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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Schedule of Supplemental Balance Sheet Information
Supplemental balance sheet information related to leases is as follows:
(Millions of dollars)December 31, 2020December 31, 2019
Operating Leases
Operating lease right-of-use assets$935 $1,025 
Other current liabilities237 260 
Other long-term liabilities669 716 
Total operating lease liabilities906 976 
Finance Leases
Finance lease right-of-use assets*155 140 
Other current liabilities*38 32 
Other long-term liabilities*125 117 
Total finance lease liabilities$163 $149 
* Finance right of use assets at December 31, 2019 are recorded within property plant and equipment. Current and long-term finance lease liabilities at December 31, 2019 are recorded within current portion long-term debt and long-term debt, respectively.
Schedule of Supplemental Operating Lease Information
Supplemental operating lease information:
December 31, 2020December 31, 2019
Weighted average lease term (years)97
Weighted average discount rate2.83 %2.97 %
Schedule of Future Operating Lease Payments
Future operating and finance lease payments as of December 31, 2020 are as follows (millions of dollars):
PeriodOperating LeasesFinancing Leases
2021$251 $41 
2022187 37 
2023131 27 
202489 17 
202562 12 
Thereafter257 71 
Total future undiscounted lease payments977 205 
Less imputed interest(71)(42)
Total reported lease liability$906 $163 
Schedule of Future Financing Lease Payments
Future operating and finance lease payments as of December 31, 2020 are as follows (millions of dollars):
PeriodOperating LeasesFinancing Leases
2021$251 $41 
2022187 37 
2023131 27 
202489 17 
202562 12 
Thereafter257 71 
Total future undiscounted lease payments977 205 
Less imputed interest(71)(42)
Total reported lease liability$906 $163