76)     (84)                                                        
Notional Amount of Interest Rate Fair Value Hedge Derivatives                     469     500                                                        
Interest Rate Fair Value Hedge Asset at Fair Value                                 6 0 0 0                                            
Interest Rate Fair Value Hedge Liability at Fair Value                                         0 0 0 (7)                                    
Interest Rate Fair Value Hedge Derivative at Fair Value, Net                     6     (7)                                                        
Notional Amount of Foreign Currency Derivatives                       456 93,960   313 126,993                                                    
Foreign Currency Cash Flow Hedge Asset at Fair Value                                 1 7 2 5                                            
Foreign Currency Cash Flow Hedge Liability at Fair Value                                         (30) (58) (6) (43)                                    
Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net (33) (89)                 (33)     (89)                                                        
Notional Amount of Price Risk Derivatives Nonmonetary                                                 2,666,000,000 1,225,000,000                                
Price Risk Derivative Assets, at Fair Value                                                     549 570 86 0                        
Price Risk Derivative Liabilities, at Fair Value                                                             (283) (500) (100) 0                
Price Risk Derivatives, at Fair Value, Net 252 70                                             252 70                                
Derivative Asset, Fair Value, Gross Asset     556 577 88 5                                                                        
Derivative Liability, Fair Value, Gross Liability             336 585 159 107                                                                
Derivative, Fair Value, Net $ 149 $ (110)