Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Class B Common Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance at Dec. 31, 2020	$ 886			$ 1,253	$ 389	$ (34)	$ (722)
Beginning balance, shares at Dec. 31, 2020		12,799,999	140,775,221				(18,844,614)
Net income (loss)	(120)				(120)
Other comprehensive income (loss), net of tax	(9)					(9)
Issuance of common stock related to exercises of options and vesting of RSUs	8			8
Issuance of common stock related to exercises of options and vesting of RSUs, shares			2,642,786
Purchase of capped calls, net of tax of $9 million (Note 6)	(26)			(26)
Withholding taxes on net share settlements of equity awards	(29)			(29)
Stock-based compensation	69			69
Ending balance at Jun. 30, 2021	779			1,275	269	(43)	$ (722)
Ending balance, shares at Jun. 30, 2021		12,799,999	143,418,007				(18,844,614)
Beginning balance at Mar. 31, 2021	785			1,244	309	(46)	$ (722)
Beginning balance, shares at Mar. 31, 2021		12,799,999	142,914,851				(18,844,614)
Net income (loss)	(40)				(40)
Other comprehensive income (loss), net of tax	3					3
Issuance of common stock related to exercises of options and vesting of RSUs	1			1
Issuance of common stock related to exercises of options and vesting of RSUs, shares			503,156
Withholding taxes on net share settlements of equity awards	(6)			(6)
Stock-based compensation	36			36
Ending balance at Jun. 30, 2021	779			1,275	269	(43)	$ (722)
Ending balance, shares at Jun. 30, 2021		12,799,999	143,418,007				(18,844,614)
Beginning balance at Dec. 31, 2021	$ 789			1,326	241	(56)	$ (722)
Beginning balance, shares at Dec. 31, 2021	125,812,035	12,799,999	144,656,649				(18,844,614)
Net income (loss)	$ (3)				(3)
Other comprehensive income (loss), net of tax	(28)					(28)
Issuance of common stock related to exercises of options and vesting of RSUs, shares			1,191,072
Withholding taxes on net share settlements of equity awards	(9)			(9)
Stock-based compensation	47			47
Ending balance at Jun. 30, 2022	$ 796			1,364	238	(84)	$ (722)
Ending balance, shares at Jun. 30, 2022	127,003,107	12,799,999	145,847,721				(18,844,614)
Beginning balance at Mar. 31, 2022	$ 767			1,342	207	(60)	$ (722)
Beginning balance, shares at Mar. 31, 2022		12,799,999	145,636,700				(18,844,614)
Net income (loss)	31				31
Other comprehensive income (loss), net of tax	(24)					(24)
Issuance of common stock related to exercises of options and vesting of RSUs, shares			211,021
Withholding taxes on net share settlements of equity awards	(1)			(1)
Stock-based compensation	23			23
Ending balance at Jun. 30, 2022	$ 796			$ 1,364	$ 238	$ (84)	$ (722)
Ending balance, shares at Jun. 30, 2022	127,003,107	12,799,999	145,847,721				(18,844,614)