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Financial Instruments and Risk Management (Credit Risk) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Debt_Instrument
Dec. 31, 2014
USD ($)
Concentration Risk [Line Items]    
Senior Notes, Noncurrent $ 7,500  
Number of debt instruments with related interest rate swaps | Debt_Instrument 3  
Longterm Debt Percentage Bearing Fixed Interest Amount After Swaps $ 13,800  
Maximum term of currency derivative instruments (in years) 1 year  
Long-term Debt, Percentage Bearing Fixed Interest, Amount $ 15,346 $ 7,779
Geographic Concentration Risk | Accounts Receivable | United States    
Concentration Risk [Line Items]    
Concentration Risk, Percentage (in hundredths)   39.00%
United States | Accounts Receivable    
Concentration Risk [Line Items]    
Concentration Risk, Percentage (in hundredths) 26.00%  
VENEZUELA | Accounts Receivable    
Concentration Risk [Line Items]    
Concentration Risk, Percentage (in hundredths) 10.00% 9.00%