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Leases (Tables) | 3 Months Ended
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Mar. 31, 2019
Leases [Abstract] |
Lease-Related Assets and Liabilities | Lease-related assets and liabilities recorded on the unaudited Condensed Consolidated Balance Sheet were as follows:
(in millions) | Balance Sheet location | March 31, 2019
Assets |  |
Operating | Operating lease right-of-use assets (net) | $ | 1,508 |
Finance | Property and equipment (net of allowance for depreciation and amortization of $372) | 890 |
Total lease assets |  | $ | 2,398 |
Liabilities |  |
Current |  |
Operating | Current operating lease liabilities | $ | 361 |
Finance | Current maturities of long-term debt | 85 |
Noncurrent |  |
Operating | Noncurrent operating lease liabilities | 1,150 |
Finance | Long-term debt less current maturities | 630 |
Total lease liabilities |  | $ | 2,226 |
Components of Lease Cost | The components of lease costs, included in the unaudited Condensed Consolidated Statement of Comprehensive Income, were as follows:
(in millions) | Statement of Comprehensive Income location | Three months ended March 31, 2019
Operating lease cost - aircraft (a) | Landing fees and airport rentals, and Other operating expenses | $ | 43 |
Operating lease cost - other | Landing fees and airport rentals, and Other operating expenses | 22 |
Short-term lease cost | Other operating expenses | 1 |
Variable lease cost | Landing fees and airport rentals, and Other operating expenses | 330 |
Finance lease cost: |  |
Amortization of lease liabilities | Depreciation and amortization | 29 |
Interest on lease liabilities | Interest expense | 7 |
Total net lease cost |  | $ | 432 |
(a) Net of sublease income of $25 million
Schedule of Cash Flow, Supplemental Disclosures | Supplemental cash flow information related to leases, included in the unaudited Condensed Consolidated Statement of Cash Flows, was as follows:
(in millions) | Three months ended March 31, 2019
Cash paid for amounts included in the measurement of lease liabilities: |
Operating cash flows for operating leases | $ | 96 |
Operating cash flows for finance leases | 7 |
Financing cash flows for finance leases | 22 |
Right-of-use assets obtained in exchange for lease obligations: |
Operating leases | 119 |
Finance leases | 1 |
Finance lease maturity | As of March 31, 2019, maturities of lease liabilities were as follows:
(in millions) | Operating leases |  | Finance leases
Remainder of 2019 | $ | 316 |  |  | $ | 83 |
2020 | 344 |  |  | 109 |
2021 | 212 |  |  | 104 |
2022 | 140 |  |  | 101 |
2023 | 109 |  |  | 97 |
Thereafter | 750 |  |  | 339 |
Total lease payments | $ | 1,871 |  |  | $ | 833 |
Less imputed interest | (360 | ) |  | (118 | )
Total lease obligations | 1,511 |  |  | 715 |
Less current obligations | (361 | ) |  | (85 | )
Long-term lease obligations | $ | 1,150 |  |  | $ | 630 |
Lessee Operating and Finance Leases Weighted Average Assumptions [Table Text Block] | The table below presents additional information related to the Company's leases for the three months ended March 31, 2019:
| Three months ended March 31, 2019
Weighted average remaining lease term |
Operating leases | 9 years |
Finance leases | 9 years |
Weighted average discount rate |
Operating leases (a) | 3.7 | %
Finance leases | 3.8 | %
(a) Upon adoption of the New Lease Standard, the incremental borrowing rate used for existing leases was established as of January 1, 2019.
Operating lease maturity | As of March 31, 2019, maturities of lease liabilities were as follows:
(in millions) | Operating leases |  | Finance leases
Remainder of 2019 | $ | 316 |  |  | $ | 83 |
2020 | 344 |  |  | 109 |
2021 | 212 |  |  | 104 |
2022 | 140 |  |  | 101 |
2023 | 109 |  |  | 97 |
Thereafter | 750 |  |  | 339 |
Total lease payments | $ | 1,871 |  |  | $ | 833 |
Less imputed interest | (360 | ) |  | (118 | )
Total lease obligations | 1,511 |  |  | 715 |
Less current obligations | (361 | ) |  | (85 | )
Long-term lease obligations | $ | 1,150 |  |  | $ | 630 |

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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 lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + 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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