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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2012
Text Block [Abstract]  
Summary of Assets and Liabilities Held for Sale
A summary of the assets and liabilities held for sale on our condensed consolidated balance sheet as of September 30, 2012 is detailed below. 
 
September 30, 2012
 
($ in millions)
Cash
$
14

Accounts receivable
90

Other assets
7

Current assets held for sale
$
111

Natural gas gathering systems and treating plants, net of accumulated depreciation
$
2,027

Oilfield services equipment, net of accumulated depreciation
24

Other property and equipment, net of accumulated depreciation and amortization
256

Property and equipment held for sale, net
$
2,307

Investments
$
123

Long-term assets held for sale
$
123

Accounts payable
$
33

Accrued liabilities
143

Current liabilities held for sale
$
176

Asset retirement obligations
$
2

Long-term liabilities held for sale
$
2