Segment And Geographic Area Information (Schedule Of Segment Reporting Information To Consolidated Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Segment Reporting Information [Line Items]
Total segment assets	$ 32,039	$ 31,870
Elimination of intersegment receivables	(483)	(471)
Cash and cash equivalents	1,939	1,543	1,481	762
Corporate goodwill	5,251	5,122	5,054
Corporate fixed assets, net	19,416	20,183
Total Assets	40,120	39,293
Unallocated Amounts (Net Of Tax) [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents	1,939	1,543
Deferred income taxes	3,738	3,400
Corporate goodwill	1,375	1,387
Corporate fixed assets, net	943	930
LIFO reserve	(801)	(742)
Other	$ 1,370	$ 1,376