Net Income Per Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	1 Months Ended	3 Months Ended			6 Months Ended
	May. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Apr. 02, 2015
Numerator
Less: Adjustment Payment to Class C capital stockholders		$ (522)		$ 0	$ (522)	$ 0
Allocation of undistributed earnings - continuing operations		3,931	$ 3,515	3,419	7,446	6,988
Allocation of undistributed earnings - discontinued operations		0		(68)	0	(266)
Net income		3,931	$ 3,515	$ 3,351	7,446	$ 6,722
Denominator
Continuing operations (in dollars per share)			$ 5.16	$ 5.06		$ 10.37
Net income per share - basic (in dollars per share)			$ 5.16	$ 4.96		$ 9.98
Numerator
Adjustment Payment to Class C capital stockholders		(522)		$ 0	(522)	$ 0
Allocation of undistributed earnings - continuing operations		3,931	$ 3,515	3,419	7,446	6,988
Allocation of undistributed earnings - discontinued operations		0		$ (68)	0	$ (266)
Weighted-average effect of dilutive securities
Continuing operations (in dollars per share)			$ 5.10	$ 4.98		$ 10.19
Net income per share - diluted (in dollars per share)			$ 5.10	$ 4.88		$ 9.80
Class C adjustment payment							$ 522
Adjustment Payment to Class C capital stockholders					47	$ 0
Class A Common Stock
Numerator
Less: Adjustment Payment to Class C capital stockholders		0		$ 0	0	0
Allocation of undistributed earnings - continuing operations		1,440		1,429	2,921	2,916
Allocation of undistributed earnings - discontinued operations		0		(28)	0	(111)
Net income		$ 1,440		$ 1,401	$ 2,921	$ 2,805
Denominator
Number of shares used in basic computation		288,723		282,216	287,800	281,160
Continuing operations (in dollars per share)		$ 4.99		$ 5.06	$ 10.15	$ 10.37
Discontinued operations (in dollars per share)		0.00		(0.10)	0.00	(0.39)
Net income per share - basic (in dollars per share)		$ 4.99		$ 4.96	$ 10.15	$ 9.98
Numerator
Adjustment Payment to Class C capital stockholders		$ 0		$ 0	$ 0	$ 0
Allocation of undistributed earnings - continuing operations		1,440		1,429	2,921	2,916
Allocation of undistributed earnings - discontinued operations		$ 0		$ (28)	$ 0	$ (111)
Denominator
Number of shares used in basic computation		288,723		282,216	287,800	281,160
Weighted-average effect of dilutive securities
Conversion of Class B to Class A common shares outstanding		52,114		55,300	52,480	55,702
Employee stock options		1,546		2,010	1,619	2,216
Restricted stock units and other contingently issuable shares		807		3,104	922	3,499
Number of shares used in per share computation		343,190		342,630	342,821	342,577
Continuing operations (in dollars per share)		$ 4.93		$ 4.98	$ 10.03	$ 10.19
Discontinued operations (in dollars per share)		0.00		(0.10)	0.00	(0.39)
Net income per share - diluted (in dollars per share)		$ 4.93		$ 4.88	$ 10.03	$ 9.80
Class A Common Stock | Continuing Operations
Numerator
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares		$ 260		$ 280	$ 533	$ 578
Reallocation of undistributed earnings		(7)		(2)	(15)	(3)
Allocation of undistributed earnings		1,693		1,707	3,439	3,491
Class A Common Stock | Discontinued operations
Numerator
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares		0		(6)	0	(22)
Reallocation of undistributed earnings		0		0	0	0
Allocation of undistributed earnings		0		(34)	0	(133)
Class B Common Stock
Numerator
Less: Adjustment Payment to Class C capital stockholders		0		0	0	0
Allocation of undistributed earnings - continuing operations		260		280	533	578
Allocation of undistributed earnings - discontinued operations		0		(6)	0	(22)
Net income		$ 260		$ 274	$ 533	$ 556
Denominator
Number of shares used in basic computation		52,114		55,300	52,480	55,702
Continuing operations (in dollars per share)		$ 4.99		$ 5.06	$ 10.15	$ 10.37
