Revenues (Revenue by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 38,297	$ 38,944	$ 79,456	$ 75,283
Hedging gains (losses)	151	108	200	245
Google
Segment Reporting Information [Line Items]
Revenue	37,998	38,674	78,973	74,706
Google | Google Search & other
Segment Reporting Information [Line Items]
Revenue	21,319	23,642	45,821	46,189
Google | YouTube ads
Segment Reporting Information [Line Items]
Revenue	3,812	3,603	7,850	6,628
Google | Google properties
Segment Reporting Information [Line Items]
Revenue	25,131	27,245	53,671	52,817
Google | Google Network Members' properties
Segment Reporting Information [Line Items]
Revenue	4,736	5,249	9,959	10,264
Google | Google advertising
Segment Reporting Information [Line Items]
Revenue	29,867	32,494	63,630	63,081
Google | Google Cloud
Segment Reporting Information [Line Items]
Revenue	3,007	2,100	5,784	3,925
Google | Google other
Segment Reporting Information [Line Items]
Revenue	5,124	4,080	9,559	7,700
Other Bets
Segment Reporting Information [Line Items]
Revenue	$ 148	$ 162	$ 283	$ 332