Stock Transactions (Option Activity Under The Company's Stock Plans) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Stock Transactions [Abstract]
Outstanding at beginning of year, Shares	34,820		38,794	44,168
Outstanding at beginning of year, Weighted Average Exercise Price	$ 30.31		$ 27.57	$ 25.25
Granted, Shares	3,807		4,425	5,120
Granted, Weighted Average Exercise Price	$ 50.02		$ 38.26	$ 28.59
Exercised, Shares	(4,488)		(7,028)	(8,642)
Exercised, Weighted Average Exercise Price	$ 25.73		$ 19.49	$ 14.28
Cancelled, Shares	(1,685)		(1,371)	(1,852)
Cancelled, Weighted Average Exercise Price	$ 35.62		$ 33.62	$ 37.15
Outstanding at end of year, Shares	32,454		34,820	38,794
Outstanding at end of year, Weighted Average Exercise Price	$ 32.98		$ 30.31	$ 27.57
Outstanding at December 31, 2011, Weighted Average Remaining Contractual Term (in Years)	5
Outstanding at December 31, 2011, Aggregate Intrinsic Value	$ 467,272
Vested and Expected to Vest at December 31, 2011, Shares	31,679	[1]
Vested and Expected to Vest at December 31, 2011, Weighted Average Exercise Price	$ 32.75	[1]
Vested and Expected to Vest at December 31, 2011, Weighted Average Remaining Contractual Term (in Years)	5	[1]
Vested and Expected to Vest at December 31, 2011, Aggregate Intrinsic Value	462,537	[1]
Exercisable at December 31, 2011, Shares	19,232
Exercisable at December 31, 2011, Weighted Average Exercise Price	$ 28.71
Exercisable at December 31, 2011, Weighted Average Remaining Contractual Term (in Years)	4
Exercisable at December 31, 2011, Aggregate Intrinsic Value	$ 352,544

[1] The "Expected to Vest" options are the net unvested options that remain after applying the pre-vesting forfeiture rate assumption to total unvested options.