Condensed Consolidated Statement of Comprehensive Income (Loss) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
OPERATING REVENUE:
Operating Revenue	$ 4,234	$ 5,149
OPERATING EXPENSES:
Salaries, wages, and benefits	1,854	1,976
Fuel and oil	870	1,015
Landing fees and airport rentals	339	333
Maintenance materials and repairs	272	293
Depreciation and amortization	311	297
Other operating expenses	698	730
Operating Costs and Expenses	4,344	4,644
OPERATING INCOME (LOSS)	(110)	505
OTHER EXPENSES (INCOME):
Interest expense	28	31
Capitalized interest	(5)	(9)
Interest income	(17)	(23)
Other (gains) losses, net	28	2
Total other expenses (income)	34	1
INCOME (LOSS) BEFORE INCOME TAXES	(144)	504
PROVISION FOR INCOME TAXES	(50)	117
NET INCOME (LOSS)	$ (94)	$ 387
NET INCOME (LOSS) PER SHARE, BASIC	$ (0.18)	$ 0.70
NET INCOME (LOSS) PER SHARE, DILUTED	$ (0.18)	$ 0.70
COMPREHENSIVE INCOME (LOSS)	$ (219)	$ 463
BASIC WEIGHTED AVERAGE SHARES OUTSTANDING
Basic	515	551
DILUTED WEIGHTED AVERAGE SHARES OUTSTANDING
Diluted	515	552
Passenger
OPERATING REVENUE:
Operating Revenue	$ 3,845	$ 4,745
Freight
OPERATING REVENUE:
Operating Revenue	39	42
Other
OPERATING REVENUE:
Operating Revenue	$ 350	$ 362