Stockholders' Equity (Deficit) - Additional Information (Details) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 29, 2018	Dec. 31, 2015
Information regarding repurchase of Class A common stock
Treasury stock, number of shares held					56,118,260
Class A common stock
Stockholders’ Equity (Deficit)
Maximum amount authorized for common stock repurchase under common stock repurchase program	$ 1.0
Amount authorized for common stock repurchase under common stock repurchase program				$ 1.0
Information regarding repurchase of Class A common stock
Dollar value of shares repurchased	$ 1.0
Total number of shares repurchased	0	0	0
Number of treasury stock shares retired			56,118,260