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Restructuring Activities (Tables)
12 Months Ended
Dec. 31, 2020
Restructuring and Related Activities [Abstract]  
Summary of Reserves and Charges
The following table summarizes the reserves and charges related to the workforce reduction programs, which are recorded in “Accounts payable and accrued liabilities.”
 2020
 (millions of dollars)
Balance at January 1— 
Additions/adjustments450 
Payments made(47)
Balance at December 31403