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Investments (Tables)
6 Months Ended
Jun. 30, 2013
Text Block [Abstract]  
Schedule Of Investments
A summary of our investments is presented below, including our approximate ownership percentage as of June 30, 2013.
 
 
 
 
 
 
Carrying Value
 
 
Approximate
Ownership %
 
Accounting
Method
 
June 30,
2013
 
December 31,
2012
 
 
 
 
 
 
($ in millions)
FTS International, Inc.
 
30%
 
Equity
 
$
329

 
$
298

Chaparral Energy, Inc.
 
20%
 
Equity
 
139

 
141

Sundrop Fuels, Inc.
 
50%
 
Equity
 
101

 
111

Twin Eagle Resource Management, LLC
 
30%
 
Equity
 
30

 
34

Maalt Specialized Bulk, LLC
 
49%
 
Equity
 
13

 
13

Clean Energy Fuels Corp.
(common stock)
 
1%
 
Fair Value
 
13

 
12

Clean Energy Fuels Corp.
(convertible notes)
 
 
Cost
 

 
100

Gastar Exploration Ltd.
 
 
Fair Value
 

 
8

Other
 
 
 
11

 
11

Total investments
 
$
636

 
$
728