The calculated weighted-average amortization period of a major class of finite-lived intangible assets acquired during the current period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph a(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275

Acquisitions (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended			0 Months Ended		2 Months Ended	3 Months Ended	9 Months Ended		1 Months Ended			1 Months Ended			1 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2011 Purchase Price Allocation Adjustments [Member] Acquisition [Member] Meraux Acquisition [Member]	Oct. 02, 2011 Acquisition [Member] Meraux Acquisition [Member]	Aug. 01, 2011 Pembroke Acquisition [Member]	Sep. 30, 2011 Pembroke Acquisition [Member]	Sep. 30, 2011 Pembroke Acquisition [Member]	Sep. 30, 2011 Pembroke Acquisition [Member]	Mar. 31, 2010 ASA And Renew Acquisitions [Member]	Jan. 31, 2010 ASA Acquisition [Member]	Dec. 31, 2009 ASA Acquisition [Member]	Jan. 13, 2010 ASA Acquisition [Member]	Feb. 28, 2010 Renew Acquisition [Member]	Dec. 31, 2009 Renew Acquisition [Member]	Feb. 04, 2010 Renew Acquisition [Member]	Jun. 30, 2011 Terminals [Member]
Fair value of acquisition
Current assets, net of cash acquired								$ 2,217	$ 2,217	$ 2,217
Property, plant and equipment								777	777	777
Deferred charges and other assets								17	17	17
Intangible assets								50	50	50
Current liabilities, less current portion of debt and capital lease obligations								(1,294)	(1,294)	(1,294)
Debt and capital leases assumed, including current portion								(12)	(12)	(12)
Other long-term liabilities								(77)	(77)	(77)
Noncontrolling interest								(3)	(3)	(3)
Purchase price, net of cash acquired								1,675	1,675	1,675
Actual amounts from acquisition
Operating revenues								3,028
Income from continuing operations								19
Consolidated pro forma financial information
Operating revenues	35,491	24,594	103,030	70,638
Income from continuing operations	1,196	306	1,941	767
Earnings per common share from continuing operations - basic	$ 2.11	$ 0.54	$ 3.41	$ 1.36
Earnings per common share from continuing operations - assuming dilution	$ 2.10	$ 0.54	$ 3.39	$ 1.35
Acquisitions (Textual)
Effective date of acquisition						October 1, 2011	August 1, 2011
Purchase price of acquired entity						586	1,800
Purchase price of working capital					(40)	261	1,100
Percentage of outstanding shares acquired							100.00%
Throughput capacity of petroleum refining (barrels per day)						135,000	270,000
Acquired finite-lived intangible assets, weighted-average useful life								15
Acquisition related costs									18	23
Number of plants, pipelines, or facilities purchased											3			2			1	2
Payments to acquire pipeline and terminal facilties			37	0														37
Payments to acquire businesses, gross			$ 0	$ 260								$ 202	$ 20		$ 79	$ 1