Consolidated Statements of Equity (Deficit) (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared per common share (USD per share)	$ 0.77	$ 0.67	$ 1.54	$ 1.34
Net income (loss) attributable to noncontrolling interest	$ 51	$ 46	$ 103	$ 95