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Stockholders' Equity - Common Share Repurchases, Issuances and Dividends Paid (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Equity, Class of Treasury Stock [Line Items]
Average purchase price per share	$ 17.02		$ 15.05	$ 14.61
Remaining common stock repurchase authority	$ 300	$ 665	$ 300	$ 665
Shares repurchased related to employee stock-based compensation plans	600,000		2,800,000	900,000
Average purchase price per share	$ 17.28		$ 12.99	$ 13.66
Common shares issued	600,000	100,000	4,300,000	2,400,000
Dividends paid	$ 27	$ 31	$ 56	$ 62
Dividends per common share	$ 0.16	$ 0.16	$ 0.32	$ 0.32
Common Stock Shares Outstanding [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased, shares	11,800,000		19,900,000	23,000,000.0
Common stock repurchased, value	$ 200		$ 300	$ 335
Shares repurchased related to employee stock-based compensation plans	559,580	4,125	2,795,238	904,402
Common shares issued	641,126	90,689	4,265,712	2,362,243

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