Stock-Based Compensation Plans (Details 2) (USD $)	6 Months Ended
	Jun. 30, 2011
Summary of options outstanding by plan and range of exercise price
Shares Under Options Outstanding	4,586,717
Weighted Average Exercise Price of Option Outstanding	$ 38.08
Remaining Contractual Life of Options Outstanding	3.64
$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	1,045,122
Weighted Average Exercise Price of Option Outstanding	$ 26.54
Remaining Contractual Life of Options Outstanding	2.02
$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	3,160,440
Weighted Average Exercise Price of Option Outstanding	$ 37.30
Remaining Contractual Life of Options Outstanding	4.17
$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	0.70
$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	54,559
Weighted Average Exercise Price of Option Outstanding	$ 56.15
Remaining Contractual Life of Options Outstanding	3.02
$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	9,042
Weighted Average Exercise Price of Option Outstanding	$ 67.50
Remaining Contractual Life of Options Outstanding	5.24
$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	311,003
Weighted Average Exercise Price of Option Outstanding	$ 80.17
Remaining Contractual Life of Options Outstanding	3.81
$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	6.09