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Earnings per Common Share - Schedule of Earnings per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income	$ 153	$ 83	$ 281	$ 210
Denominator:
Weighted average shares used to compute basic EPS	235	265	239	264
Effect of dilutive securities:
Dilutive effect of stock options, restricted stock, restricted stock units, performance stock units, and Employee Stock Purchase Plan (“ESPP”)	3	4	3	5
Dilutive potential common shares	3	4	3	5
Weighted average shares used to compute diluted EPS	238	269	242	269
Basic earnings per common share	$ 0.65	$ 0.31	$ 1.17	$ 0.79
Diluted earnings per common share	$ 0.64	$ 0.31	$ 1.16	$ 0.78

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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