Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net income (loss)	$ 480	$ (341)
Defined benefit pension plans and retiree medical:
Amortization of actuarial gain and prior service cost	(45)	(33)
Derivative financial instruments:
Change in fair value	(67)	(15)
Reclassification into earnings	7	(1)
Unrealized gain (loss) on investments:
Net change in value	2	(1)
Other comprehensive loss before tax	(103)	(50)
Non-cash tax provision	0	0
Comprehensive income (loss)	377	(391)
AA [Member]
Net income (loss)	401	(253)
Defined benefit pension plans and retiree medical:
Amortization of actuarial gain and prior service cost	(44)	(33)
Derivative financial instruments:
Change in fair value	(67)	(15)
Reclassification into earnings	7	(1)
Unrealized gain (loss) on investments:
Net change in value	2	(1)
Other comprehensive loss before tax	(102)	(50)
Non-cash tax provision	0	0
Comprehensive income (loss)	$ 299	$ (303)