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Financial Instruments Energy (Details) (USD $)
In Millions, unless otherwise specified
 8 Months Ended 12 Months Ended
Dec. 31, 2012
Commodity contracts
Not Designated as Hedging Instrument [Member]
Accrued Expenses and Other Liabilities [Member]
Dec. 31, 2011
Commodity contracts
Not Designated as Hedging Instrument [Member]
Accrued Expenses and Other Liabilities [Member]
Dec. 31, 2012
Energy Segment [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
Other Assets [Member]
Dec. 31, 2012
Swap [Member]
Energy Segment [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
bbl
Dec. 31, 2012
Other Income (Loss) [Member]
Energy Segment [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
Dec. 31, 2012
Other Income (Loss) [Member]
Swap [Member]
Energy Segment [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
Dec. 31, 2012
Cash Flow Hedging [Member]
Energy Segment [Member]
Interest rate swap contracts
Designated as Hedging Instrument [Member]
Dec. 31, 2012
Cash Flow Hedging [Member]
Energy Segment [Member]
Interest rate swap contracts
Designated as Hedging Instrument [Member]
Jul. 02, 2012
Cash Flow Hedging [Member]
Energy Segment [Member]
Interest rate swap contracts
Designated as Hedging Instrument [Member]
Dec. 31, 2012
Debt Facility [Member]
Term Loan [Member]
Energy Segment [Member]
Derivatives, Fair Value [Line Items]                    
Fair value of open commodity positions, net liability $ 68 [1] $ 0 [1] $ 1     $ 67        
Realized loss on commodity derivatives         4 176        
Barrels of crack spreads hedging margin on future gasoline and distillate production       23,300,000            
Balance of debt partially hedged                   125
Notional value of interest rate swap agreements             63 63    
Lower fixed interest rate paid on interest rate swaps             1.94% 1.94% 1.975%  
Frequency of interest rate swap settlements               90 days    
Average fixed interest rate paid on interest rate swaps             1.96% 1.96%    
Effective interest rate on debt hedged                   4.60%
Realized loss on interest rate swaps reclassified from AOCI into interest expense             $ 0.6      
[1] Net liability derivatives are located within accrued expenses and other liabilities in our consolidated balance sheets.