Shareholders' Equity (Deficiency) (Shareholders' Equity Activity) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance	$ 937	$ 2,916
Net Income (Loss)	(110)	(958)
Noncontrolling Interest, Change in Redemption Value	(2)
Other Comprehensive Income (Loss), Net of Tax	(4)	(95)
Balance, ending balance	821	1,863
Capital in Excess of Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance		2,897
Balance, ending balance	2,897	2,897
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance		(26)
Net Income (Loss)	(116)	(966)
Balance, ending balance	(2,063)	(992)
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance		9
Other Comprehensive Income (Loss), Net of Tax	(4)	(95)
Balance, ending balance	(47)	(86)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance		36
Net Income (Loss)	6	8
Noncontrolling Interest, Change in Redemption Value	(2)
Balance, ending balance	$ 34	$ 44