Loss per Share (Weighted Average Shares Outstanding) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ (95)	$ (174)	$ (289)	$ (1,721)
Weighted Average Shares Outstanding, Basic and Diluted (in shares)	70	70	70	70
Loss Per Share, Basic & Diluted (in dollars per share)	$ (1.36)	$ (2.48)	$ (4.13)	$ (24.58)