CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Millions	Total	Cumulative effect of adoption of accounting standards updates	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative effect of adoption of accounting standards updates	Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2018			62,949	(17,317)
Balance, beginning of period at Dec. 31, 2018	$ 8,785		$ 0	$ (14,711)	$ 5,445	$ 18,367		$ (316)
Increase (Decrease) in Stockholders' Equity
Net income	4,865					4,865
Foreign currency translation adjustments, net of tax	(10)							(10)
Net unrealized gains on available-for-sale securities, net of tax	135							135
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			230
Exercise of stock options and vesting of restricted stock units and performance share units	$ 3		$ 0		3
Repurchase of common stock (in shares)	(4,445)			(4,445)
Repurchase of common stock	$ (8,153)			$ (8,153)
Stock-based compensation and other stock-based payments	308				308
Balance (in shares) at Dec. 31, 2019			63,179	(21,762)
Balance, end of period at Dec. 31, 2019	5,933	$ (3)	$ 0	$ (22,864)	5,756	23,232	$ (3)	(191)
Increase (Decrease) in Stockholders' Equity
Net income	59					59
Foreign currency translation adjustments, net of tax	50							50
Net unrealized gains on available-for-sale securities, net of tax	23							23
Issuance of convertible senior notes	96				96
Conversion of debt	(245)				(245)
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			227
Exercise of stock options and vesting of restricted stock units and performance share units	$ 6		$ 0		6
Repurchase of common stock (in shares)	(685)			(685)
Repurchase of common stock	$ (1,264)			$ (1,264)
Stock-based compensation and other stock-based payments	238				238
Balance (in shares) at Dec. 31, 2020			63,406	(22,447)
Balance, end of period at Dec. 31, 2020	4,893		$ 0	$ (24,128)	5,851	23,288		(118)
Increase (Decrease) in Stockholders' Equity
Net income	1,165					1,165
Foreign currency translation adjustments, net of tax	(57)							(57)
Net unrealized gains on available-for-sale securities, net of tax	31							31
Conversion of debt	(86)				(86)
Exercise of stock options and vesting of restricted stock units and performance share units (in shares)			178
Exercise of stock options and vesting of restricted stock units and performance share units	$ 5		$ 0		5
Repurchase of common stock (in shares)	(71)			(71)
Repurchase of common stock	$ (162)			$ (162)
Stock-based compensation and other stock-based payments	389				389
Balance (in shares) at Dec. 31, 2021			63,584	(22,518)
Balance, end of period at Dec. 31, 2021	$ 6,178		$ 0	$ (24,290)	$ 6,159	$ 24,453		$ (144)