Income Taxes - Components of Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Deferred revenue	$ 274	$ 119
Tax attributes carryforwards	123	93
Share-based compensation	51	54
Deferred tax assets, intangible assets	1,287	1,289
Capitalized software development expenses	21	67
Other	160	156
Deferred tax assets	1,916	1,778
Valuation allowance	(228)	(181)
Deferred tax assets, net of valuation allowance	1,688	1,597
Deferred tax liabilities:
Intangibles	(147)	(142)
U.S. deferred taxes on foreign earnings	(577)	(594)
Other	(63)	(73)
Deferred tax liabilities	(787)	(809)
Net deferred tax assets	$ 901	$ 788