Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Allowance for credit losses	$ 32	$ 25
Property and equipment, net, accumulated depreciation	347	319
Intangible assets, accumulated amortization	184	173
Other long-term assets, allowance for credit losses	$ 5	$ 0
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	1,600,000,000	1,600,000,000
Common stock, shares issued	140,412,251	138,698,307
Common stock, shares outstanding	121,567,637	124,581,773
Treasury stock, shares	18,844,614	14,116,534
Class B Common Stock
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	12,799,999	12,799,999
Common stock, shares outstanding	12,799,999	12,799,999