Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Stockholders' Equity [Abstract]
Net earnings attributable to noncontrolling interests	$ 1	$ 1	$ 3	$ 3
Dividends declared (usd per share)	$ 0.84	$ 0.80	$ 2.44	$ 2.2