Investments (Tables)

12 Months Ended

Dec. 31, 2012

Text Block [Abstract]

Schedule Of Investments

At December 31, 2012 and 2011, we had the following investments:

			Carrying Value
	Approximate Ownership %	Accounting Method	December 31,
			2012		2011
			($ in millions)
FTS International, Inc.	30%	Equity	$	298	$	235
Chaparral Energy, Inc.	20%	Equity	141		143
Sundrop Fuels, Inc.	50%	Equity	111		34
Clean Energy Fuels Corp.	—	Cost	100		50
Twin Eagle Resource Management, LLC	30%	Equity	34		20
Maalt Specialized Bulk, LLC	49%	Equity	13		12
Clean Energy Fuels Corp.	1%	Fair Value	12		12
Gastar Exploration Ltd.	10%	Fair Value	8		22
Chesapeake Midstream Partners, L.P.(a)	—	Equity	—		987
Other	—	—	11		16
Total investments			$	728	$	1,531

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(a) See Sold Investments below.