Information about Segments and Geographic Areas (Capital Expenditures by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Capital expenditures	$ 5,406	$ 6,732	$ 16,802	$ 17,496
Operating Segments | Google
Segment Reporting Information [Line Items]
Capital expenditures	5,465	7,228	15,964	18,658
Operating Segments | Other Bets
Segment Reporting Information [Line Items]
Capital expenditures	120	71	320	195
Reconciling Items
Segment Reporting Information [Line Items]
Capital expenditures	$ (179)	$ (567)	$ 518	$ (1,357)