Earnings per Share - Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Denominator
Number of shares used for basic EPS computation (in shares)	2,850	2,855	2,851	2,855
Basic EPS (in dollars per share)	$ 1.82	$ 0.92	$ 3.54	$ 1.77
Denominator
Number of shares used for diluted EPS computation (in shares)	2,879	2,875	2,876	2,873
Diluted EPS (in dollars per share)	$ 1.80	$ 0.91	$ 3.51	$ 1.76
Class A Common Stock
Numerator
Net income	$ 4,371	$ 2,204	$ 8,509	$ 4,241
Denominator
Number of shares used for basic EPS computation (in shares)	2,406	2,405	2,407	2,400
Basic EPS (in dollars per share)	$ 1.82	$ 0.92	$ 3.54	$ 1.77
Numerator
Net income	$ 4,371	$ 2,204	$ 8,509	$ 4,241
Reallocation of net income as a result of conversion of Class B to Class A common stock	807	412	1,572	804
Reallocation of net income to Class B common stock	0	0	0	0
Net income for diluted EPS	$ 5,178	$ 2,616	$ 10,081	$ 5,045
Denominator
Conversion of Class B to Class A common stock (in shares)	444	450	444	455
Weighted average effect of dilutive RSUs and employee stock options (in shares)	29	20	25	18
Number of shares used for diluted EPS computation (in shares)	2,879	2,875	2,876	2,873
Diluted EPS (in dollars per share)	$ 1.80	$ 0.91	$ 3.51	$ 1.76
Class B Common Stock
Numerator
Net income	$ 807	$ 412	$ 1,572	$ 804
Denominator
Number of shares used for basic EPS computation (in shares)	444	450	444	455
Basic EPS (in dollars per share)	$ 1.82	$ 0.92	$ 3.54	$ 1.77
Numerator
Net income	$ 807	$ 412	$ 1,572	$ 804
Reallocation of net income as a result of conversion of Class B to Class A common stock	0	0	0	0
Reallocation of net income to Class B common stock	(8)	(2)	(13)	(3)
Net income for diluted EPS	$ 799	$ 410	$ 1,559	$ 801
Denominator
Conversion of Class B to Class A common stock (in shares)	0	0	0	0
Weighted average effect of dilutive RSUs and employee stock options (in shares)	0	0	0	1
Number of shares used for diluted EPS computation (in shares)	444	450	444	456
Diluted EPS (in dollars per share)	$ 1.80	$ 0.91	$ 3.51	$ 1.76