|**Fair Value Measurements and Disclosures of Assets and Liabilities Measured on a Recurring Basis (Details) (USD $)In Millions, unless otherwise specified**                                                                                                                                                                               | Dec. 31, 2013                                                                                                                                                           | Dec. 31, 2012                                                                                                                  
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|**Financial Assets [Abstract]**                                                                                                                                                                                                                                                                                                            |                                                                                                                                                                         |                                                                                                                                
|Mutual Fund Investments                                                                                                                                                                                                                                                                                                                    | $ 114                                                                                                                                                                   |                                                                                                                                
|Commodity Derivative Investments                                                                                                                                                                                                                                                                                                           | 17                                                                                                                                                                      |                                                                                                                                
|**Financial Liabilities [Abstract]**                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                         |                                                                                                                                
|Commodity Derivative Instruments                                                                                                                                                                                                                                                                                                           | (75)                                                                                                                                                                    |                                                                                                                                
|Portion of Deferred Compensation Liability Measured at Fair Value                                                                                                                                                                                                                                                                          | (176)                                                                                                                                                                   |                                                                                                                                
|Quoted Prices in Active Markets (Level 1)                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                         |                                                                                                                                
|**Financial Assets [Abstract]**                                                                                                                                                                                                                                                                                                            |                                                                                                                                                                         |                                                                                                                                
|Mutual Fund Investments                                                                                                                                                                                                                                                                                                                    | 114                                                                                                                                                                     |                                                                                                                                
|Commodity Derivative Investments                                                                                                                                                                                                                                                                                                           | 0                                                                                                                                                                       | [1]                                                                                                                            
|**Financial Liabilities [Abstract]**                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                         |                                                                                                                                
|Commodity Derivative Instruments                                                                                                                                                                                                                                                                                                           | 0                                                                                                                                                                       | [1]                                                                                                                            
|Portion of Deferred Compensation Liability Measured at Fair Value                                                                                                                                                                                                                                                                          | (176)                                                                                                                                                                   | [1]                                                                                                                            
|Significant Other Observable Inputs (Level 2)                                                                                                                                                                                                                                                                                              |                                                                                                                                                                         |                                                                                                                                
|**Financial Assets [Abstract]**                                                                                                                                                                                                                                                                                                            |                                                                                                                                                                         |                                                                                                                                
|Mutual Fund Investments                                                                                                                                                                                                                                                                                                                    | 0                                                                                                                                                                       | [1]                                                                                                                            
|Commodity Derivative Investments                                                                                                                                                                                                                                                                                                           | 28                                                                                                                                                                      | [1]                                                                                                                            
|**Financial Liabilities [Abstract]**                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                         |                                                                                                                                
|Commodity Derivative Instruments                                                                                                                                                                                                                                                                                                           | (86)                                                                                                                                                                    | [1]                                                                                                                            
|Portion of Deferred Compensation Liability Measured at Fair Value                                                                                                                                                                                                                                                                          | 0                                                                                                                                                                       | [1]                                                                                                                            
|Significant Unobservable Inputs (Level 3)                                                                                                                                                                                                                                                                                                  |                                                                                                                                                                         |                                                                                                                                
|**Financial Assets [Abstract]**                                                                                                                                                                                                                                                                                                            |                                                                                                                                                                         |                                                                                                                                
|Mutual Fund Investments                                                                                                                                                                                                                                                                                                                    | 0                                                                                                                                                                       | [1]                                                                                                                            
|Commodity Derivative Investments                                                                                                                                                                                                                                                                                                           | 0                                                                                                                                                                       | [1]                                                                                                                            
|**Financial Liabilities [Abstract]**                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                         |                                                                                                                                
|Commodity Derivative Instruments                                                                                                                                                                                                                                                                                                           | 0                                                                                                                                                                       | [1]                                                                                                                            
|Portion of Deferred Compensation Liability Measured at Fair Value                                                                                                                                                                                                                                                                          | 0                                                                                                                                                                       | [1]                                                                                                                            
|Adjustment                                                                                                                                                                                                                                                                                                                                 |                                                                                                                                                                         |                                                                                                                                
|**Financial Assets [Abstract]**                                                                                                                                                                                                                                                                                                            |                                                                                                                                                                         |                                                                                                                                
|Mutual Fund Investments                                                                                                                                                                                                                                                                                                                    | 0                                                                                                                                                                       | [2]                                                                                                                            
|Commodity Derivative Investments                                                                                                                                                                                                                                                                                                           | (11)                                                                                                                                                                    | [2]                                                                                                                            
|**Financial Liabilities [Abstract]**                                                                                                                                                                                                                                                                                                       |                                                                                                                                                                         |                                                                                                                                
|Commodity Derivative Instruments                                                                                                                                                                                                                                                                                                           | 11                                                                                                                                                                      | [2]                                                                                                                            
|Portion of Deferred Compensation Liability Measured at Fair Value                                                                                                                                                                                                                                                                          | $ 0                                                                                                                                                                     | [2]                                                                                                                            
|                                                                                                                                                                                                                                                                                                                                          
|[1]
              See Note 1. Summary of Significant Accounting Policies - Fair Value Measurements for a description of the fair value hierarchy.[2]
              Amount represents the impact of netting clauses within our master agreements that allow us to net cash settle asset and liability positions with the same counterparty. | [1]                                                                                                                                                                     | See Note 1. Summary of Significant Accounting Policies - Fair Value Measurements for a description of the fair value hierarchy.
|[1]                                                                                                                                                                                                                                                                                                                                        | See Note 1. Summary of Significant Accounting Policies - Fair Value Measurements for a description of the fair value hierarchy.                                        
|[2]                                                                                                                                                                                                                                                                                                                                        | Amount represents the impact of netting clauses within our master agreements that allow us to net cash settle asset and liability positions with the same counterparty.

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