Shareholders' Equity (Deficiency) (Shareholders' Equity Activity) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance	$ 2,916	$ (3,666)
Net Income (Loss)	(958)	(477)
Other Comprehensive Income	(95)	33
Dividends Paid to Noncontrolling Interests		(5)
Equity Awards Granted, Vested and Exercised		8
Other		1
Balance, ending balance	1,863	(4,106)
Par Value of Issued Shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance	0	1
Balance, ending balance	0	1
Capital in Excess of Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance	2,897	6,711
Equity Awards Granted, Vested and Exercised		8
Balance, ending balance	2,897	6,719
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance	(26)	(8,671)
Net Income (Loss)	(966)	(481)
Balance, ending balance	(992)	(9,152)
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance	9	(1,746)
Other Comprehensive Income	(95)	33
Balance, ending balance	(86)	(1,713)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance	36	39
Net Income (Loss)	8	4
Dividends Paid to Noncontrolling Interests		(5)
Other		1
Balance, ending balance	$ 44	$ 39