Condensed Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income	$ 942	$ 289	$ 2,285	$ 167
Other comprehensive loss before tax:
Defined benefit pension plans and retiree medical	(38)	(33)	(142)	(99)
Derivative financial instruments:
Change in fair value	0	22	(54)	(34)
Reclassification into earnings	(7)	11	5	23
Net unrealized gain (loss) on investments:
Net change in value	(2)	0	0	0
Other comprehensive loss before tax	(47)	0	(191)	(110)
Reversal of non-cash tax provision	0	0	330	0
Comprehensive income	895	289	2,424	57
AA [Member]
Net income	465	290	1,132	265
Other comprehensive loss before tax:
Defined benefit pension plans and retiree medical	(37)	(33)	(139)	(99)
Derivative financial instruments:
Change in fair value	0	22	(52)	(34)
Reclassification into earnings	(7)	11	5	23
Net unrealized gain (loss) on investments:
Net change in value	(2)	(3)	(2)	(3)
Other comprehensive loss before tax	(46)	(3)	(188)	(113)
Reversal of non-cash tax provision	0	0	328	0
Comprehensive income	$ 419	$ 287	$ 1,272	$ 152