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Financial Instruments, Derivatives and Hedging Activities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financial instruments, derivatives and hedging activities        
Accumulated gains (losses) from derivative instruments, net of tax effect $ (1,013) $ (1,071) $ (1,102) $ (782)
Carrying amount of fair value adjustment related to hedged fixed rate instrument debt instrument 1 3    
Senior Notes 4.625 Percent Due November 1, 2020        
Financial instruments, derivatives and hedging activities        
Debt, face amount $ 400      
Commodity Contracts | Minimum        
Financial instruments, derivatives and hedging activities        
Maturity period of price risk derivative 12 months      
Commodity Contracts | Maximum        
Financial instruments, derivatives and hedging activities        
Maturity period of price risk derivative 24 months      
Treasury Lock        
Foreign currency hedging        
Derivative notional amount $ 0 0    
Cash Flow Hedging | Commodity Contracts        
Financial instruments, derivatives and hedging activities        
Accumulated gains (losses) from derivative instruments, net of tax effect (12)      
Accumulated gains (losses) from derivative instruments, net income tax effect 7      
Cash Flow Hedging | Treasury Lock        
Financial instruments, derivatives and hedging activities        
Accumulated gains (losses) from derivative instruments, net of tax effect (2) (4)    
Accumulated gains (losses) from derivative instruments, net income tax effect 1 2    
Cash Flow Hedging | Foreign Exchange Forward        
Financial instruments, derivatives and hedging activities        
Accumulated gains (losses) from derivative instruments, net of tax effect 1      
Accumulated gains (losses) from derivative instruments, net income tax effect (1)      
Fair Value Hedging        
Financial instruments, derivatives and hedging activities        
Fair value of interest rate derivatives $ 1 3    
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 U.S. LIBOR      
Fair Value Hedging | Foreign Exchange Forward        
Financial instruments, derivatives and hedging activities        
Fair value of assets $ 11 5    
Fair Value Hedging | Foreign Exchange Forward | Short        
Foreign currency hedging        
Derivative notional amount 447 432    
Fair Value Hedging | Foreign Exchange Forward | Long        
Foreign currency hedging        
Derivative notional amount $ 121 $ 227