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Leases
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Lessee, Operating Leases [Text Block] LEASES
Operating lease expense was $497 million and $323 million for 2020 and 2019, respectively. Finance leases and lessor leases are not considered significant to our Consolidated Balance Sheet or Consolidated Statement of Operations.
Variable least cost and sublease income were immaterial in 2020 and 2019.
In 2020, we entered into a sale and leaseback transaction 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 have been classified in decrease in Customer Financing Assets within the Investing Activities in our Consolidated statement of cash flows, and the portion related to future maintenance services has been classified within Operating Activities. The net gain as a result of this transaction was not material. Gains and losses on sale and leaseback transactions were immaterial in 2019.
Supplemental cash flow information related to operating leases were as follows:
(dollars in millions)20202019
Operating cash flows used in the measurement of operating lease liabilities$420 $411 
Operating lease right-of-use assets obtained in exchange for operating lease obligations299 123 
Future lease payments related to our operating lease liabilities as of December 31, 2020 are as follows:
(dollars in millions)
2021$632 
2022468 
2023335 
2024231 
2025158 
Thereafter646 
Total undiscounted lease payments (1)
2,470 
Less imputed interest(472)
Total discounted lease payments$1,998 
(1)    Total future lease payments excluded approximately $58 million of future lease payments related to leases that were signed but had not yet commenced as of December 31, 2020.
Our lease liabilities recognized in our Consolidated Balance Sheet were as follows as of December 31:
(dollars in millions)20202019
Operating lease liabilities, current (included in Other accrued liabilities)$(482)$(245)
Operating lease liabilities, noncurrent(1,516)(1,093)
Total operating lease liabilities$(1,998)$(1,338)
The weighted-average remaining lease term related to our operating leases was 8.0 years and 8.6 years as of December 31, 2020 and December 31, 2019, respectively. The weighted-average discount rate related to our operating leases was 3.1% and 3.5% as of December 31, 2020 and December 31, 2019, respectively.