Information about Segments and Geographic Areas (Stock-based Compensation and Depreciation, Amortization and Impairment by Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Stock-based compensation expense	$ 3,190	$ 2,769
Depreciation, amortization and impairment	3,108	2,613
Operating Segments | Google
Segment Reporting Information [Line Items]
Stock-based compensation expense	2,988	2,612
Depreciation, amortization and impairment	3,013	2,529
Operating Segments | Other Bets
Segment Reporting Information [Line Items]
Stock-based compensation expense	135	123
Depreciation, amortization and impairment	92	84
Reconciling items
Segment Reporting Information [Line Items]
Stock-based compensation expense	67	34
Depreciation, amortization and impairment	$ 3	$ 0