Derivatives And Other Financial Instruments (Schedule Of Reconciliation Of Activity For Derivative Contracts On A Net Basis) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at end of year	$ 618		$ 779
Financial Instruments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of year	779		831
Sales-(decrease)	(63)		(38)
Cost of goods sold-(increase)	(15)		(20)
Other (income) expenses, net-(increase) decrease	(43)		25
Other comprehensive (loss) income-(increase)	(35)		(19)
Purchases, sales, issuances, and settlements	(5)	[1]
Balance at end of year	618		779
Sales
Cost of goods sold
Other (income) expenses, net-(increase) decrease	(5)		22
Pension And Other Postretirement Benefit Plans' Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of year	1,499		920
Other comprehensive (loss) income-(increase)	100		130
Transfers into and (or) out of Level 3		[2]		[2]
Balance at end of year	$ 2,760		$ 1,499

[1] In 2011, there was an issuance of a Level 3 financial instrument related to a natural gas supply contract (see below). There were no purchases, sales, or settlements of Level 3 financial instruments in 2011 and 2010.

[2] In 2011 and 2010, there were no transfers of financial instruments into or out of Level 3