Acquisitions (Details) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended		0 Months Ended	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Oct. 02, 2011 Meraux Acquisition [Member]	Dec. 31, 2011 Meraux Acquisition [Member]	Aug. 01, 2011 Pembroke Acquisition [Member]	Sep. 30, 2012 Pembroke Acquisition [Member]	Dec. 31, 2011 Pembroke Acquisition [Member]
Purchase Price Allocation
Current assets, net of cash acquired								$ 2,215,000,000
Property, plant and equipment								947,000,000
Intangible assets								22,000,000
Deferred charges and other assets, net								37,000,000
Current liabilities, less current portion of debt and capital lease obligations								(1,294,000,000)
Debt and capital leases assumed, including current portion								(12,000,000)
Deferred income taxes								(159,000,000)
Other long-term liabilities								(60,000,000)
Noncontrolling interest								(5,000,000)
Purchase price, net of cash acquired								1,691,000,000
Acquisitions (Textual)
Effective date of acquisition					Oct. 01, 2011		Aug. 01, 2011
Purchase price of acquired entity					586,000,000	547,000,000	1,800,000,000		1,700,000,000
Percentage of outstanding shares acquired							100.00%
Purchase price of working capital							1,100,000,000
Purchase price allocation adjustment increase to property, plant, and equipment								143,000,000
Purchase price allocation adjustment increase to deferred tax liabilities								124,000,000
Purchase price alloation adjustment increase to other long-term liabilities								17,000,000
Depreciation expense true-up	$ 402,000,000	$ 390,000,000	$ 1,172,000,000	$ 1,141,000,000				$ 6,000,000