CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Comprehensive income:
Net earnings	$ 1,027	$ 506	$ 1,826
Other comprehensive income (loss):
Foreign currency translation adjustments	25	(97)	(50)
Changes in unamortized net pension and other postretirement benefit gain (loss), net of tax expense (benefit) of ($151) in 2016, $131 in 2015, and ($323) in 2014	(269)	282	(554)
Changes in unamortized prior service cost, net of tax benefit of $0 in 2016, $1 in 2015 and $64 in 2014	(4)	(4)	(103)
Unrealized gains on available-for-sale securities	1	0	0
Total comprehensive income	$ 780	$ 687	$ 1,119