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Leases - Related Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Accumulated amortization | $ 679 | $ 567
Operating | 1,590 | 1,892
Finance | 556 | 667
Total lease assets | $ 2,146 | $ 2,559
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Flight equipment | Flight equipment
Current |  |
Operating | $ 239 | $ 306
Finance | $ 82 | $ 83
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Long-term Debt and Lease Obligation, Current | Long-term Debt and Lease Obligation, Current
Noncurrent |  |
Operating | $ 1,315 | $ 1,562
Finance | $ 377 | $ 459
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Long-term debt less current maturities | Long-term debt less current maturities
Total lease liabilities | $ 2,013 | $ 2,410

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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