CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
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)	7,251,515	7,251,515
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	665,214,625	666,192,371
Treasury stock, shares	1,986,178	2,002,029
Variable Interest Entities
Cash and cash equivalents ($1 and $1 attributable to our VIE)	$ 1	$ 1
Proved natural gas and oil properties ($488 and $488 attributable to our VIE)	488	488
Less: accumulated depreciation, depletion and amortization (($190) and ($168) attributable to our VIE)	(190)	(168)
Short-term derivative liabilities ($6 and $5 attributable to our VIE)	6	5
Other current liabilities ($19 and $22 attributable to our VIE)	$ 19	$ 22