Changes in Equity and Noncontrolling Interests (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 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	153,613	127,248
Other comprehensive income	(24,679)	16,426
Payments to shareholders of noncontrolling interests	(1,247)
Purchase of treasury stock	(85,300)	(81,885)
Stock options exercised, including tax benefit	40,970	27,701
Dividends declared	(16,755)	(17,049)
Stock-based compensation expense	8,283	7,491
Balance at end of period	2,517,067	2,264,718
Balance at end of period	(141,760)
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	(1)	(1)
Retirement of treasury stock (in shares)	(1)	(1)
Stock options exercised, including tax benefit	1	1
Stock options exercised, including tax benefit (in shares)	1	1
Balance at end of period (in shares)	160	163
Balance at end of period	160	163
Additional Paid-in Capital
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period	336,683	189,166
Stock options exercised, including tax benefit	40,969	27,700
Stock-based compensation expense	8,283	7,491
Balance at end of period	385,935	224,357
Accumulated Earnings
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period	2,210,120	2,102,497
Net income	153,007	126,563
Retirement of treasury stock	(85,299)	(81,884)
Dividends declared	(16,755)	(17,049)
Balance at end of period	2,261,073	2,130,127
Accum. Other Comprehensive Loss
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period	(117,004)	(120,057)
Other comprehensive income	(24,756)	16,410
Balance at end of period	(141,760)	(103,647)
Treasury Stock
Increase (Decrease) In Shareholders' Equity
Purchase of treasury stock	(85,300)	(81,885)
Retirement of treasury stock	85,300	81,885
Noncontrolling Interests
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period	12,223	13,017
Net income	606	685
Other comprehensive income	77	16
Payments to shareholders of noncontrolling interests	(1,247)
Balance at end of period	$ 11,659	$ 13,718