Earnings per Share - Basic Earnings per share reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Income (Loss) from Continuing Operations, Per Basic Share	$ (0.04)	$ (0.09)	$ (0.54)	$ (6.52)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ (7)	$ (16)	$ (107)	$ (1,353)
Preferred Stock Dividends and Other Adjustments	(2)	(2)	(7)	(7)
Adjusted Net Income Available to Common Shareholders, Common	$ (9)	$ (18)	$ (114)	$ (1,360)
Weighted Average Number of Shares Outstanding, Basic	209,244	209,626	209,958	208,741