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Financing Arrangements (Tables)
9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Notes Payable
The following table summarizes the carrying value of notes payable at September 30, 2018 and December 31, 2017.
Millions of dollars
 
September 30, 2018
 
December 31, 2017
Commercial paper
 
$
907

 
$
401

Short-term borrowings due to banks
 
1,246

 
49

Total notes payable
 
$
2,153

 
$
450