Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 3,488	$ 2,244	$ 2,181
Unrealized gain (loss) on defined benefit plan items, net of deferred taxes of $2, ($13), and ($7)	3	(23)	(12)
Other, net of deferred taxes of $5, $5, and $-	8	9	(2)
OTHER COMPREHENSIVE INCOME (LOSS)	335	728	(313)
COMPREHENSIVE INCOME	3,823	2,972	1,868
Fuel derivatives
Unrealized gain (loss) on derivatives, net of tax	317	735	(308)
Interest rate derivatives
Unrealized gain (loss) on derivatives, net of tax	$ 7	$ 7	$ 9