Earnings Per Share - Reconciliation of Weighted Average Number of Shares of Common Stock Outstanding In Calculating EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income (loss)	$ (80)	$ (16)
Denominator:
Weighted average shares used to compute Basic EPS	135,746	136,240
Weighted average effect of dilutive securities:
Weighted average shares used to compute Diluted EPS	135,746	136,240
Basic EPS	$ (0.59)	$ (0.12)
Diluted EPS	$ (0.59)	$ (0.12)