Changes in Equity and Noncontrolling Interests (Details) (USD $) In Thousands, except Share data in Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period	$ 2,880,072	$ 2,442,182
Balance at beginning of period	(54,951)
Net income	159,802	153,613
Other comprehensive income	(14,998)	(24,679)
Payments to shareholders of noncontrolling interests	(1,052)	(1,247)
Purchase of noncontrolling interest	(8)
Purchase of treasury stock	(121,130)	(85,300)
Stock options exercised, including tax benefit	15,316	40,970
Dividends declared	(31,416)	(16,755)
Stock-based compensation expense	9,276	8,283
Balance at end of period	2,895,862	2,517,067
Balance at end of period	(69,541)
Common Stock
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period (in shares)	158	160
Balance at beginning of period	158	160
Retirement of treasury stock	(1,000)	(1,000)
Retirement of treasury stock (in shares)	(1)	(1)
Stock options exercised, including tax benefit		1,000
Stock options exercised, including tax benefit (in shares)		1
Balance at end of period (in shares)	157	160
Balance at end of period	157	160
Additional Paid-In Capital
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period	489,930	336,683
Stock options exercised, including tax benefit	15,316	40,969
Stock-based compensation expense	9,276	8,283
Balance at end of period	514,522	385,935
Retained Earnings
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period	2,424,372	2,210,120
Net income	158,483	153,007
Retirement of treasury stock	(121,129)	(85,299)
Dividends declared	(31,416)	(16,755)
Balance at end of period	2,430,310	2,261,073
Accum. Other Comprehensive Loss
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period	(54,951)	(117,004)
Other comprehensive income	(14,590)	(24,756)
Balance at end of period	(69,541)	(141,760)
Treasury Stock
Increase (Decrease) In Shareholders' Equity
Purchase of treasury stock	(121,130)	(85,300)
Retirement of treasury stock	121,130	85,300
Noncontrolling Interests
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period	20,563	12,223
Net income	1,319	606
Other comprehensive income	(408)	77
Payments to shareholders of noncontrolling interests	(1,052)	(1,247)
Purchase of noncontrolling interest	(8)
Balance at end of period	$ 20,414	$ 11,659