Changes in Equity and Noncontrolling Interests (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 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	154,868	141,893	308,481	269,141
Other comprehensive income	(9,967)	(30,036)	(34,646)	(13,610)
Payments to shareholders of noncontrolling interests			(1,736)	(1,650)
Purchase of treasury stock			(181,108)	(201,020)
Stock options exercised, including tax benefit			80,380	44,707
Dividends declared	(16,713)	(16,889)	(33,468)	(33,938)
Stock-based compensation expense			17,175	15,101
Balance at end of period	2,597,260	2,263,517	2,597,260	2,263,517
Balance at end of period	(151,798)		(151,798)
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			(2)	(3)
Retirement of treasury stock (in shares)			(2)	(3)
Stock options exercised, including tax benefit			2	1
Stock options exercised, including tax benefit (in shares)			2	1
Balance at end of period (in shares)	160	161	160	161
Balance at end of period	160	161	160	161
Additional Paid-in Capital
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			336,683	189,166
Stock options exercised, including tax benefit			80,378	44,706
Stock-based compensation expense			17,175	15,101
Balance at end of period	434,236	248,973	434,236	248,973
Accumulated Earnings
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			2,210,120	2,102,497
Net income			306,995	267,505
Retirement of treasury stock			(181,106)	(201,017)
Dividends declared			(33,468)	(33,938)
Balance at end of period	2,302,541	2,135,047	2,302,541	2,135,047
Accum. Other Comprehensive Loss
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			(117,004)	(120,057)
Other comprehensive income			(34,794)	(13,550)
Balance at end of period	(151,798)	(133,607)	(151,798)	(133,607)
Treasury Stock
Increase (Decrease) In Shareholders' Equity
Purchase of treasury stock			(181,108)	(201,020)
Retirement of treasury stock			181,108	201,020
Noncontrolling Interests
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			12,223	13,017
Net income			1,486	1,636
Other comprehensive income			148	(60)
Payments to shareholders of noncontrolling interests			(1,736)	(1,650)
Balance at end of period	$ 12,121	$ 12,943	$ 12,121	$ 12,943