Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]
Net earnings attributable to noncontrolling interests	$ 1	$ 1	$ 2	$ 2
Dividends declared (usd per share)	$ 0.80	$ 0.70	$ 1.60	$ 1.40