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Financial Instruments Energy (Details) (Energy Segment [Member], USD $)
In Millions, unless otherwise specified
2 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2012
Sep. 30, 2012
Sep. 30, 2012
Jul. 02, 2012
Commodity contracts [Member] | Not Designated as Hedging Instrument [Member] | Other Assets [Member]
       
Derivatives, Fair Value [Line Items]        
Fair value of open commodity positions, net liability   $ 1 $ 1  
Swap [Member] | Commodity contracts [Member] | Not Designated as Hedging Instrument [Member]
       
Derivatives, Fair Value [Line Items]        
Barrels of crack spreads hedging margin on future gasoline and distillate production   26,300,000 26,300,000  
Other Income (Loss) [Member] | Commodity contracts [Member] | Not Designated as Hedging Instrument [Member]
       
Derivatives, Fair Value [Line Items]        
Realized loss on commodity derivatives 4 7    
Other Income (Loss) [Member] | Swap [Member] | Commodity contracts [Member] | Not Designated as Hedging Instrument [Member]
       
Derivatives, Fair Value [Line Items]        
Fair value of open commodity positions, net liability   116 116  
Realized loss on commodity derivatives 168 162    
Cash Flow Hedging [Member] | Interest rate swap contracts [Member] | Designated as Hedging Instrument [Member]
       
Derivatives, Fair Value [Line Items]        
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%  
Realized loss on interest rate swaps reclassified from AOCI into interest expense 0.3 0.2    
Debt Facility [Member] | Term Loan [Member]
       
Derivatives, Fair Value [Line Items]        
Balance of debt partially hedged   $ 125 $ 125  
Effective interest rate on debt hedged   4.60% 4.60%