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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, 2019
Dec. 31, 2018
 [1]
Operating Leases    
2020 $ 920  
2021 754  
2022 591  
2023 633  
2024 626  
After 2024 4,214  
Minimum lease payments 7,738  
Imputed interest (2,106)  
Present value of minimum lease payments 5,632  
Less: current maturities of lease obligations (686) $ (719)
Long-term lease obligations 4,946 5,276
Finance Leases    
2020 62  
2021 75  
2022 49  
2023 38  
2024 35  
After 2024 57  
Minimum lease payments 316  
Imputed interest (50)  
Present value of minimum lease payments 266  
Less: current maturities of lease obligations (46) (123)
Long-term lease obligations $ 220 $ 224
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.