Discontinued Operations - Summary of Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents		$ 52
Accounts receivable, net		9
Other current assets		80
Total current assets of discontinued operations		141
Long-term investments		11
Property and equipment, net		26
Goodwill		224
Intangible assets, net		5
Operating lease right-of-use assets		29
Deferred tax assets		8
Other assets		3
Total long-term assets of discontinued operations		306
Accounts payable		19
Accrued expenses and other current liabilities		215
Deferred revenue		23
Income taxes payable		2
Total current liabilities of discontinued operations		259
Operating lease liabilities		20
Other liabilities		6
Total long-term liabilities of discontinued operations		26
Classifieds
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents	$ 30	22
Accounts receivable, net	116	136
Other current assets	31	37
Long-term investments	30	30
Property and equipment, net	27	24
Goodwill	443	396
Intangible assets, net	33	23
Operating lease right-of-use assets	18	16
Deferred tax assets	388	389
Total assets classified as held for sale in the condensed consolidated balance sheet	1,116	1,073
Short-term debt	0	2
Accounts payable	23	22
Accrued expenses and other current liabilities	109	92
Deferred revenue	6	6
Income taxes payable	43	41
Operating lease liabilities	12	11
Deferred tax liabilities	300	291
Other liabilities	3	3
Total liabilities classified as held for sale in the condensed consolidated balance sheet	$ 496	$ 468