Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income	$ 754	$ 421	$ 178
Unrealized gain (loss) on defined benefit plan items, net of deferred taxes of $15, ($11), and $0	24	(17)	0
Other, net of deferred taxes of $7, $3, and $1	9	3	3
OTHER COMPREHENSIVE INCOME	116	105	38
COMPREHENSIVE INCOME	870	526	216
Fuel derivatives
Unrealized gain (loss) on derivatives, net of tax	52	120	67
Interest rate derivatives
Unrealized gain (loss) on derivatives, net of tax	$ 31	$ (1)	$ (32)