CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2014		Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 1,193,308,000		$ 750,155,000
Canadian government securities with maturities greater than 90 days at the date of acquisition	461,313,000		374,842,000
Accounts receivable, less allowance for doubtful accounts of $1,609 in both 2014 and 2013	873,277,000		999,872,000
Inventories, at lower of cost or market	242,733,000		294,195,000
Prepaid expenses	77,281,000		83,856,000
Deferred income taxes	55,107,000		61,991,000
Assets held for sale	376,130,000		943,732,000
Total current assets	3,279,149,000		3,508,643,000
Property, plant and equipment, at cost less accumulated depreciation, depletion and amortization of $9,503,524 in 2014 and $8,540,239 in 2013	13,331,047,000		13,481,055,000
Goodwill	0		40,259,000
Deferred charges and other assets	81,151,000		98,123,000
Assets held for sale	50,960,000		381,404,000
Total assets	16,742,307,000		17,509,484,000
Current liabilities
Current maturities of long-term debt	465,388,000		26,249,000
Accounts payable	2,275,830,000		2,158,485,000
Income taxes payable	59,054,000		222,930,000
Other taxes payable	52,457,000		33,969,000
Other accrued liabilities	143,610,000		143,258,000
Liabilities associated with assets held for sale	151,548,000		639,140,000
Total current liabilities	3,147,887,000		3,224,031,000
Long-term debt, including capital lease obligation	2,536,238,000		2,936,563,000
Deferred income taxes	1,193,864,000		1,466,100,000
Asset retirement obligations	841,526,000		852,488,000
Deferred credits and other liabilities	441,048,000		339,028,000
Liabilities associated with assets held for sale	8,310,000		95,544,000
Stockholders' equity
Cumulative Preferred Stock, par $100, authorized 400,000 shares, none issued
Common Stock, par $1.00, authorized 450,000,000 shares, issued 195,040,149 shares in 2014 and 194,920,155 shares in 2013	195,040,000		194,920,000
Capital in excess of par value	906,741,000		902,633,000
Retained earnings	8,728,032,000		8,058,792,000
Accumulated other comprehensive income (loss)	(170,255,000)	[1]	172,119,000	[1]
Treasury stock	(1,086,124,000)		(732,734,000)
Total stockholders' equity	8,573,434,000		8,595,730,000
Total liabilities and stockholders' equity	$ 16,742,307,000		$ 17,509,484,000

[1] All amounts are presented net of income taxes.