Property, Plant And Equipment (Summary Of Property, Plant And Equipment) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Total	$ 19,051	$ 18,073
Less accumulated depreciation	6,519	5,845
Net property, plant and equipment	12,532	12,228
Refining & Marketing [Member]
Property, Plant and Equipment [Line Items]
Total	14,884	14,221
Speedway [Member]
Property, Plant and Equipment [Line Items]
Total	2,024	1,887
Pipeline Transportation [Member]
Property, Plant and Equipment [Line Items]
Total	1,726	1,593
Corporate And Other [Member]
Property, Plant and Equipment [Line Items]
Total	$ 417	$ 372

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

+ References+ Details

Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References+ Details

- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References+ Details