Condensed Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income (loss)	$ 864	$ 220	$ 1,343	$ (122)
Other comprehensive loss before tax:
Defined benefit pension plans and retiree medical	(59)	(33)	(104)	(66)
Derivative financial instruments:
Change in fair value	13	(41)	(54)	(56)
Reclassification into earnings	5	13	12	12
Net unrealized gain (loss) on investments:
Net change in value	0	1	2	0
Other comprehensive loss before tax	(41)	(60)	(144)	(110)
Reversal of non-cash tax provision	330	0	330	0
Comprehensive income (loss)	1,153	160	1,529	(232)
AA [Member]
Net income (loss)	265	228	666	(25)
Other comprehensive loss before tax:
Defined benefit pension plans and retiree medical	(58)	(33)	(102)	(66)
Derivative financial instruments:
Change in fair value	15	(41)	(52)	(56)
Reclassification into earnings	5	13	12	12
Net unrealized gain (loss) on investments:
Net change in value	(2)	1	0	0
Other comprehensive loss before tax	(40)	(60)	(142)	(110)
Reversal of non-cash tax provision	328	0	328	0
Comprehensive income (loss)	$ 553	$ 168	$ 852	$ (135)