Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Numerator
Net income	$ 3,688	$ 2,940	$ 1,500
Less: Net income attributable to participating securities	19	15	9
Net income attributable to common stockholders	$ 3,669	$ 2,925	$ 1,491
Denominator
Number of shares used for basic EPS computation (in shares)	2,803	2,614	2,420
Basic EPS (in dollars per share)	$ 1.31	$ 1.12	$ 0.62
Numerator
Net income attributable to common stockholders	$ 3,669	$ 2,925	$ 1,491
Denominator
Number of shares used for basic EPS computation (in shares)	2,803	2,614	2,420
Number of shares used for diluted EPS computation (in shares)	2,853	2,664	2,517
Diluted EPS (in dollars per share)	$ 1.29	$ 1.10	$ 0.60
Class A Common Stock
Numerator
Net income	$ 2,959	$ 2,308	$ 1,114
Less: Net income attributable to participating securities	15	12	7
Net income attributable to common stockholders	$ 2,944	$ 2,296	$ 1,107
Denominator
Weighted average shares outstanding (in shares)	2,259	2,059	1,803
Less: Shares subject to repurchase (in shares)	10	6	5
Number of shares used for basic EPS computation (in shares)	2,249	2,053	1,798
Basic EPS (in dollars per share)	$ 1.31	$ 1.12	$ 0.62
Numerator
Net income attributable to common stockholders	$ 2,944	$ 2,296	$ 1,107
Reallocation of net income attributable to participating securities	19	15	9
Reallocation of net income as a result of conversion of Class B to Class A common stock	725	629	384
Reallocation of net income to Class B common stock	0	0	0
Net income attributable to common stockholders for diluted EPS	$ 3,688	$ 2,940	$ 1,500
Denominator
Number of shares used for basic EPS computation (in shares)	2,249	2,053	1,798
Conversion of Class B to Class A common stock (in shares)	554	561	622
Shares subject to repurchase (in shares)	5	7	7
Number of shares used for diluted EPS computation (in shares)	2,853	2,664	2,517
Diluted EPS (in dollars per share)	$ 1.29	$ 1.10	$ 0.60
Class A Common Stock | Restricted Stock Units (RSUs)
Denominator
Share based payment arrangements (in shares)	37	30	25
Class A Common Stock | Employee Stock Option
Denominator
Share based payment arrangements (in shares)	8	13	65
Class B Common Stock
Numerator
Net income	$ 729	$ 632	$ 386
Less: Net income attributable to participating securities	4	3	2
Net income attributable to common stockholders	$ 725	$ 629	$ 384
Denominator
Weighted average shares outstanding (in shares)	559	568	631
Less: Shares subject to repurchase (in shares)	5	7	9
Number of shares used for basic EPS computation (in shares)	554	561	622
Basic EPS (in dollars per share)	$ 1.31	$ 1.12	$ 0.62
Numerator
Net income attributable to common stockholders	$ 725	$ 629	$ 384
Reallocation of net income attributable to participating securities	0	0	0
Reallocation of net income as a result of conversion of Class B to Class A common stock	0	0	0
Reallocation of net income to Class B common stock	15	23	39
Net income attributable to common stockholders for diluted EPS	$ 740	$ 652	$ 423
Denominator
Number of shares used for basic EPS computation (in shares)	554	561	622
Conversion of Class B to Class A common stock (in shares)	0	0	0
Shares subject to repurchase (in shares)	2	4	7
Number of shares used for diluted EPS computation (in shares)	573	591	709
Diluted EPS (in dollars per share)	$ 1.29	$ 1.10	$ 0.60
Class B Common Stock | Restricted Stock Units (RSUs)
Denominator
Share based payment arrangements (in shares)	9	13	15
Class B Common Stock | Employee Stock Option
Denominator
Share based payment arrangements (in shares)	8	13	65