Additional Shareholders' Equity Information (Tables)

12 Months Ended

Dec. 31, 2012

Additional Shareholders' Equity Information [Abstract]

Schedule Of Activity In Shares Of Common And Treasury Stock

Activity in shares of our common stock and treasury stock was as follows:

	Year Ended December 31,
	2012		2011
Common Stock Shares Issued
Shares, Beginning of Period	196,656,846		195,440,048
Exercise of Common Stock Options	1,265,231		837,096
Restricted Stock Awards, Net of Forfeitures	426,665		379,702
Shares, End of Period	198,348,742		196,656,846
Treasury Stock
Shares, Beginning of Period	18,736,520		18,650,064
Shares Received From Employees in Payment of Withholding Taxes Due on Vesting of Shares of Restricted Stock	141,124		186,556
Rabbi Trust Shares Distributed and/or Sold	(102,268	)	(100,100	)
Shares, End of Period	18,775,376		18,736,520

Accumulated other comprehensive income (loss) in the shareholders' equity section of the balance sheet

Accumulated other comprehensive loss in the shareholders’ equity section of the balance sheet included:

	Accumulated Other Comprehensive Loss
	Oil and Gas  Cash Flow  Hedges			Interest Rate  Cash Flow Hedges			Pension- Related and  Other			Total
(millions)
December 31, 2009	$	(12	)	$	(2	)	$	(61	)	$	(75	)
Realized Amounts Reclassified Into Earnings	12			1			3			16
Net Change in Other	—			(41		)	(4		)	(45		)
December 31, 2010	—			(42		)	(62		)	(104		)
Realized Amounts Reclassified Into Earnings	—			1			4			5
Unrealized Change in Fair Value	—			15			(16		)	(1		)
December 31, 2011	—			(26		)	(74		)	(100		)
Realized Amounts Reclassified Into Earnings	—			1			6			7
Unrealized Change in Fair Value	—			—			(20		)	(20		)
December 31, 2012	$	—		$	(25	)	$	(88	)	$	(113	)