|**Divestitures (Tables)**                                | 3 Months Ended                                                                                                                                                                                                                                                                                                                           
|-------------------------------------------------------- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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|**Divestitures [Abstract]**                              |                                                                                                                                                                                                                                                                                                                                          
|Schedule of gin on asset divestitures                    | Information regarding assets sold during the first three months of 2014 is as follows:Three Months Ended March 31,(millions)2014Sales Proceeds$92LessNet Book Value of Assets Sold(106)Goodwill Allocated to Assets Sold(6)Asset Retirement Obligations Associated with Assets Sold20Other Closing Adjustments(1)Gain on Divestitures$(1)
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|                                                         |                                                                                                                                                                                                                                                                                                                                          
|                                                         | Three Months Ended March 31,                                                                                                                                                                                                                                                                                                             
|(millions)                                               | 2014                                                                                                                                                                                                                                                                                                                                     
|Sales Proceeds                                           | $                                                                                                                                                                                                                                                                                                                                        
|Less                                                     |                                                                                                                                                                                                                                                                                                                                          
|Net Book Value of Assets Sold                            | (106                                                                                                                                                                                                                                                                                                                                     
|Goodwill Allocated to Assets Sold                        | (6                                                                                                                                                                                                                                                                                                                                       
|Asset Retirement Obligations Associated with Assets Sold | 20                                                                                                                                                                                                                                                                                                                                       
|Other Closing Adjustments                                | (1                                                                                                                                                                                                                                                                                                                                       
|Gain on Divestitures                                     | $                                                                                                                                                                                                                                                                                                                                        

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