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Commitments and Contingencies (Details 3) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 1 Months Ended 33 Months Ended 1 Months Ended 19 Months Ended 1 Months Ended 12 Months Ended 2 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Minimum
Dec. 31, 2013
Maximum
Apr. 30, 2011
Rainbow pipeline
bbl
Dec. 31, 2013
Rainbow pipeline
Feb. 26, 2013
Rainbow pipeline
enforcementaction
Jun. 30, 2012
Rangeland Pipeline Release
bbl
Dec. 31, 2013
Rangeland Pipeline Release
Jul. 04, 2013
Rangeland Pipeline Release
enforcementaction
Feb. 28, 2013
Bay Springs Pipeline
bbl
Dec. 31, 2013
Bay Springs Pipeline
Jun. 30, 2013
Kemp River Pipeline Release
event
bbl
Dec. 31, 2013
Kemp River Pipeline Release
Environmental                            
Estimated environmental reserve $ 93 $ 96                        
Reserve for environmental liabilities, short-term 11 13                        
Reserve for environmental liabilities, long-term 82 83                        
Probable recoveries from insurers and third parties recorded as a receivable 10 42                        
Actual cash expenditures for environmental liabilities, period paid     3 years 5 years                    
Total estimated cost to clean up and remediate the site, before insurance recoveries                           15
Total cost to clean up and remediate the site, before insurance recoveries           70     46     6    
Estimated size of release (in barrels)         28,000     3,000     120   700  
Penalty or fines assessed                 $ 0          
Number of enforcement actions             4     4        
Number of events occurred                         2