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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2015

Stockholders' Equity Note [Abstract]

The following table summarizes stock repurchase activity during the three and six months ended June 30, 2015 and 2014 (aggregate purchase price in millions, shares in thousands):



	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2015		2014		2015		2014
Aggregate purchase price	$	412	$	238	$	850	$	407
Class A common shares repurchased	4,750		2,488		10,116		4,255
Weighted-average price per share	$	86.71	$	95.73	$	84.02	$	95.67

The following table summarizes stock repurchase authorizations that remain open as of June 30, 2015 (amounts in table in millions):



Authorization Date	Amount Authorized	Expiration Date	Status
January 27, 2015	$1,000	December 31, 2017	Open
August 6, 2014	$1,000	December 31, 2016	Open

Summary of Stock Option Activity

The following table summarizes stock option activity since January 1, 2015 (shares in thousands):



	Number of Shares		Weighted- Average Exercise Price (per share)
Outstanding, January 1, 2015	5,869		$	50.54
Granted	13		84.68
Forfeited	(130	)	61.28
Exercised	(2,085	)	30.67
Outstanding, June 30, 2015	3,667		61.60

Summary of Restricted Stock Activity

The following table summarizes restricted stock activity since January 1, 2015 (units in thousands):



	Number of Units		Weighted- Average Grant Date Fair Value (per unit)
Outstanding, January 1, 2015	12,585		$	88.88
Granted	5,170		87.04
Vested	(2,813	)	85.20
Forfeited	(872	)	86.89
Outstanding, June 30, 2015	14,070		87.70

Schedule of Accumulated Other Comprehensive Income

The changes in components of accumulated other comprehensive income (loss) during the six months ended June 30, 2015 and 2014 were as follows (tables in millions):



	Unrealized Gain on Available-for-Sale Securities		Unrealized Loss on Cash Flow Hedges			Total
Balance, January 1, 2015	$	—	$	(1	)	$	(1	)
Unrealized gain (loss), net of taxes of $0	1		(3		)	(2		)
Balance, June 30, 2015	$	1	$	(4	)	$	(3	)



	Unrealized Gain on Available-for-Sale Securities		Total
Balance, January 1, 2014	$	4	$	4
Unrealized gain, net of taxes of $2	4		4
Balance, June 30, 2014	$	8	$	8