Employee Stock Plans (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Status of Senior Executive Plans

	Year ended December 31,
	2014					2013					2012
	Shares			Fair Value		Shares			Fair Value		Shares			Fair Value
	(in millions)			(per share)		(in millions)			(per share)		(in millions)			(per share)
Balance, at beginning of year		—		$	—		—		$	—		—		$	—
Granted		1.5			18		1.7			16		1.6			14
Vested (1)		(0.8	)		24		(0.8	)		19		(0.6	)		16
Forfeited/expired		(0.7	)		24		(0.9	)		19		(1.0	)		16
Balance, at end of year		—			—		—			—		—		—
Issued in calendar year (1)		0.4			19		0.3			19		0.8			16
___________

(1) Shares that vest at December 31 of each year are issued to the employees in the first quarter of the following year, although the requisite service period is complete. Accordingly, the 0.4 million shares issued in 2014 include shares vested at December 31, 2013, after adjusting for shares withheld to meet employee tax requirements. The shares withheld for employee tax requirements were valued at $6.1 million, $5.5 million and $9.5 million, for 2014, 2013 and 2012, respectively.