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Financial Instruments Energy (Details) (Energy Segment [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Commodity contracts
Not Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Mar. 31, 2013
Swap [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
bbl
Dec. 31, 2012
Swap [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
bbl
Mar. 31, 2013
Swap [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Dec. 31, 2012
Swap [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Mar. 31, 2013
Other income (loss), net [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
Mar. 31, 2013
Other income (loss), net [Member]
Swap [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
Mar. 31, 2013
Cash Flow Hedging [Member]
Interest rate swap contracts
Designated as Hedging Instrument [Member]
Jul. 02, 2012
Cash Flow Hedging [Member]
Interest rate swap contracts
Designated as Hedging Instrument [Member]
Mar. 31, 2013
Debt Facility [Member]
Term Loan [Member]
Derivatives, Fair Value [Line Items]                    
Derivative contract at fair value (liability) $ 1     $ 34 $ 67          
Realized loss on commodity derivatives           2 18      
Barrels of crack spreads hedging margin on future gasoline and distillate production   22,800,000 23,300,000              
Balance of debt partially hedged                   125
Notional value of interest rate swap agreements               63    
Lower fixed interest rate paid on interest rate swaps               1.94% 1.975%  
Frequency of interest rate swap settlements               90 days    
Average fixed interest rate paid on interest rate swaps               1.96%    
Effective interest rate on debt hedged                   4.60%
Realized loss on interest rate swaps reclassified from AOCI into interest expense               $ 1