UNAUDITED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Millions	Total	Cumulative Effect of Adoption of Accounting Standards Update	Common Stock	Treasury Stock	Additional Paid-in Capital	Additional Paid-in Capital Cumulative Effect of Adoption of Accounting Standards Update	Retained Earnings	Retained Earnings Cumulative Effect of Adoption of Accounting Standards Update	Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2020			63,406	(22,447)
Balance at Dec. 31, 2020	$ 4,893		$ 0	$ (24,128)	$ 5,851		$ 23,288		$ (118)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(222)						(222)
Foreign currency translation adjustments	(22)								(22)
Losses on cash flow hedges	0
Net unrealized gains on available-for-sale securities, net of tax	97								97
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			169
Exercise of stock options and vesting of restricted stock units and performance share units	$ 4		$ 0		4
Repurchase of common stock (in shares)	(68)			(68)
Repurchase of common stock	$ (155)			$ (155)
Stock-based compensation and other stock-based payments	209				209
Reclassification adjustment for convertible debt in mezzanine	(5)				(5)
Balance (in shares) at Jun. 30, 2021			63,575	(22,515)
Balance at Jun. 30, 2021	4,799		$ 0	$ (24,283)	6,059		23,066		(43)
Balance (in shares) at Mar. 31, 2021			63,562	(22,511)
Balance at Mar. 31, 2021	4,764		$ 0	$ (24,274)	5,965		23,233		(160)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(167)						(167)
Foreign currency translation adjustments	8								8
Losses on cash flow hedges	11								11
Net unrealized gains on available-for-sale securities, net of tax	98								98
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			13
Exercise of stock options and vesting of restricted stock units and performance share units	$ 3		$ 0		3
Repurchase of common stock (in shares)	(4)			(4)
Repurchase of common stock	$ (9)			$ (9)
Stock-based compensation and other stock-based payments	96				96
Reclassification adjustment for convertible debt in mezzanine	(5)				(5)
Balance (in shares) at Jun. 30, 2021			63,575	(22,515)
Balance at Jun. 30, 2021	4,799		$ 0	$ (24,283)	6,059		23,066		(43)
Balance (in shares) at Dec. 31, 2021			63,584	(22,518)
Balance at Dec. 31, 2021	6,178	$ (66)	$ 0	$ (24,290)	6,159	$ (96)	24,453	$ 30	(144)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	157						157
Foreign currency translation adjustments	(108)								(108)
Losses on cash flow hedges	0
Net unrealized gains on available-for-sale securities, net of tax	0
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			182
Exercise of stock options and vesting of restricted stock units and performance share units	$ 5		$ 0		5
Repurchase of common stock (in shares)	(1,100)			(1,100)
Repurchase of common stock	$ (2,374)			$ (2,374)
Stock-based compensation and other stock-based payments	210				210
Balance (in shares) at Jun. 30, 2022			63,766	(23,618)
Balance at Jun. 30, 2022	4,002		$ 0	$ (26,664)	6,278		24,640		(252)
Balance (in shares) at Mar. 31, 2022			63,759	(23,005)
Balance at Mar. 31, 2022	4,373		$ 0	$ (25,390)	6,163		23,783		(183)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	857						857
Foreign currency translation adjustments	(70)								(70)
Losses on cash flow hedges	0
Net unrealized gains on available-for-sale securities, net of tax	1								1
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			7
Exercise of stock options and vesting of restricted stock units and performance share units	$ 2		$ 0		2
Repurchase of common stock (in shares)	(613)			(613)
Repurchase of common stock	$ (1,274)			$ (1,274)
Stock-based compensation and other stock-based payments	113				113
Balance (in shares) at Jun. 30, 2022			63,766	(23,618)
Balance at Jun. 30, 2022	$ 4,002		$ 0	$ (26,664)	$ 6,278		$ 24,640		$ (252)