Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]	0000277135 (http://www.sec.gov/CIK)
Scenario [Axis]	Scenario, Unspecified [Domain]
Partner Type [Axis]	Partner Type of Partners' Capital Account, Name [Domain]
Partner Capital Components [Axis]	Partner Capital Components [Domain]

Statement [Line Items]	Period [Axis]
	2013-01-01 - 2013-12-31					2012-01-01 - 2012-12-31					2011-01-01 - 2011-12-31
	Equity Components [Axis]					Equity Components [Axis]					Equity Components [Axis]
	Equity Option [Member]		Equity Component [Domain]			Equity Option [Member]		Equity Component [Domain]			Equity Component [Domain]
	Capital Stock [Axis]		Capital Stock [Axis]			Capital Stock [Axis]		Capital Stock [Axis]			Capital Stock [Axis]
	Common Stock [Member]	Treasury Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	Capital Stock [Domain]	Common Stock [Member]	Treasury Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	Capital Stock [Domain]	Common Stock [Member]	Treasury Stock [Member]	Capital Stock [Domain]
Common Stock, Shares, Outstanding			68,853,938					69,478,495			69,962,852
Treasury Stock, Shares				40,805,281	40,805,281				40,180,724	40,180,724		39,696,367
Exercised (in shares)	800,101	(800,101)			(805,235)	966,705	(966,705)			(972,015)			(1,323,883)
Settlement of restricted stock units, net of 135,341 and 121,353 shares retained, respectively			232,483	(232,483)				225,997	(225,997)
Settlement of performance share units, net of 39,874 and 23,590 shares retained, respectively			61,860	(61,860)				44,051	(44,051)
Purchase of treasury shares			(1,719,001)	1,719,001				(1,721,110)	1,721,110