Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2012

Equity Incentive Plans

Assumptions used to determine the fair value of options granted

	2012		2011		2010
Weighted average expected term		9.0 years		7.9 years		7.8 years
Expected volatility		20.2 - 53.9%		22.1 - 53.9%		23.7 - 52.3%
Weighted average volatility		34.6%		35.1%		35.1%
Expected dividends		2.2 - 3.0%		2.5 - 3.7%		2.4 - 2.8%
Weighted average expected dividends		2.8%		2.7%		2.6%
Risk-free rate		0.0 - 2.2%		0.0 - 3.5%		0.1 - 3.9%

Summary of option activity

	Number (in 000s)			Weighted average exercise price		Aggregate intrinsic value (in 000s)		Weighted average remaining contractual term (years)
Outstanding as of January 1, 2012		33,947		$	39.00
Granted		3,727			31.62
Exercised		(4,113	)		24.00
Forfeited		(619	)		29.86
Expired		(3,299	)		43.81
Outstanding as of December 31, 2012		29,643			39.81	$	193,556		5.1
Outstanding, net of expected forfeitures		29,371			39.89		191,143		5.1
Outstanding, exercisable ("vested")		18,840			46.07		71,729		3.5

Changes in restricted stock units

	Number (in 000s)			Weighted average grant date fair value
Nonvested as of January 1, 2012		4,326		$	28.76
Granted		1,253			31.89
Vested		(939	)		40.13
Forfeited		(188	)		28.15
Nonvested as of December 31, 2012		4,452			27.27

Changes in performance stock units

	Number (in 000s)			Weighted average grant date fair value
Nonvested as of January 1, 2012		—		$	—
Granted		460			31.41
Vested		—			—
Forfeited		(23	)		31.00
Nonvested as of December 31, 2012		437			31.43