Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement Of Income And Comprehensive Income [Abstract]
Net earnings (loss)	$ (1,926)	$ (1,965)	$ (469)
Defined benefit pension plans and retiree medical:
Amortization of actuarial loss and prior service cost	130	130	138
Current year change	(1,910)	(1,216)	(385)
Benefit plan modifications	3,345
Derivative financial instruments:
Change in fair value	(12)	190	72
Reclassification into earnings	(3)	(313)	144
Unrealized gain (loss) on investments
Net change in value	6	(1)	(1)
Other Comprehensive Income (Loss) Before Tax	1,556	(1,210)	(32)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	569	0	0
Comprehensive Income (Loss)	$ (939)	$ (3,175)	$ (501)