Discontinued operations (in dollars per share)		0.00		(0.10)	0.00	(0.39)
Net income per share - basic (in dollars per share)		$ 4.99		$ 4.96	$ 10.15	$ 9.98
Numerator
Adjustment Payment to Class C capital stockholders		$ 0		$ 0	$ 0	$ 0
Allocation of undistributed earnings - continuing operations		260		280	533	578
Allocation of undistributed earnings - discontinued operations		$ 0		$ (6)	$ 0	$ (22)
Denominator
Number of shares used in basic computation		52,114		55,300	52,480	55,702
Weighted-average effect of dilutive securities
Conversion of Class B to Class A common shares outstanding		0		0	0	0
Employee stock options		0		0	0	0
Restricted stock units and other contingently issuable shares		0		0	0	0
Number of shares used in per share computation		52,114		55,300	52,480	55,702
Continuing operations (in dollars per share)		$ 4.93		$ 4.98	$ 10.03	$ 10.19
Discontinued operations (in dollars per share)		0.00		(0.10)	0.00	(0.39)
Net income per share - diluted (in dollars per share)		$ 4.93		$ 4.88	$ 10.03	$ 9.80
Class B Common Stock | Continuing Operations
Numerator
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares		$ 0		$ 0	$ 0	$ 0
Reallocation of undistributed earnings		(3)		(5)	(7)	(10)
Allocation of undistributed earnings		257		275	526	568
Class B Common Stock | Discontinued operations
Numerator
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares		0		0	0	0
Reallocation of undistributed earnings		0		1	0	0
Allocation of undistributed earnings		0		(5)	0	(22)
Class C Capital Stock
Numerator
Less: Adjustment Payment to Class C capital stockholders		522		0	522	0
Allocation of undistributed earnings - continuing operations		1,709		1,710	3,470	3,494
Allocation of undistributed earnings - discontinued operations		0		(34)	0	(133)
Net income		$ 2,231		$ 1,676	$ 3,992	$ 3,361
Denominator
Number of shares used in basic computation		342,780		337,599	341,986	336,989
Continuing operations (in dollars per share)		$ 6.51		$ 5.06	$ 11.68	$ 10.37
Discontinued operations (in dollars per share)		0.00		(0.10)	0.00	(0.39)
Net income per share - basic (in dollars per share)		$ 6.51		$ 4.96	$ 11.68	$ 9.98
Numerator
Adjustment Payment to Class C capital stockholders		$ 522		$ 0	$ 522	$ 0
Allocation of undistributed earnings - continuing operations		1,709		1,710	3,470	3,494
Allocation of undistributed earnings - discontinued operations		$ 0		$ (34)	$ 0	$ (133)
Denominator
Number of shares used in basic computation		342,780		337,599	341,986	336,989
Weighted-average effect of dilutive securities
Conversion of Class B to Class A common shares outstanding		0		0	0	0
Employee stock options		1,502		2,004	1,577	2,210
Restricted stock units and other contingently issuable shares		3,406		4,130	3,805	4,012
Number of shares used in per share computation		347,688		343,733	347,368	343,211
Continuing operations (in dollars per share)		$ 6.43		$ 4.98	$ 11.53	$ 10.19
Discontinued operations (in dollars per share)		0.00		(0.10)	0.00	(0.39)
Net income per share - diluted (in dollars per share)		$ 6.43		$ 4.88	$ 11.53	$ 9.80
Stock issued in connection with the Adjustment Payment to Class C Capital stockholders (shares)	853
Adjustment Payment to Class C capital stockholders	$ 47
Class C Capital Stock | Continuing Operations
Numerator
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares		$ 0		$ 0	$ 0	$ 0
Reallocation of undistributed earnings		7		2	15	3
Allocation of undistributed earnings		1,716		1,712	3,485	3,497
Class C Capital Stock | Discontinued operations
Numerator
Reallocation of undistributed earnings as a result of conversion of Class B to Class A shares		0		0	0	0
Reallocation of undistributed earnings		0		0	0	0
Allocation of undistributed earnings		$ 0		$ (34)	$ 0	$ (133)