Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,020	$ 1,647	$ 1,439
Other comprehensive income (loss), net of tax
Marketable securities	(4)	0	(3)
Pension plans	(2)	(13)	17
Unrealized gains (losses) on designated hedges	4	20	(9)
Financial statement translation	210	(129)	(390)
Total other comprehensive income (loss), net of tax	208	(122)	(385)
Comprehensive income	$ 1,228	$ 1,525	$ 1,054