Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Comprehensive Income (Loss) [Abstract]
Net earnings	$ 443	$ 363
Other comprehensive income (loss), net of tax:
Cumulative translation adjustments	8	5
Amortization of net actuarial loss and prior service cost	11	8
Unrealized gain (loss) on securities	1	1
Total other comprehensive income (loss), net of tax	3	19
Comprehensive income (loss)	446	382
Continuing Operations [Member]
Other comprehensive income (loss), net of tax:
Total other comprehensive income (loss), net of tax	20	14
Discontinued Operations [Member]
Other comprehensive income (loss), net of tax:
Total other comprehensive income (loss), net of tax	$ (17)	$ 5