Business Combination - Summary of Pro Forma Financial Information (Detail) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares	[1]
Business Combinations [Abstract]
Pro forma revenue | $	$ 2,353
Pro forma net income attributable to common stockholders | $	$ 39
Pro forma net income per share attributable to common stockholders
Basic | $ / shares	$ 0.22
Diluted | $ / shares	$ 0.21
Shares used in the computation of net income per share
Basic | shares	181	[2]
Diluted | shares	188	[2]

[1] Adjustments, net of tax, included in the pro forma net income above that were of a non-recurring nature totaled $15 million. The adjustments reflect the elimination of (1) restructuring and integration costs ($13 million); and (2) transaction costs ($2 million). These pro forma results exclude the effect of adjustments to the opening balance sheet associated with fair value purchase accounting estimates.

[2] Pro forma net income per share was calculated using weighted average basic shares outstanding during the three months ended March 31, 2019. Due to the net loss for the three months ended March 31, 2019, the effects of restricted stock, warrants and redeemable preferred stock were not included in the calculation of diluted earnings per share. For the presentation of the pro forma net income for the three months ended March 31, 2018, diluted shares includes the impact of restricted stock and warrants but does not include the impact of the redeemable preferred stock, as those shares were antidilutive