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Stockholders' Equity	9 Months Ended
Stockholders' Equity	Sep. 30, 2020
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Share Repurchases In July 2019, the Board of Directors of Alphabet authorized the company to repurchase up to $25.0 billion of its Class C capital stock, which was completed during the third quarter of 2020. In July 2020, the Board of Directors of Alphabet authorized the company to repurchase up to an additional $28.0 billion of its Class C capital stock. As of September 30, 2020, $25.5 billion remains available for repurchase. The repurchases are being executed from time to time, subject to general business and market conditions and other investment opportunities, through open market purchases or privately negotiated transactions, including through Rule 10b5-1 plans. The repurchase program does not have an expiration date. During the three and nine months ended September 30, 2020, we repurchased and subsequently retired 5.2 million and 16.8 million shares of Alphabet Class C capital stock for an aggregate amount of $7.9 billion and $23.2 billion, respectively.