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Restructuring and Other Charges (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Roll Forward of Restructuring Reserve

Amounts related to activities that are part of our restructuring plans are as follows:

 

     December 31,
2016
Restructuring
Reserve		      2017
Expenses		      2017
Cash
Payments		     Impact of
Exchange
Rates		      December 31,
2017
Restructuring
Reserve		  
     (Millions)  

Employee Severance, Termination Benefits and Other Related Costs

    $ 15        49        (41 )      2      $ 25