Condensed Consolidated Statement of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
OPERATING REVENUE:
Operating Revenue	$ 5,575	$ 5,303	$ 16,261	$ 15,888
OPERATING EXPENSES:
Salaries, wages, and benefits	1,912	1,791	5,659	5,385
Fuel and oil	1,205	1,037	3,425	3,016
Maintenance materials and repairs	283	263	814	758
Landing fees and airport rentals	337	324	1,011	969
Depreciation and amortization	301	302	870	939
Other operating expenses	739	741	2,096	2,154
Total operating expenses	4,777	4,458	13,875	13,221
OPERATING INCOME	798	845	2,386	2,667
OTHER EXPENSES (INCOME):
Interest Expense	33	28	99	84
Capitalized interest	(9)	(15)	(29)	(38)
Interest income	(20)	(9)	(47)	(24)
Other (gains) losses, net	8	9	16	115
Total other expenses (income)	12	13	39	137
INCOME BEFORE INCOME TAXES	786	832	2,347	2,530
PROVISION FOR INCOME TAXES	171	304	536	920
NET INCOME	$ 615	$ 528	$ 1,811	$ 1,610
NET INCOME PER SHARE, BASIC	$ 1.08	$ 0.88	$ 3.13	$ 2.66
NET INCOME PER SHARE, DILUTED	$ 1.08	$ 0.88	$ 3.13	$ 2.66
COMPREHENSIVE INCOME	$ 729	$ 655	$ 2,229	$ 1,797
BASIC WEIGHTED AVERAGE SHARES OUTSTANDING
Basic	569	597	578	605
DILUTED WEIGHTED AVERAGE SHARES OUTSTANDING
Diluted	569	598	579	606
Cash dividends declared per common share	$ 0.160	$ 0.125	$ 0.445	$ 0.350
Passenger
OPERATING REVENUE:
Operating Revenue	$ 5,194	$ 4,944	$ 15,137	$ 14,869
Freight
OPERATING REVENUE:
Operating Revenue	43	42	130	128
Other
OPERATING REVENUE:
Operating Revenue	$ 338	$ 317	$ 994	$ 891