Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Comprehensive Income (Loss) [Abstract]
Net earnings	$ 427	$ 395	$ 790	$ 597
Other comprehensive income (loss), net of tax:
Cumulative translation adjustments	(21)	6	(11)	19
Amortization of net actuarial loss (gain)	7	8	15	15
Unrealized gain (loss) on securities	0	0	1	0
Other comprehensive income (loss), net of tax	(14)	14	5	34
Comprehensive income (loss)	$ 413	$ 409	$ 795	$ 631