Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (USD per share)	$ 2.35	$ 2.17	$ 2.00
Net earnings attributable to noncontrolling interests	$ 5	$ 5	$ 3