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Business Combinations (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 30, 2009
USD ($)
Mar. 31, 2014
refinery
Mar. 31, 2017
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2016
USD ($)
Nov. 30, 2016
mi
Aug. 31, 2014
MBbls
Aug. 31, 2009
Aug. 28, 2009
Business Acquisition [Line Items]                  
Number of refineries to which facility provides utilities and other services | refinery   1              
NGL Logistics System                  
Business Acquisition [Line Items]                  
Length of pipeline | mi           500      
PP&E provisionally recorded         $ 183        
Beaumont, Texas,Crude Oil And Petroleum Products Terminal, 7.1 Million-Barrel-Storage-Capacity | Midstream Segment                  
Business Acquisition [Line Items]                  
Storage capacity of terminal acquired, in barrels | MBbls             7.1    
Series of Individually Immaterial Business Acquisitions | Capital Expenditures And Investments                  
Business Acquisition [Line Items]                  
Consideration paid, net of cash acquired       $ 741          
Scenario, Forecast                  
Business Acquisition [Line Items]                  
Equity interest in acquiree, remeasurement gain     $ 420            
Merey Sweeny                  
Business Acquisition [Line Items]                  
Additional equity method ownership interest acquired in MSLP               50.00% 50.00%
Step acquisition, equity interest in acquiree, fair value $ 190