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Leases (Tables) | 6 Months Ended
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Jun. 30, 2019
Leases |
Summary of lease balance sheet information | Supplemental balance sheet information for our leases is as follows (in millions):
​ | ​ | ​ | ​ | ​ | ​
Leases |  | Classification |  | ​ | June 30, 2019
Assets |  | ​ | ​ | ​ | ​
Long-term: |  | ​ | ​ | ​ | ​
Operating | ​ | Other assets | ​ | $ | 378
Financing | ​ | Property and equipment, net of accumulated depreciation and amortization | ​ | ​ | 349
Total lease assets | ​ | ​ | ​ | $ | 727
​ | ​ | ​ | ​ | ​ | ​
Liabilities | ​ | ​ | ​ | ​ | ​
Current: | ​ | ​ | ​ | ​ | ​
Operating | ​ | Accrued liabilities | ​ | $ | 89
Financing | ​ | Current portion of long-term debt | ​ | ​ | 33
Long-term: | ​ | ​ | ​ | ​ | ​
Operating | ​ | Other liabilities | ​ | ​ | 300
Financing | ​ | Long-term debt, less current portion | ​ | ​ | 296
Total lease liabilities | ​ | ​ | ​ | $ | 718
Summary of maturities of operating lease liabilities | Minimum contractual obligations for our leases (undiscounted) as of June 30, 2019 are as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | Operating |  | ​ | Financing
2019 (excluding six months ended June 30, 2019) |  | $ | 45 | ​ | $ | 22
2020 |  | ​ | 87 | ​ | ​ | 42
2021 |  | ​ | 55 | ​ | ​ | 40
2022 |  | ​ | 45 | ​ | ​ | 39
2023 | ​ | ​ | 37 | ​ | ​ | 38
Thereafter | ​ | ​ | 268 | ​ | ​ | 235
Total lease payments | ​ | $ | 537 | ​ | $ | 416
Less: interest | ​ | ​ | (148) | ​ | ​ | (87)
Discounted lease liabilities | ​ | $ | 389 | ​ | $ | 329
​ As of June 30, 2019, we entered into leases, primarily for real estate, that have not yet commenced with future lease payments of $167 million that are not reflected in the table above. These leases will commence through 2020 with non-cancelable lease terms up to 15 years. ​
Summary of maturities of finance lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | Operating |  | ​ | Financing
2019 (excluding six months ended June 30, 2019) |  | $ | 45 | ​ | $ | 22
2020 |  | ​ | 87 | ​ | ​ | 42
2021 |  | ​ | 55 | ​ | ​ | 40
2022 |  | ​ | 45 | ​ | ​ | 39
2023 | ​ | ​ | 37 | ​ | ​ | 38
Thereafter | ​ | ​ | 268 | ​ | ​ | 235
Total lease payments | ​ | $ | 537 | ​ | $ | 416
Less: interest | ​ | ​ | (148) | ​ | ​ | (87)
Discounted lease liabilities | ​ | $ | 389 | ​ | $ | 329
​ As of June 30, 2019, we entered into leases, primarily for real estate, that have not yet commenced with future lease payments of $167 million that are not reflected in the table above. These leases will commence through 2020 with non-cancelable lease terms up to 15 years. ​

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- Definition Tabular disclosure of undiscounted cash flows of finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance 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=77888426&loc=SL77918701-209980 + Details
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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=77888426&loc=SL77918701-209980 + Details
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