Stock-Based Compensation Plans (Details 2) (USD $)	9 Months Ended
	Sep. 30, 2011 years
Summary of options outstanding by plan and range of exercise price
Shares Under Options Outstanding	4,399,653
Weighted Average Exercise Price of Option Outstanding	$ 38.12
Remaining Contractual Life of Options Outstanding, Years	3.44
$20.02 - $30.74
Summary of options outstanding by plan and range of exercise price
Options outstanding, Exercise Prices, Lower limit	$ 20.02
Options outstanding, Exercise Prices, Upper limit	$ 30.74
Shares Under Options Outstanding	987,607
Weighted Average Exercise Price of Option Outstanding	$ 26.83
Remaining Contractual Life of Options Outstanding, Years	1.77
$30.89 - $40.93
Summary of options outstanding by plan and range of exercise price
Options outstanding, Exercise Prices, Lower limit	$ 30.89
Options outstanding, Exercise Prices, Upper limit	$ 40.93
Shares Under Options Outstanding	3,061,503
Weighted Average Exercise Price of Option Outstanding	$ 37.36
Remaining Contractual Life of Options Outstanding, Years	3.96
$42.72 - $51.82
Summary of options outstanding by plan and range of exercise price
Options outstanding, Exercise Prices, Lower limit	$ 42.72
Options outstanding, Exercise Prices, Upper limit	$ 51.82
Shares Under Options Outstanding	3,883
Weighted Average Exercise Price of Option Outstanding	$ 51.02
Remaining Contractual Life of Options Outstanding, Years	0.45
$53.06 - $62.97
Summary of options outstanding by plan and range of exercise price
Options outstanding, Exercise Prices, Lower limit	$ 53.06
Options outstanding, Exercise Prices, Upper limit	$ 62.97
Shares Under Options Outstanding	41,219
Weighted Average Exercise Price of Option Outstanding	$ 53.94
Remaining Contractual Life of Options Outstanding, Years	2.90
$64.52 - $71.82
Summary of options outstanding by plan and range of exercise price
Options outstanding, Exercise Prices, Lower limit	$ 64.52
Options outstanding, Exercise Prices, Upper limit	$ 71.82
Shares Under Options Outstanding	8,671
Weighted Average Exercise Price of Option Outstanding	$ 67.53
Remaining Contractual Life of Options Outstanding, Years	4.05
$73.39 - $80.47
Summary of options outstanding by plan and range of exercise price
Options outstanding, Exercise Prices, Lower limit	$ 73.39
Options outstanding, Exercise Prices, Upper limit	$ 80.47
Shares Under Options Outstanding	294,102
Weighted Average Exercise Price of Option Outstanding	$ 80.22
Remaining Contractual Life of Options Outstanding, Years	3.71
$81.19 - $89.59
Summary of options outstanding by plan and range of exercise price
Options outstanding, Exercise Prices, Lower limit	$ 81.19
Options outstanding, Exercise Prices, Upper limit	$ 89.59
Shares Under Options Outstanding	2,668
Weighted Average Exercise Price of Option Outstanding	$ 85.39
Remaining Contractual Life of Options Outstanding, Years	2.81