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Financing Arrangements (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Notes Payable
The following table summarizes the carrying value of notes payable at June 30, 2018 and December 31, 2017.
Millions of dollars
 
June 30, 2018
 
December 31, 2017
Commercial paper
 
$
537

 
$
401

Short-term borrowings due to banks
 
1,259

 
49

Total notes payable
 
$
1,796

 
$
450