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Financial Instruments (Schedule Of Cash Flow Hedges Effect On Accumulated Other Comprehensive Income, Net Of Taxes) (Details) (Cash Flow Hedges [Member], USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Cash Flow Hedges [Member]
Accumulated gain at beginning of period	$ 66	$ 68	$ 79	$ 101
Transfer of realized gains in fair value to earnings	(3)	(3)	(17)	(6)
Unrealized loss in fair value	(119)	(131)	(118)	(161)
Accumulated loss at June 30	$ (56)	$ (66)	$ (56)	$ (66)

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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