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Leases | 12 Months Ended
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Dec. 31, 2020
Leases |
Leases | 8. Leases Our operating lease activities primarily consist of leases for real estate, landfills and operating equipment. Our financing lease activities primarily consist of leases for operating equipment, railcars and landfill assets. Leases with an initial term of 12 months or less, which are not expected to be renewed beyond one year, are not recorded on the balance sheet and are recognized as lease expense on a straight-line basis over the lease term. Most leases include one or more options to renew, with renewal terms generally ranging from one to 10 years. The exercise of lease renewal options is at our sole discretion. We include the renewal term in the calculation of the right-of-use asset and related lease liability when such renewals are reasonably certain of being exercised. Certain leases also include options to purchase the leased property. The depreciable life of assets and leasehold improvements is limited by the expected lease term, unless there is a transfer of title or purchase option reasonably certain of exercise. Certain of our lease agreements include rental payments based on usage and other lease agreements include rental payments adjusted periodically for inflation; these payments are treated as variable lease payments. Our lease agreements do not contain any material residual value guarantees or material restrictive covenants. When the implicit interest rate is not readily available for our leases, we discount future cash flows of the remaining lease payments using the current interest rate that would be paid to borrow on collateralized debt over a similar term, or incremental borrowing rate, at the commencement date. Supplemental balance sheet information for our leases as of December 31 is as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Leases |  | Classification |  | 2020 |  | 2019
Assets |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Long-term: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating | ​ | Other assets | ​ | $ | 466 | ​ | $ | 424
Financing | ​ | Property and equipment, net of accumulated depreciation and amortization | ​ | ​ | 386 | ​ | ​ | 374
Total lease assets | ​ | ​ | ​ | $ | 852 | ​ | $ | 798
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Current: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating | ​ | Accrued liabilities | ​ | $ | 63 | ​ | $ | 79
Financing | ​ | Current portion of long-term debt | ​ | ​ | 50 | ​ | ​ | 36
Long-term: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Operating | ​ | Other liabilities | ​ | ​ | 453 | ​ | ​ | 366
Financing | ​ | Long-term debt, less current portion | ​ | ​ | 314 | ​ | ​ | 323
Total lease liabilities | ​ | ​ | ​ | $ | 880 | ​ | $ | 804
​ Operating lease expense was $140 million, $132 million and $129 million during 2020, 2019 and 2018, respectively, and is included in operating and selling, general and administrative expenses in our Consolidated Statement of Operations. Financing lease expense for 2020 and 2019 was $51 million and $48 million, respectively, and is included in depreciation and amortization expense and interest expense, net in our Consolidated Statement of Operations. Minimum contractual obligations for our leases (undiscounted) as of December 31, 2020 are as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | Operating |  | ​ | Financing
2021 |  | $ | 59 | ​ | $ | 61
2022 |  | ​ | 71 | ​ | ​ | 52
2023 |  | ​ | 64 | ​ | ​ | 47
2024 |  | ​ | 55 | ​ | ​ | 43
2025 | ​ | ​ | 42 | ​ | ​ | 39
Thereafter | ​ | ​ | 362 | ​ | ​ | 234
Total undiscounted lease payments | ​ | $ | 653 | ​ | $ | 476
Less: interest | ​ | ​ | (137) | ​ | ​ | (112)
Discounted lease liabilities | ​ | $ | 516 | ​ | $ | 364
​ Cash paid during 2020 for our operating and financing leases was $91 million and $51 million, respectively. During 2020, right-of-use assets obtained in exchange for lease obligations for our operating and financing leases were $128 million and $35 million, respectively. Cash paid during 2019 for our operating and financing leases was $87 million and $40 million, respectively. During 2019, right-of-use assets obtained in exchange for lease obligations for our operating and financing leases were $149 million and $134 million, respectively. As of December 31, 2020, the weighted average remaining lease terms of our operating and financing leases were approximately 16 years and 15 years, respectively. The weighted average discount rates used to determine the lease liabilities as of December 31, 2020 for our operating and financing leases were approximately 2.90% and 3.70%, respectively.

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