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Financial Instruments and Risk Management (Details 1) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Asset Derivatives    
Total Asset Derivatives $ 2 $ 91
Liability Derivatives    
Total Liability Derivatives (75) (11)
Designated as Hedging Instrument [Member]
    
Asset Derivatives    
Total Asset Derivatives 1 79
Liability Derivatives    
Total Liability Derivatives (68) (10)
Designated as Hedging Instrument [Member] | Forward contracts [Member] | Other receivables and assets [Member]
    
Asset Derivatives    
Total Asset Derivatives 0 46
Designated as Hedging Instrument [Member] | Forward contracts [Member] | Other payables and accrued liabilities [Member]
    
Liability Derivatives    
Total Liability Derivatives (39) (8)
Designated as Hedging Instrument [Member] | Collars [Member] | Other receivables and assets [Member]
    
Asset Derivatives    
Total Asset Derivatives 1 0
Designated as Hedging Instrument [Member] | Collars [Member] | Other investments and other non-current assets[ Member]
    
Asset Derivatives    
Total Asset Derivatives 0 6
Designated as Hedging Instrument [Member] | Collars [Member] | Other payables and accrued liabilities [Member]
    
Liability Derivatives    
Total Liability Derivatives (29) (2)
Designated as Hedging Instrument [Member] | Contingent zero-cost collars [Member] | Other receivables and assets [Member]
    
Asset Derivatives    
Total Asset Derivatives 0 27
Derivative instruments not designated as a hedge [Member]
    
Asset Derivatives    
Total Asset Derivatives 1 12
Liability Derivatives    
Total Liability Derivatives (7) (1)
Derivative instruments not designated as a hedge [Member] | Forward contracts [Member] | Other receivables and assets [Member]
    
Asset Derivatives    
Total Asset Derivatives 1 12
Derivative instruments not designated as a hedge [Member] | Forward contracts [Member] | Other payables and accrued liabilities [Member]
    
Liability Derivatives    
Total Liability Derivatives $ (7) $ (1)