Changes in Equity and Noncontrolling Interests (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			$ 2,442,182	$ 2,184,786
Balance at beginning of period			(117,004)
Net income	161,389	148,800	469,870	417,941
Other comprehensive income	31,256	20,777	(3,390)	7,167
Payments to shareholders of noncontrolling interest			(4,371)	(4,713)
Purchase of noncontrolling interest	288		288
Purchase of treasury stock			(296,975)	(229,442)
Stock options exercised, including tax benefit			98,009	90,217
Dividends declared	(31,629)	(16,964)	(65,101)	(50,905)
Stock-based compensation expense			26,584	23,167
Balance at end of period	2,666,520	2,438,218	2,666,520	2,438,218
Balance at end of period	(120,686)		(120,686)
Common Stock
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period (in shares)			160	163
Balance at beginning of period			160	163
Retirement of treasury stock			(4)	(4)
Retirement of treasury stock (in shares)			(4)	(4)
Stock options exercised, including tax benefit			2	3
Stock options exercised, including tax benefit (in shares)			2	3
Balance at end of period (in shares)	158	162	158	162
Balance at end of period	158	162	158	162
Additional Paid-in Capital
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			336,683	189,166
Purchase of noncontrolling interest			662
Stock options exercised, including tax benefit			98,007	90,214
Stock-based compensation expense			26,584	23,167
Balance at end of period	461,936	302,547	461,936	302,547
Accumulated Earnings
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			2,210,120	2,102,497
Net income			467,793	414,955
Retirement of treasury stock			(296,971)	(229,438)
Dividends declared			(65,101)	(50,905)
Balance at end of period	2,315,841	2,237,109	2,315,841	2,237,109
Accum. Other Comprehensive Loss
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			(117,004)	(120,057)
Other comprehensive income			(3,970)	7,080
Purchase of noncontrolling interest			288
Balance at end of period	(120,686)	(112,977)	(120,686)	(112,977)
Treasury Stock
Increase (Decrease) In Shareholders' Equity
Purchase of treasury stock			(296,975)	(229,442)
Retirement of treasury stock			(296,975)	(229,442)
Noncontrolling Interests
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			12,223	13,017
Net income			2,077	2,986
Other comprehensive income			292	87
Payments to shareholders of noncontrolling interest			(4,371)	(4,713)
Purchase of noncontrolling interest			(950)
Balance at end of period	$ 9,271	$ 11,377	$ 9,271	$ 11,377