Property, Plant and Equipment - Additional information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Oct. 04, 2014
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ 6,630,000,000	$ 7,070,000,000
Property, plant and equipment net of accumulated depreciation, under a capital lease agreement	0	23,500,000
Gross property, plant and equipment acquired under capital lease		25,400,000
Total obligations associated with capital lease agreement	0	23,700,000
Capital lease obligations classified in accrued expenses and other current liabilities		2,200,000
Capital lease obligations classified in deferred credits and other liabilities		21,500,000
Property plant and equipment written down	21,000,000
Inventory written down	7,000,000
Insurance receivable	14,000,000
Associated net charges included in marketing, administrative and other expenses	14,000,000
Property, plant and equipment, net	4,917,024,000	4,884,010,000
Two remaining storage domes [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net		$ 21,000,000