Discontinued Operations (Major Categories of Assets and Liabilities Reflected as Held for Sale) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable	$ 970,286,000	$ 999,872,000
Held for sale assets of U.K. oil and gas operations	735,875,000	943,732,000
Property, plant and equipment, net	14,372,837,000	13,481,055,000
Other	87,106,000	98,123,000
Total non-current assets held for sale	60,507,000	381,404,000
Total current liabilities associated with assets held for sale	185,846,000	639,140,000
Deferred income taxes payable	1,519,677,000	1,466,100,000
Other	344,301,000	339,028,000
Total non-current liabilities associated with assets held for sale	75,037,000	95,544,000
UK Refining And Marketing Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash	197,607,000,000	301,302,000,000
Accounts receivable	378,804,000,000	302,059,000,000
Inventories	85,757,000,000	254,240,000,000
Other	73,707,000,000	86,131,000,000
Held for sale assets of U.K. oil and gas operations	735,875,000,000	943,732,000,000
Property, plant and equipment, net	37,304,000,000	360,347,000,000
Other	23,203,000,000	21,057,000,000
Total non-current assets held for sale	60,507,000,000	381,404,000,000
Accounts payable	185,846,000,000	637,432,000,000
Other		1,708,000,000
Total current liabilities associated with assets held for sale	185,846,000,000	639,140,000,000
Deferred income taxes payable	70,424,000,000	68,096,000,000
Other	4,613,000,000	27,448,000,000
Total non-current liabilities associated with assets held for sale	$ 75,037,000,000	$ 95,544,000,000