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Financial Instruments, Derivatives and Hedging Activities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Financial instruments, derivatives and hedging activities        
Accumulated gains (losses) from derivative instruments, net of tax effect $ (1,067) $ (1,102) $ (925) $ (782)
Senior Notes 4.625 Percent Due November 1, 2020        
Financial instruments, derivatives and hedging activities        
Debt, face amount $ 400      
Commodity Contract | Minimum        
Financial instruments, derivatives and hedging activities        
Maturity period of price risk derivative 12 months      
Commodity Contract | Maximum        
Financial instruments, derivatives and hedging activities        
Maturity period of price risk derivative 24 months      
Cash Flow Hedging | Commodity Contract        
Financial instruments, derivatives and hedging activities        
Accumulated gains (losses) from derivative instruments, net of tax effect $ (27) (21)    
Accumulated gains (losses) from derivative instruments, net income tax effect 14 10    
Cash Flow Hedging | Treasury Lock        
Financial instruments, derivatives and hedging activities        
Accumulated gains (losses) from derivative instruments, net of tax effect (5) (5)    
Accumulated gains (losses) from derivative instruments, net income tax effect 2 2    
Fair value of interest rate derivatives 0 0    
Fair Value Hedging | Interest Rate Swap        
Financial instruments, derivatives and hedging activities        
Fair value of interest rate derivatives 15 7    
Carrying amount of Fair value adjustment related to hedged fixed rate instrument debt instrument $ 15 7    
Fair Value Hedging | Interest Rate Swap | Senior Notes 6.0 Percent Due April 15, 2017        
Financial instruments, derivatives and hedging activities        
Debt, fixed interest rate (as a percent) 6.00%      
Debt, face amount $ 200      
Debt, floating rate of interest basis six-month US dollar LIBOR      
Fair Value Hedging | Interest Rate Swap | Senior Notes 1.8 Percent Due September 25, 2017        
Financial instruments, derivatives and hedging activities        
Debt, fixed interest rate (as a percent) 1.80%      
Debt, face amount $ 300      
Debt, floating rate of interest basis six-month US dollar LIBOR      
Fair Value Hedging | Interest Rate Swap | Senior Notes 4.625 Percent Due November 1, 2020        
Financial instruments, derivatives and hedging activities        
Debt, fixed interest rate (as a percent) 4.625%      
Debt, face amount $ 200      
Debt, floating rate of interest basis six-month US dollar LIBOR      
Fair Value Hedging | Foreign Exchange Forward        
Financial instruments, derivatives and hedging activities        
Fair value of assets   10    
Fair value of liabilities $ 18      
Fair Value Hedging | Foreign Exchange Forward | Short        
Foreign currency hedging        
Derivative notional amount 384 606    
Fair Value Hedging | Foreign Exchange Forward | Long        
Foreign currency hedging        
Derivative notional amount $ 60 $ 287