Employee Benefit Plans (Summary Of Amount Included In Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Qualified Pension Plans [Member]
Prefunded pension cost			$ 101
Accrued pension liability	(139)		(165)
Net amount recognized	(139)		(64)
Non-Qualified Pension Plans [Member]
Accrued pension liability	(160)	[1]	(167)	[1]
Amount recognized in Current Liabilities	17		19
Other Post-Retirement Benefit Plans [Member]
Accrued pension liability	(486)	[2]	(537)	[2]
Amounts recognized in other within current liabilities	$ 3		$ 2

[1] Includes $17 million and $19 million recognized in Other within Current Liabilities on the Consolidated Balance Sheets as of December 31, 2011 and 2010, respectively.

[2] Includes $3 million and $2 million recognized in Other within Current Liabilities on the Consolidated Balance Sheets as of December 31, 2011 and 2010, respectively.