XML 56 R65.htm IDEA: XBRL DOCUMENT

Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance at end of period	$ (738)	$ (3)
Fuel derivatives
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance at beginning of period	(20)	(103)
Changes in fair value	(1,191)	(82)
Reclassification to earnings	34	165
Balance at end of period	(1,177)	(20)
Interest rate derivatives
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance at beginning of period	(58)	(108)
Changes in fair value	(10)	22
Reclassification to earnings	23	28
Balance at end of period	(45)	(58)
Defined benefit plan items
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance at beginning of period	65	26
Changes in fair value	(24)	39
Reclassification to earnings	0	0
Balance at end of period	41	65
Other
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance at beginning of period	8	(8)
Changes in fair value	0	16
Reclassification to earnings	0	0
Balance at end of period	8	8
Deferred tax
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance at beginning of period	2	74
Changes in fair value	454	0
Reclassification to earnings	(21)	(72)
Balance at end of period	435	2
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]
Balance at beginning of period	(3)	(119)
Changes in fair value	(771)	(5)
Reclassification to earnings	36	121
Balance at end of period	$ (738)	$ (3)