Stock-Based Compensation Plans (Details 6) (USD $)	12 Months Ended
	Dec. 31, 2011 years
Summary of options outstanding by plan and range of exercise price
Shares	4,255,985
Weighted Average Exercise Price	$ 38.17
Remaining Contractual Life	3.25
$20.02-$30.74 [Member]
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	959,752
Weighted Average Exercise Price	$ 26.88
Remaining Contractual Life	1.50
$30.89-$40.93 [Member]
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	2,962,802
Weighted Average Exercise Price	$ 37.42
Remaining Contractual Life	3.79
$42.72-$51.82 [Member]
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	415
Weighted Average Exercise Price	$ 44.35
Remaining Contractual Life	2.16
$53.06-$62.97 [Member]
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	33,215
Weighted Average Exercise Price	$ 54.11
Remaining Contractual Life	3.34
$64.52-$71.82 [Member]
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	6,670
Weighted Average Exercise Price	$ 68.44
Remaining Contractual Life	4.99
$73.38-$80.47 [Member]
Summary of options outstanding by plan and range of exercise price
Options outstanding, Exercise Prices, Lower limit	$ 73.38
Options outstanding, Exercise Prices, Upper limit	$ 80.47
Shares	291,797
Weighted Average Exercise Price	$ 80.22
Remaining Contractual Life	3.44
$81.19-$89.59 [Member]
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	1,334
Weighted Average Exercise Price	$ 81.19
Remaining Contractual Life	5.33