CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Class A Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2017			53,236,095
Beginning Balance at Dec. 31, 2017	$ 834	$ 19	$ 1	$ 257	$ (620)	$ 1,248	$ 19	$ (52)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of treasury shares related to share-based compensation plans, net of forfeitures (in shares)			704,137
Issuances of treasury shares related to share-based compensation plans, net of forfeitures	10			(8)	18
Shares withheld to fund withholding tax obligations related to share-based compensation plans (in shares)			(69,048)
Shares withheld to fund withholding tax obligations related to share-based compensation plans	(11)				(11)
Share-based compensation	45			45
Net income	421					421
Changes in unrealized gains and losses on anticipated sales hedging transactions (net of income taxes)	21							21
Changes in unrealized gains and losses on forward interest rate swap hedging transactions (net of income taxes)	9							9
Foreign currency translation adjustment	(13)							(13)
Ending Balance (in shares) at Dec. 31, 2018			53,871,184
Ending Balance at Dec. 31, 2018	1,335		$ 1	294	(613)	1,688		(35)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of treasury shares related to share-based compensation plans, net of forfeitures (in shares)			594,399
Issuances of treasury shares related to share-based compensation plans, net of forfeitures	11			(3)	14
Shares withheld to fund withholding tax obligations related to share-based compensation plans (in shares)			(224,765)
Shares withheld to fund withholding tax obligations related to share-based compensation plans	(43)				(43)
Share-based compensation	48			48
Repurchase of common stock (in shares)			(237,886)
Repurchase of common stock	(47)				(47)
Net income	544					544
Changes in unrealized gains and losses on anticipated sales hedging transactions (net of income taxes)	(10)							(10)
Foreign currency translation adjustment	1							1
Ending Balance (in shares) at Dec. 31, 2019			54,002,932
Ending Balance at Dec. 31, 2019	1,839		$ 1	339	(689)	2,232		(44)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of treasury shares related to share-based compensation plans, net of forfeitures (in shares)			557,599
Issuances of treasury shares related to share-based compensation plans, net of forfeitures	12			5	7
Shares withheld to fund withholding tax obligations related to share-based compensation plans (in shares)			(149,709)
Shares withheld to fund withholding tax obligations related to share-based compensation plans	(37)				(37)
Share-based compensation	51			51
Repurchase of common stock (in shares)			(948,740)
Repurchase of common stock	(200)				(200)
Net income	504					504
Changes in unrealized gains and losses on anticipated sales hedging transactions (net of income taxes)	(30)							(30)
Foreign currency translation adjustment	5							5
Ending Balance (in shares) at Dec. 31, 2020			53,462,082
Ending Balance at Dec. 31, 2020	$ 2,144		$ 1	$ 395	$ (919)	$ 2,736		$ (69)