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Acquisitions and Dispositions - Acquisitions (Details)
$ in Millions
1 Months Ended 9 Months Ended
Feb. 14, 2017
USD ($)
a
bbl / d
market_interconnect
mi
Feb. 28, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Business Acquisition [Line Items]        
Cash paid in connection with acquisitions     $ 1,282 $ 282
Acquisition related costs     6  
ACC Acquisition        
Business Acquisition [Line Items]        
Cash paid in connection with acquisitions $ 1,217      
Length of gathering and transmission lines (in miles) | mi 515      
Number of market interconnects | market_interconnect 5      
Additional volume enhancements to gathering system (in bbl per day) | bbl / d 350,000      
Area of acreage dedications (in acres) | a 315,000      
Acquisition related costs     $ 6  
Propane marine terminal        
Business Acquisition [Line Items]        
Cash paid in connection with acquisitions   $ 41