Statement of Changes in Consolidated Equity (unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Non-controlling Interest [Member]
Balance at Dec. 31, 2019	$ 5,886	$ 2	$ 9,639	$ (555)	$ (4,974)	$ 1,774
Net income	139			80		59
Other comprehensive income (loss) (G)	(189)				76	(265)
Stock-based compensation	8		8
Distributions	(31)					(31)
Other	(2)			(1)		(1)
Balance at Mar. 31, 2020	5,811	2	9,647	(476)	(4,898)	1,536
Balance at Dec. 31, 2020	5,016	2	9,663	(725)	(5,629)	1,705
Net income	219			175		44
Other comprehensive income (loss) (G)	(311)				(249)	(62)
Stock-based compensation	8		8
Common stock issued: compensation plans	4		4
Distributions	(62)					(62)
Other	(1)		(1)
Balance at Mar. 31, 2021	$ 4,873	$ 2	$ 9,674	$ (550)	$ (5,878)	$ 1,625