CONSOLIDATED STATEMENTS OF CHANGES IN 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 income (loss) attributable to redeemable noncontrolling interest	$ (2)	$ (1)	$ (2)	$ 0
Dividends declared per common share (in dollars per share)	$ 0.34	$ 0.32	$ 0.98	$ 0.92