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Leases (Tables) | 3 Months Ended
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Mar. 31, 2019
Leases |
Summary of lease balance sheet information | Supplemental balance sheet information as of March 31, 2019 for our leases is as follows (in millions):
Leases |  | Classification |  |  |
Assets |  |  |  |  |
Long-term: |  |  |  |  |
Operating |  | Other assets |  | $ | 388
Financing |  | Property and equipment, net of accumulated depreciation and amortization |  |  | 228
Total lease assets |  |  |  | $ | 616
Liabilities |  |  |  |  |
Current: |  |  |  |  |
Operating |  | Accrued liabilities |  | $ | 85
Financing |  | Current portion of long-term debt |  |  | 22
Long-term: |  |  |  |  |
Operating |  | Other liabilities |  |  | 303
Financing |  | Long-term debt, less current portion |  |  | 185
Total lease liabilities |  |  |  | $ | 595
Summary of maturities of operating lease liabilities | Minimum contractual obligations for our leases (undiscounted) as of March 31, 2019 are as follows (in millions):
|  |  | Operating(a) |  |  | Financing(a)
2019 (excluding three months ended March 31, 2019) |  | $ | 67 |  | $ | 28
2020 |  |  | 82 |  |  | 34
2021 |  |  | 59 |  |  | 31
2022 |  |  | 46 |  |  | 31
2023 |  |  | 42 |  |  | 29
Thereafter |  |  | 414 |  |  | 188
Total |  | $ | 710 |  | $ | 341
| (a) |  | Includes $167 million and $61 million of undiscounted future minimum obligations related to additional operating and financing leases, respectively, which have not yet commenced.
Summary of maturities of finance lease liabilities |
|  |  | Operating(a) |  |  | Financing(a)
2019 (excluding three months ended March 31, 2019) |  | $ | 67 |  | $ | 28
2020 |  |  | 82 |  |  | 34
2021 |  |  | 59 |  |  | 31
2022 |  |  | 46 |  |  | 31
2023 |  |  | 42 |  |  | 29
Thereafter |  |  | 414 |  |  | 188
Total |  | $ | 710 |  | $ | 341
| (a) |  | Includes $167 million and $61 million of undiscounted future minimum obligations related to additional operating and financing leases, respectively, which have not yet commenced.

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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/2003/role/presentationRef -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/2003/role/presentationRef -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 Balance sheet information about leases. + References No definition available. + Details
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