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Earnings (Loss) per Common Share - Schedule of Earnings (Loss) per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net income	$ 185	$ 125	$ 555	$ 19
Denominator:
Weighted average shares used to compute basic EPS	174	194	178	197
Effect of dilutive securities:
Dilutive effect of stock options, restricted stock, restricted stock units, performance stock units, and Employee Stock Purchase Plan ("ESPP")	2	1	2	1
Dilutive potential common shares	2	1	2	1
Weighted average shares used to compute diluted EPS	176	195	180	198
Basic earnings per common share	$ 1.07	$ 0.65	$ 3.12	$ 0.10
Diluted earnings per common share	$ 1.05	$ 0.64	$ 3.08	$ 0.10

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