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Acquisitions and Divestitures - Acquisitions (Details)
$ in Millions
1 Months Ended 11 Months Ended 12 Months Ended
Feb. 14, 2017
USD ($)
a
contract
market_interconnect
mi
Feb. 28, 2017
USD ($)
Dec. 31, 2017
bbl / d
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
acquisition
Business Acquisition [Line Items]            
Cash consideration         $ 1,280 $ 282
Amortization expense for finite-lived intangible assets       $ 66 54 44
Acquisition-related expenses       $ 0 6 0
Goodwill recognized         269  
Alpha Holding Company, LLC            
Business Acquisition [Line Items]            
Cash consideration $ 1,215          
Length of gathering and transmission lines (in miles) | mi 515          
Number of market interconnects | market_interconnect 5          
Additional volume enhancements to gathering system (bbls per day) | bbl / d     350,000      
Area of acreage dedication (gross acres) | a 315,000          
Weighted-average useful life 20 years          
Acquisition-related expenses         6  
Propane Marine Terminal            
Business Acquisition [Line Items]            
Cash consideration   $ 41        
Individually immaterial business acquisitions            
Business Acquisition [Line Items]            
Cash consideration           $ 289
Number of acquisitions completed | acquisition           2
Goodwill recognized           $ 0
Integrated System Of NGL Assets            
Business Acquisition [Line Items]            
Cash consideration           $ 204
Advantage Joint Venture            
Business Acquisition [Line Items]            
Ownership interest       50.00%    
Acreage Dedication Contracts | Alpha Holding Company, LLC            
Business Acquisition [Line Items]            
Number of acreage dedication contracts acquired | contract 5          
Weighted-average useful life 20 years          
Amortization expense for finite-lived intangible assets       $ 25 $ 10