Loss per Share (Weighted Average Shares Outstanding) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ (78)	$ (581)	$ (194)	$ (1,547)
Weighted Average Shares Outstanding, Basic and Diluted (in shares)		70	70	70
Loss Per Share, Basic & Diluted (in dollars per share)	$ (1.11)	$ (8.30)	$ (2.77)	$ (22.10)