Stockholders' Equity (Summary Of Restricted Stock Activity) (Details) - Jun. 30, 2015 - USD ($) $ / shares in Units, $ in Millions	Total
Weighted-Average Grant Date Fair Value
Unrecognized compensation cost for stock options and restricted stock	$ 1,009
Weighted-average remaining recognition period	1 year 7 months 10 days
Restricted Stock | Class A Common Stock
Number of Units
Outstanding, number of shares	12,585,000
Granted, number of shares	5,170,000
Vested, number of shares	(2,813,000)
Forfeited, number of shares	(872,000)
Outstanding, number of shares	14,070,000
Weighted-Average Grant Date Fair Value
Outstanding, weighted-average grant date fair value (USD per share)	$ 88.88
Granted, weighted-average grant date fair value (USD per share)	87.04
Vested, weighted-average grant date fair value (USD per share)	85.20
Forfeited, weighted-average grant date fair value (USD per share)	86.89
Outstanding, weighted-average grant date fair value (USD per share)	$ 87.70
Fair value of restricted stock-based awards, vested	$ 240
Aggregate intrinsic value	$ 1,206
Minimum | Performance Stock Units (PSUs) | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock units to Class A common stock, conversion ratio	0.5
Maximum | Performance Stock Units (PSUs) | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance stock units to Class A common stock, conversion ratio	2.0