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Financial Instruments and Risk Management (Details)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Debt_Instrument
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment maturity range (current)   1 year    
Available-for-sale Securities, Debt Maturities, Date   Nov. 01, 2020    
Foreign Currency Derivatives [Abstract]        
Maximum term of currency derivative instruments (in years)   1 year    
Interest Rate Derivatives [Abstract]        
Number of debt instruments with related interest rate swaps | Debt_Instrument   1    
Long-term Debt, Excluding Current Maturities   $ 10,430 $ 12,214  
Early Repayment of Senior Debt $ 1,400      
Level 3        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total debt   0 0  
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]        
Fair value of marketable securities   32 70  
Level 1        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]        
Fair value of marketable securities   0 0  
Level 2        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]        
Fair value of marketable securities   106 92  
Estimate of Fair Value, Fair Value Disclosure        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total debt   12,457 13,565  
Estimate of Fair Value, Fair Value Disclosure | Level 1        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total debt   3,285 753  
Estimate of Fair Value, Fair Value Disclosure | Level 2        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Total debt   9,172 12,812  
Carrying (Reported) Amount, Fair Value Disclosure        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Debt, Long-term and Short-term, Combined Amount   10,942 12,384  
Other current assets        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]        
Available-for-sale securities, current   69    
Other assets        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]        
Available-for-sale securities, noncurrent   37    
Interest Rate Swap [Member]        
Foreign Currency Derivatives [Abstract]        
Derivative, Notional Amount   100    
Foreign Exchange Contract [Member]        
Foreign Currency Derivatives [Abstract]        
Derivative, Notional Amount   633 603  
VENEZUELA        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Venezuela promissory note, carrying value   32 $ 70  
Venezuela promissory note, par value   175   $ 200
VENEZUELA | Other assets        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Venezuela promissory note, carrying value   $ 32