Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) - USD ($) $ / shares in Units, $ in Millions		2 Months Ended	3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Basic earnings per share:
Net income (loss) from continuing operations			$ (35)	$ (123)	$ (144)	$ (290)
Less: undistributed earnings allocated to participating securities			0	0	0	0
Net income (loss) from continuing operations available to common shareholders			(35)	(123)	(144)	(290)
Net income (loss) from discontinued operations		$ 1	1	0	1	0
Net income (loss)			$ (34)	$ (123)	$ (143)	$ (290)
Basic weighted average shares	[1]		49,878,191	49,552,796	49,779,681	49,434,177
Continuing operations			$ (0.68)	$ (2.49)	$ (2.88)	$ (5.87)
Discontinued operations			0.01	0	0.01	0
Net income (loss) per share - basic			$ (0.67)	$ (2.49)	$ (2.87)	$ (5.87)
Diluted earnings per share:
Net income (loss) from continuing operations			$ (35)	$ (123)	$ (144)	$ (290)
Less: undistributed earnings allocated to participating securities			0	0	0	0
Net income (loss) from continuing operations available to common shareholders			(35)	(123)	(144)	(290)
Net income (loss) from discontinued operations		$ 1	1	0	1	0
Net income (loss)			$ (34)	$ (123)	$ (143)	$ (290)
Diluted weighted average shares			49,878,191	49,552,796	49,779,681	49,434,177
Continuing operations			$ (0.68)	$ (2.49)	$ (2.88)	$ (5.87)
Discontinued operations			0.01	0	0.01	0
Net income (loss) per share -diluted			$ (0.67)	$ (2.49)	$ (2.87)	$ (5.87)
Potentially dilutive securities excluded from the calculation of diluted EPS because of antidilutive affect			5,000,000	4,900,000	5,000,000	4,900,000

[1] Includes 0.8 million and 0.9 million of participating securities that met the service condition and were eligible to receive nonforfeitable dividends or dividend equivalents for each of the three months and nine months ended September 30, 2022 and 2021, respectively.