Earnings Per Share (Schedule Of Reconciliation Of The Amounts Included In The Computation Of Basic Earnings Per Share From Continuing Operations And Diluted Earnings Per Share From Continuing Operations) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income		$ 2	$ 19	$ 54	$ 27	$ 21	$ 81
Weighted-average common shares outstanding		121.5		127.4		121.5	129.3
Effect of dilutive securities:
Weighted-average common shares outstanding-assuming dilution		121.7		127.8		121.7	129.8
Basic earnings per share		$ 0.02		$ 0.42		$ 0.17	$ 0.62
Diluted earnings per share		$ 0.02		$ 0.42		$ 0.17	$ 0.62
Antidilutive securities excluded from computation of diluted earnings per share (in shares)		0.4		0.1		0.4	0.1
RSUs [Member]
Effect of dilutive securities:
Dilutive securities		0.1		0.3		0.1	0.3
Stock Options [Member]
Effect of dilutive securities:
Dilutive securities	[1]	0.1		0.2		0.1	0.2

[1] Options to purchase 0.4 million and 0.1 million shares for the three months ended June 30, 2022 and 2021, respectively and 0.4 million and 0.1 million shares for the six months ended June 30, 2022, and 2021, respectively were not included in the diluted earnings per share calculation because their effect would have been anti-dilutive.