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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net income $ 2,244 $ 2,181 $ 1,136
Unrealized loss on defined benefit plan items, net of deferred taxes of ($13), ($7), and ($8) (23) (12) (16)
Other, net of deferred taxes of $5, $-, and $- 9 (2) 0
OTHER COMPREHENSIVE INCOME (LOSS) 728 (313) (735)
COMPREHENSIVE INCOME 2,972 1,868 401
Fuel derivatives      
Unrealized gain (loss) on derivatives, net of tax 735 (308) (727)
Interest rate derivatives      
Unrealized gain (loss) on derivatives, net of tax $ 7 $ 9 $ 8