Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2011

Equity Incentive Plans

Assumptions used to determine the fair value of options granted

	2011		2010		2009
Weighted average expected term		7.9 years		7.8 years		8.1 years
Expected volatility		22.1 - 53.9%		23.7 - 52.3%		26.3 - 79.2%
Weighted average volatility		35.1%		35.1%		38.3%
Expected dividends		2.5 - 3.7%		2.4 - 2.8%		2.6%
Weighted average expected dividends		2.7%		2.6%		2.6%
Risk-free rate		0.0 - 3.5%		0.1 - 3.9%		0.0 - 3.7%

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, 2011		35,296		$	39.39
Granted		4,177			31.57
Exercised		(1,080	)		17.87
Forfeited		(1,230	)		28.69
Expired		(3,216	)		44.69
Outstanding as of December 31, 2011:		33,947			39.00	$	71,171		5.1
Outstanding, net of expected forfeitures		33,645			39.08		70,686		5.0
Outstanding, exercisable ("vested")		21,417			45.26		28,243		3.5

Changes in restricted stock units

	Number (in 000s)			Weighted average grant date fair value
Nonvested as of January 1, 2011		3,757		$	31.50
Granted		1,366			31.38
Vested		(417	)		61.66
Forfeited		(380	)		29.08
Nonvested as of December 31, 2011		4,326			28.76