XML 40 R52.htm IDEA: XBRL DOCUMENT

Supplemental Financial Statement Information (Schedule Of Depreciation Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Supplemental Financial Statement Information [Abstract]
Depreciation expense	$ 345	$ 323

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.

+ References+ Details