Investments (Tables)

12 Months Ended

Dec. 31, 2013

Investment Holdings, Schedule of Investments [Table Text Block]

A summary of our investments, including our approximate ownership percentage as of December 31, 2013 and 2012, is presented below.



		Approximate Ownership %		Carrying Value
	Accounting	December 31,		December 31,
	Method	2013	2012	2013		2012
				($ in millions)
FTS International, Inc.	Equity	30%	30%	$	138	$	298
Chaparral Energy, Inc.	Equity	20%	20%	143		141
Sundrop Fuels, Inc.	Equity	56%	50%	135		111
Clean Energy Fuels Corp. (common stock)	Fair Value	—%	1%	—		12
Clean Energy Fuels Corp. (convertible notes)	Cost	—%	—%	—		100
Gastar Exploration Ltd.	Fair Value	—%	10%	—		8
Other	—	—%	—%	61		58
Total investments				$	477	$	728

Equity Method Investments [Table Text Block]

The table below presents summarized financial information for our significant equity method investments, including FTS and Sundrop. The investee financial information reflects the most current financial information available to investors and includes lags in financial reporting of up to one quarter.



	Years Ended December 31,
	2013			2012			2011
	($ in millions)
Current assets	$	521		$	892		$	732
Noncurrent assets	$	1,859		$	4,225		$	5,175
Current liabilities	$	192		$	207		$	277
Noncurrent liabilities	$	1,468		$	1,726		$	1,916
Gross revenue	$	1,807		$	2,190		$	2,209
Operating expense	$	3,926		$	3,089		$	1,630
Net income (loss)	$	(2,459	)	$	(968	)	$	494