Consolidated Statements Of Equity (Deficit) - USD ($) shares in Thousands, $ in Millions	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Common Stock [Member]	Total
Balance at Dec. 31, 2019	$ 27	$ 4,815	$ (8,573)	$ (650)	$ (13)	$ (4,394)
Balance (in shares) at Dec. 31, 2019	106,025				(894)
Stock plans		1				1
Stock plans (in shares)					(143)
Net income (loss)			(186)			(186)
Other comprehensive income, net of tax				86		86
Balance at Mar. 31, 2020	$ 27	4,816	(8,759)	(564)	$ (13)	(4,493)
Balance (in shares) at Mar. 31, 2020	106,025				(1,037)
Balance at Dec. 31, 2020	$ 27	4,817	(8,975)	(755)	$ (14)	(4,900)
Balance (in shares) at Dec. 31, 2020	106,025				(1,232)
Stock plans					$ (1)	(1)
Stock plans (in shares)					(122)
Net income (loss)			60			60
Other comprehensive income, net of tax				11		11
Balance at Mar. 31, 2021	$ 27	$ 4,817	$ (8,915)	$ (744)	$ (15)	$ (4,830)
Balance (in shares) at Mar. 31, 2021	106,025				(1,354)