Revenue Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 17,737	$ 15,077
United States and Canada
Disaggregation of Revenue [Line Items]
Revenue	8,012	6,777
Europe
Disaggregation of Revenue [Line Items]
Revenue	4,150	3,624
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenue	3,971	3,337
Rest of World
Disaggregation of Revenue [Line Items]
Revenue	1,604	1,339
United States
Disaggregation of Revenue [Line Items]
Revenue	7,550	6,360
Advertising
Disaggregation of Revenue [Line Items]
Revenue	17,440	14,912
Other revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 297	$ 165

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Name:	us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration