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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