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Supplemental Financial Statement Information (Schedule Of Depreciation Expense) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Supplemental Financial Statement Information
Depreciation expense	$ 320	$ 348	$ 642	$ 703

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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