CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Net loss attributable to redeemable noncontrolling interest	$ (2)	$ 1	$ 3
Dividends declared per common share (in dollars per share)	$ 1.32	$ 1.24	$ 1.16