Capital Stock (Stock Repurchases Pursuant To Board Of Director Authorizations) (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Capital Stock [Abstract]
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	14.5
Class of Stock [Line Items]
Shares repurchased	6.5	6.2	0.1
1997 Authorization [Member]
Capital Stock [Abstract]
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	0
Class of Stock [Line Items]
Shares repurchased	4.3	6.2	0.1
2007 Authorization [Member]
Capital Stock [Abstract]
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	14.5
Class of Stock [Line Items]
Shares repurchased	2.2	0	0