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, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 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	176,417	154,868	336,219	308,481
Other comprehensive income			2,484	(34,646)
Payments to shareholders of noncontrolling interest			(1,729)	(1,736)
Purchase of noncontrolling interest			(8)
Purchase of treasury stock			(250,159)	(181,108)
Stock options exercised, including tax benefit			75,249	80,380
Dividends declared	(31,370)	(16,713)	(62,788)	(33,468)
Stock-based compensation expense			19,249	17,175
Balance at end of period	2,998,589	2,597,260	2,998,589	2,597,260
Balance at end of period	(52,105)		(52,105)
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			(3)	(2)
Retirement of treasury stock (in shares)			(3)	(2)
Stock options exercised, including tax benefit			2	2
Stock options exercised, including tax benefit (in shares)			2	2
Balance at end of period (in shares)	157	160	157	160
Balance at end of period	157	160	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			75,247	80,378
Stock-based compensation expense			19,249	17,175
Balance at end of period	584,426	434,236	584,426	434,236
Retained Earnings
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			2,424,372	2,210,120
Net income			333,415	306,995
Retirement of treasury stock			(250,156)	(181,106)
Dividends declared			(62,788)	(33,468)
Balance at end of period	2,444,843	2,302,541	2,444,843	2,302,541
Accumulated Other Comprehensive Loss
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			(54,951)	(117,004)
Other comprehensive income			2,846	(34,794)
Balance at end of period	(52,105)	(151,798)	(52,105)	(151,798)
Treasury Stock
Increase (Decrease) In Shareholders' Equity
Purchase of treasury stock			(250,159)	(181,108)
Retirement of treasury stock			250,159	181,108
Noncontrolling Interests
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			20,563	12,223
Net income			2,804	1,486
Other comprehensive income			(362)	148
Payments to shareholders of noncontrolling interest			(1,729)	(1,736)
Purchase of noncontrolling interest			(8)
Balance at end of period	$ 21,268	$ 12,121	$ 21,268	$ 12,121