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Leases (Tables) | 12 Months Ended
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Dec. 31, 2020
Leases |
Summary of lease balance sheet information | 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
Summary of maturities of operating lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | 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
Summary of maturities of finance lease liabilities | 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

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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