Discontinued Operations (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended	0 Months Ended		0 Months Ended		3 Months Ended	12 Months Ended		0 Months Ended		12 Months Ended	3 Months Ended				12 Months Ended	3 Months Ended					10 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011	Jul. 26, 2011 Sunoco, Inc. [Member]	Mar. 31, 2012 Sunoco, Inc. [Member]	Jan. 05, 2012 SunCoke Energy, Inc. [Member]	Jul. 26, 2011 SunCoke Energy, Inc. [Member]	Mar. 31, 2012 SunCoke Energy, Inc. [Member]	Dec. 31, 2011 SunCoke Energy, Inc. [Member]	Dec. 31, 2011 IPO [Member] SunCoke Energy, Inc. [Member]	Jul. 26, 2011 Cokemaking Operations [Member] IPO [Member] SunCoke Energy, Inc. [Member]	Jul. 12, 2011 Cokemaking Operations [Member] IPO [Member] SunCoke Energy, Inc. [Member]	Dec. 31, 2011 Non-Controlling Interests [Member] IPO [Member] SunCoke Energy, Inc. [Member]	Mar. 31, 2012 Capital In Excess Of Par Value [Member] SunCoke Energy, Inc. [Member]	Mar. 31, 2012 Retained Earnings [Member] SunCoke Energy, Inc. [Member]	Jun. 30, 2010 Polypropylene Chemicals Operations [Member]	Mar. 31, 2010 Polypropylene Chemicals Operations [Member]	Dec. 31, 2011 Polypropylene Chemicals Operations [Member]	Sep. 30, 2011 Frankford Facility [Member]	Jun. 30, 2011 Frankford Facility [Member]	Mar. 31, 2012 Haverhill Facility [Member]	Dec. 31, 2011 Haverhill Facility [Member]	Jun. 30, 2011 Haverhill Facility [Member]	Jan. 31, 2013 Scenario, Forecast [Member] SunCoke Energy, Inc. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Borrowings from affiliate of IPO underwriter												$ 300
Initial public offering of shares											13.34
Offering price, per share											$ 16
Reduction to equity														143	267
Increase in accumulated other comprehensive loss								(5)
Underwriters commission and other expenses for spinoff					16			16
Stock compensation modification cash payment								7
Plan participants affected by stock compensation modification								60
Stock compensation modification additional expense								10																6
Value of shares exchanged for settlement of borrowings											213
Cash payment for settlement of borrowings							87
Underwriters' commissions and other expenses incurred in connection with initial public offering				21
Controlling ownership by parent	2.00%								81.00%
Noncontrolling interest, period increase (decrease)													112
Adjustments to additional paid in capital, other										80
Shareholders spin-off transaction stock dividend ratio						$ 0.53
Sales and other operating revenue	87		631
Gain (loss) on divestment of discontinued operations, pretax																	169		7		3	6
Gain (loss) on divestment of discontinued operations, after tax																	44		4		2	4
Cash received on divestment of business																348			88			93
Additional tax provision related to the sale		5																4
Provision to write down certain assets, before tax																				118			169
Provision to write down certain assets, after tax	$ 63	$ 4																		$ 70			$ 101