Segment Information (Schedule Of Revenues By Product Line) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total revenues	$ 100,160	$ 82,243	$ 78,638
Less: Sales to related parties	8	8	55
Sales and other operating revenues (including consumer excise taxes)	100,152	82,235	78,583
Refined Products [Member]
Segment Reporting Information [Line Items]
Total revenues	93,520	76,234	73,334
Merchandise [Member]
Segment Reporting Information [Line Items]
Total revenues	3,308	3,229	3,090
Crude Oil And Refinery Feedstocks [Member]
Segment Reporting Information [Line Items]
Total revenues	2,988	2,514	1,972
Transportation And Other [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 344	$ 266	$ 242