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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Preferred stock, par value (usd per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (shares) 20,000,000 20,000,000
Preferred stock, shares outstanding (shares) 7,252,000 7,252,000
Common stock, par value (usd per share) $ 0.01 $ 0.01
Common Stock, Shares Authorized 1,000,000,000 1,000,000,000
Common Stock, Shares, Issued 668,919,000 666,468,000
Treasury stock, shares 2,288,449 2,147,724
Exact Value [Member]
   
Preferred stock, shares outstanding (shares) 7,251,515 7,251,515
Common Stock, Shares, Issued 668,918,705 666,467,664
Variable Interest Entities
   
Cash and cash equivalents attributable to our VIEs $ 1 $ 1
Evaluated natural gas and oil properties attributable to our VIEs 488 488
Less:accumulated depreciation, depletion and amortization attributable to our VIEs (136) (58)
Long-term derivative assets attributable to our VIEs 1 0
Short-term derivative liabilities attributable to our VIEs 4 4
Other current liabilities attributable to our VIEs 21 21
Long-term derivative liabilities attributable to our VIEs $ 0 $ 3