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Financing Arrangements (Tables)
6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Notes Payable
The following table summarizes the carrying value of notes payable at June 30, 2021 and December 31, 2020:
Millions of dollarsJune 30, 2021December 31, 2020
Short-term borrowings due to banks10 12 
Total notes payable$10 $12