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Subsequent Events Subsequent Events - Narrative (Details)
Boe in Thousands, $ in Millions
 3 Months Ended 9 Months Ended 216 Months Ended
Oct. 31, 2016
USD ($)
a
Boe
well
Oct. 14, 2016
USD ($)
Oct. 05, 2016
USD ($)
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2034
Dec. 31, 2015
USD ($)
Subsequent Event [Line Items]                
Debt Instrument, Face Amount       $ 8,717 $ 8,717     $ 9,706
Cash paid to purchase debt       1,500 1,979 $ 0    
Proceeds from divestitures of proved and unproved properties       $ 26 988 $ 188    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred         $ 106      
Subsequent Event [Member]                
Subsequent Event [Line Items]                
Debt Instrument, Face Amount   $ 105            
Cash paid to purchase debt   $ 106            
Service Contract Term             20 years  
Subsequent Event [Member] | Barnett Shale [Member]                
Subsequent Event [Line Items]                
Proceeds from divestitures of proved and unproved properties $ 218              
Number Of Net Acres | a 212,000              
Operated Wells | well 2,800              
Thousands of Barrels of Oil Equivalent per Day | Boe 59              
Loss on contract termination $ 334              
Subsequent Event [Member] | Barnett Shale [Member] | Scenario, Forecast [Member]                
Subsequent Event [Line Items]                
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred $ 70              
Subsequent Event [Member] | Common Stock [Member]                
Subsequent Event [Line Items]                
Conversion of Stock, Shares Converted | shares     110,300,000          
Subsequent Event [Member] | 5.5% unsecured Convertible Senior Notes due 2026 [Member]                
Subsequent Event [Line Items]                
Debt Instrument, Face Amount     $ 1,250          
Debt Instrument, Interest Rate, Stated Percentage     5.50%          
Subsequent Event [Member] | 5.0% Cumulative Convertible Preferred Stock Series 2005 B [Member]                
Subsequent Event [Line Items]                
Stock Issued During Period, Shares, Conversion of Convertible Securities | shares     134,000          
Preferred Stock, Dividend Rate, Percentage     5.00%          
Subsequent Event [Member] | 5.75% Cumulative Convertible Preferred Stock [Member]                
Subsequent Event [Line Items]                
Stock Issued During Period, Shares, Conversion of Convertible Securities | shares     606,271          
Preferred Stock, Dividend Rate, Percentage     5.75%          
Subsequent Event [Member] | 5.75% Cumulative Convertible Preferred Stock Series A [Member]                
Subsequent Event [Line Items]                
Stock Issued During Period, Shares, Conversion of Convertible Securities | shares     553,007          
Preferred Stock, Dividend Rate, Percentage     5.75%