Discontinued Operations - Summary of Assets and Liabilities (Details) - Classifieds - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 31	$ 23
Accounts receivable, net	113	117
Other current assets	34	30
Long-term investments	32	32
Property and equipment, net	34	31
Goodwill	454	465
Intangible assets, net	35	35
Operating lease right-of-use assets	23	20
Deferred tax assets	415	435
Total assets classified as held for sale in the condensed consolidated balance sheet	1,171	1,188
Accounts payable	37	18
Accrued expenses and other current liabilities	100	104
Deferred revenue	5	4
Income taxes payable	37	35
Operating lease liabilities	14	11
Deferred tax liabilities	268	278
Other liabilities	2	2
Total liabilities classified as held for sale in the condensed consolidated balance sheet	$ 463	$ 452