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, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			$ 2,184,786	$ 2,342,715
Balance at beginning of period			(120,057)
Net income	148,800	136,058	417,941	413,837
Translation adjustments			6,932	(7,083)
Revaluation of forward contract derivatives			235
Defined benefit plan liability adjustment, net of tax				222
Payments to shareholders of noncontrolling interests			(4,713)	(3,835)
Purchase of noncontrolling interests				(24,854)
Purchase of treasury stock			(229,442)	(534,000)
Stock options exercised, including tax benefit			90,217	29,186
Dividends declared	(16,964)	(2,494)	(50,905)	(7,650)
Stock-based compensation expense			23,167	21,011
Balance at end of period	2,438,218	2,229,549	2,438,218	2,229,549
Balance at end of period	(112,977)		(112,977)
Common Stock
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period (in shares)			163	176
Balance at beginning of period			163	176
Retirement of treasury stock			(4)	(11)
Retirement of treasury stock (in shares)			(4)	(11)
Stock options exercised, including tax benefit			3
Stock options exercised, including tax benefit (in shares)			3
Balance at end of period (in shares)	162	165	162	165
Balance at end of period	162	165	162	165
Additional Paid-in Capital
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			189,166	144,855
Purchase of noncontrolling interests				(15,962)
Stock options exercised, including tax benefit			90,214	29,186
Stock-based compensation expense			23,167	21,011
Balance at end of period	302,547	179,090	302,547	179,090
Accumulated Earnings
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			2,102,497	2,260,581
Net income			414,955	410,332
Retirement of treasury stock			(229,438)	(533,989)
Dividends declared			(50,905)	(7,650)
Balance at end of period	2,237,109	2,129,274	2,237,109	2,129,274
Accum. Other Comprehensive Loss
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			(120,057)	(84,757)
Translation adjustments			6,845	(7,420)
Revaluation of forward contract derivatives			235
Defined benefit plan liability adjustment, net of tax				222
Balance at end of period	(112,977)	(91,955)	(112,977)	(91,955)
Treasury Stock
Increase (Decrease) In Shareholders' Equity
Purchase of treasury stock			(229,442)	(534,000)
Retirement of treasury stock			229,442	534,000
Noncontrolling Interests
Increase (Decrease) In Shareholders' Equity
Balance at beginning of period			13,017	21,860
Net income			2,986	3,505
Translation adjustments			87	337
Payments to shareholders of noncontrolling interests			(4,713)	(3,835)
Purchase of noncontrolling interests				(8,892)
Balance at end of period	$ 11,377	$ 12,975	$ 11,377	$ 12,975