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Cover Page - USD ($) $ in Billions	12 Months Ended
Cover Page - USD ($) $ in Billions	Dec. 31, 2019	Jan. 27, 2020	Jun. 28, 2019
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-37580
Entity Registrant Name	Alphabet Inc.
Entity Central Index Key	0001652044
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	61-1767919
Entity Address, Address Line One	1600 Amphitheatre Parkway
Entity Address, City or Town	Mountain View
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94043
City Area Code	650
Local Phone Number	253-000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 663.0
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the registrant’s Proxy Statement for the 2020 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2019.
Class A Common Stock
Document Information [Line Items]
Title of 12(b) Security	Class A Common Stock, $0.001 par value
Trading Symbol	GOOGL
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		299,895,185
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		46,411,073
Class C Capital Stock
Document Information [Line Items]
Title of 12(b) Security	Class C Capital Stock, $0.001 par value
Trading Symbol	GOOG
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		340,979,832