Consolidated Statements Of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Comprehensive Income [Abstract]
Net Earnings (Loss)	$ 220	$ (241)	$ (122)	$ (1,900)
Defined benefit pension plans and retiree medical:
Amortization of actuarial (gain) loss and prior service cost	(33)	57	(66)	113
Current year change	0	0	0	0
Benefit plan modifications	0	0	0	0
Derivative financial instruments:
Change in fair value	(41)	(104)	(56)	(56)
Reclassification into earnings	13	1	12	(25)
Amounts reclassified from accumulated other comprehensive income (loss)	20		54
Unrealized gain (loss) on investments
Net change in value	1	0	0	2
Other comprehensive income (loss) before reclassifications			(56)
Other Comprehensive Income (Loss) Before Tax	(60)	(46)	(110)	34
Income tax expense on other comprehensive income	0	0	0	0
Comprehensive Income (Loss)	$ 160	$ (287)	$ (232)	$ (1,866)