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Financial Instruments, Derivatives and Hedging Activities (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Commodity contracts
Minimum
Dec. 31, 2013
Commodity contracts
Maximum
Dec. 31, 2013
Derivatives in Cash-Flow Hedging Relationships
Commodity contracts
Dec. 31, 2012
Derivatives in Cash-Flow Hedging Relationships
Commodity contracts
Dec. 31, 2013
Derivatives in Cash-Flow Hedging Relationships
T-Locks
Dec. 31, 2012
Derivatives in Cash-Flow Hedging Relationships
T-Locks
Dec. 31, 2013
Fair-value hedge
Interest rate swaps
3.2% senior notes due November 1, 2015
Dec. 31, 2012
Fair-value hedge
Interest rate swaps
3.2% senior notes due November 1, 2015
Mar. 25, 2011
Fair-value hedge
Interest rate swaps
3.2% senior notes due November 1, 2015
Dec. 31, 2013
Fair-value hedge
Foreign currency forward contracts
Dec. 31, 2012
Fair-value hedge
Foreign currency forward contracts
Dec. 31, 2013
Fair-value hedge
Foreign currency forward contracts
Short
Dec. 31, 2012
Fair-value hedge
Foreign currency forward contracts
Short
Dec. 31, 2013
Fair-value hedge
Foreign currency forward contracts
Long
Dec. 31, 2012
Fair-value hedge
Foreign currency forward contracts
Long
Financial instruments, derivatives and hedging activities                                      
Maturity period of price risk derivative         12 months 18 months                          
Accumulated gains (losses) from derivative instruments, net of tax effect $ (583) $ (475) $ (413) $ (190)     $ (32) $ (7) $ (8) $ (10)       $ 1          
Accumulated losses from derivative instruments, income tax effect             15 4                      
Debt, fixed interest rate (as a percent)                         3.20%            
Debt, face amount                         350            
Debt, fixed interest rate (as a percent)                         3.20%            
Fair value of interest rate swap agreements                     13 20              
Debt, floating rate of interest basis                     six-month US dollar LIBOR plus a spread                
Losses on cash flow hedges, income tax effect                 5 6                  
Fair value of foreign currency forward contract liabilities                           5 5        
Foreign currency hedging                                      
Derivative notional amount                               $ 147 $ 268 $ 78 $ 167