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Leases and Capacity Purchase Agreements - Summary of Scheduled Future Minimum Lease Payments under Operating and Finance Leases (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases
2021	$ 847
2022	693
2023	723
2024	704
2025	585
After 2025	3,979
Minimum lease payments	7,531
Imputed interest	(1,933)
Present value of minimum lease payments	5,598
Less: current maturities of lease obligations	(612)	$ (686)
Long-term lease obligations	4,986	4,946
Finance Leases
2021	198
2022	59
2023	51
2024	47
2025	35
After 2025	64
Minimum lease payments	454
Imputed interest	(48)
Present value of minimum lease payments	406
Less: current maturities of lease obligations	(182)	(46)
Long-term lease obligations	$ 224	$ 220

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