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Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 31, 2019
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Convertible Preferred Stock Our board of directors has authorized 100 million shares of convertible preferred stock, $0.001 par value, issuable in series. As of December 31, 2018 and 2019, no shares were issued or outstanding. Class A and Class B Common Stock and Class C Capital Stock Our board of directors has authorized three classes of stock, Class A and Class B common stock, and Class C capital stock. The rights of the holders of each class of our common and capital stock are identical, except with respect to voting. Each share of Class A common stock is entitled to one vote per share. Each share of Class B common stock is entitled to 10 votes per share. Class C capital stock has no voting rights, except as required by applicable law. Shares of Class B common stock may be converted at any time at the option of the stockholder and automatically convert upon sale or transfer to Class A common stock. Share Repurchases In January 2018, the board of directors of Alphabet authorized the company to repurchase up to $8.6 billion of its Class C capital stock. In January and July 2019, the board of directors of Alphabet authorized the company to repurchase up to an additional $12.5 billion and $25.0 billion of its Class C capital stock, respectively. Share repurchases pursuant to the January 2018 and January 2019 authorizations were completed in 2019. 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 years ended December 31, 2018 and 2019, we repurchased and subsequently retired 8.2 million shares of Alphabet Class C capital stock for an aggregate amount of $9.1 billion and 15.3 million shares of Alphabet Class C capital stock for an aggregate amount of $18.4 billion, respectively.