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Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 26, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 59	$ 75	$ (76)	$ (21)	$ (9)	$ 8	$ (11)	$ 48	$ 37	$ 36	$ 405
Shares used in computing basic earnings per share									125,348	122,722	122,499
Effect of dilutive securities:
Dilutive effect of common stock equivalents									976	516	125
Shares used in computing diluted earnings per share									126,324	123,238	122,624
Earnings per share:
Basic	$ 0.45	$ 0.61	$ (0.62)	$ (0.17)	$ (0.07)	$ 0.07	$ (0.09)	$ 0.39	$ 0.30	$ 0.29	$ 3.31
Diluted	$ 0.44	$ 0.60	$ (0.62)	$ (0.17)	$ (0.07)	$ 0.06	$ (0.09)	$ 0.39	$ 0.29	$ 0.29	$ 3.30

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