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Leases
 12 Months Ended
Dec. 31, 2021
Leases [Abstract]  
Lessee, Operating Leases [Text Block] LEASES
Operating lease expense was $525 million, $497 million, and $323 million for 2021, 2020, and 2019 respectively. Finance leases and leases where we are the lessor are not considered significant to our Consolidated Balance Sheet or Consolidated Statement of Operations.
In both 2021 and 2020, we entered into sale and leaseback transactions for the sale of equipment and related maintenance. We subsequently leased back the equipment sold for a limited timeframe, which is accounted for as an operating lease. The proceeds received as a result of the equipment sales are classified in Receipts from customer financing assets within the Investing Activities in our Consolidated Statement of Cash Flows, and the portion related to future maintenance services are classified within Operating Activities. The net gains as a result of these transactions were not material.
Supplemental cash flow information related to operating leases were as follows:
(dollars in millions)202120202019
Operating cash flows used in the measurement of operating lease liabilities$490 $420 $411 
Operating lease right-of-use assets obtained in exchange for operating lease obligations535 299 123 
Future lease payments related to our operating lease liabilities as of December 31, 2021 are as follows:
(dollars in millions)
2022$421 
2023359 
2024295 
2025248 
2026198 
Thereafter839 
Total undiscounted lease payments2,360 
Less imputed interest(292)
Total discounted lease payments$2,068 
Our lease liabilities recognized in our Consolidated Balance Sheet were as follows as of December 31:
(dollars in millions)20212020
Operating lease liabilities, current (included in Other accrued liabilities)$411 $482 
Operating lease liabilities, noncurrent1,657 1,516 
Total operating lease liabilities$2,068 $1,998 
The weighted-average remaining lease term related to our operating leases was 9 years and 8 years as of December 31, 2021 and 2020, respectively. The weighted-average discount rate related to our operating leases was 2.8% and 3.1% as of December 31, 2021 and 2020, respectively.