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Financial Instruments Energy (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Mar. 31, 2014
Foreign exchange contracts
Not Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Dec. 31, 2013
Foreign exchange contracts
Not Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Mar. 31, 2014
Credit contracts
Not Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Dec. 31, 2013
Credit contracts
Not Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Mar. 31, 2014
Commodity contracts
Not Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Dec. 31, 2013
Commodity contracts
Not Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Mar. 31, 2014
Energy Segment [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Mar. 31, 2014
Swap [Member]
Energy Segment [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
bbl
Dec. 31, 2013
Swap [Member]
Energy Segment [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
bbl
Mar. 31, 2014
Swap [Member]
Energy Segment [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Dec. 31, 2013
Swap [Member]
Energy Segment [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Mar. 31, 2014
Other income (loss), net [Member]
Energy Segment [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
Mar. 31, 2013
Other income (loss), net [Member]
Energy Segment [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
Mar. 31, 2014
Other income (loss), net [Member]
Swap [Member]
Energy Segment [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
Mar. 31, 2013
Other income (loss), net [Member]
Swap [Member]
Energy Segment [Member]
Commodity contracts
Not Designated as Hedging Instrument [Member]
Mar. 31, 2014
Cash Flow Hedging [Member]
Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Dec. 31, 2013
Cash Flow Hedging [Member]
Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Mar. 31, 2014
Cash Flow Hedging [Member]
Foreign exchange contracts
Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Dec. 31, 2013
Cash Flow Hedging [Member]
Foreign exchange contracts
Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Mar. 31, 2014
Cash Flow Hedging [Member]
Commodity contracts
Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Dec. 31, 2013
Cash Flow Hedging [Member]
Commodity contracts
Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Mar. 31, 2014
Cash Flow Hedging [Member]
Interest rate swap contracts
Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Dec. 31, 2013
Cash Flow Hedging [Member]
Interest rate swap contracts
Designated as Hedging Instrument [Member]
Accrued expenses and other liabilities [Member]
Mar. 31, 2014
Cash Flow Hedging [Member]
Energy Segment [Member]
Interest rate swap contracts
Designated as Hedging Instrument [Member]
Mar. 31, 2013
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]
Mar. 31, 2014
Debt Facility [Member]
Term Loan [Member]
Energy Segment [Member]
Derivatives, Fair Value [Line Items]                                                          
Liability Derivatives, Gross $ 846 [1] $ 687 [1] $ 2 [1] $ 0 [1] $ 8 [1] $ 0 [1] $ 5 [1] $ 33 [1]                   $ 5 [2] $ 5 [2] $ 0 [2] $ 1 [2] $ 3 [2] $ 2 [2] $ 2 [2] $ 2 [2]        
Derivative contract at fair value (liability)                 1     72 16                                
Realized loss on commodity derivatives                           1 2 110 18                        
Barrels of crack spreads hedging margin on future gasoline and distillate production                   18,100,000 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 $ 1    
[1] Net liability derivatives are located within accrued expenses and other liabilities in our consolidated balance sheets.
[2] Located within accrued expenses and other liabilities in our consolidated balance sheets.