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Investments and Noncontrolling Interests (Narrative) (Details)
bbl / d in Thousands, $ in Millions
 3 Months Ended 12 Months Ended
Jan. 01, 2017
USD ($)
bbl / d
Jun. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Feb. 28, 2013
USD ($)
Schedule of Equity Method Investments [Line Items]            
Total segment revenues and other income(1)     $ 99 $ 92 $ 86  
Contribution - fixed assets to joint venture [1]     0 337 0  
Current assets     897 559    
Current liabilities     1,186 1,304    
Contribution - common units issued [2]     4,236 1,133 669  
Distributions from unconsolidated affiliates - return of capital     $ 16 26 0  
MarkWest Utica EMG            
Schedule of Equity Method Investments [Line Items]            
NCI owners total funding commitment           $ 950
Percentage of capital required by reporting entity after NCI minimum contribution           100.00%
Aggregate contributions to VIE threshold           $ 2,000
Maximum percentage ownership interest in joint ventures     70.00%      
Threshold percentage for noncontrolling owners to make pro rata contributions     30.00%      
Maximum noncontrolling percentage of capital contributions until pro rata ownership threshhold is reached     10.00%      
Noncontrolling interest owners actual contribution     $ 1,200      
Contribution by the partnership     1,500      
Noncontrolling interest owners capital contribution preference threshold     500      
Noncontrolling owners accrual of preference amount     $ 0   16  
Percentage of aggregate investment balance     56.00%      
Total segment revenues and other income(1)     $ 17 17 16  
Equity method investment, ownership percentage     56.00%      
Ohio Gathering            
Schedule of Equity Method Investments [Line Items]            
Total segment revenues and other income(1)     $ 16 16 $ 15  
Equity method investment, ownership percentage     34.00%      
Sherwood Midstream LLC            
Schedule of Equity Method Investments [Line Items]            
Total segment revenues and other income(1)     $ 12 8    
Equity method investment, ownership percentage     50.00%      
Contribution - fixed assets to joint venture $ 134          
Payments to acquire interest in joint venture 20          
Sherwood Midstream LLC | Antero Midstream Partners L.P.            
Schedule of Equity Method Investments [Line Items]            
Payments to acquire interest in joint venture $ 154          
MarkWest Ohio Fractionation Company, L.L.C. [Member]            
Schedule of Equity Method Investments [Line Items]            
Capacity | bbl / d 20          
Current assets     $ 132      
Noncurrent assets     550      
Current liabilities     75      
Liabilities, Noncurrent     1      
MarkWest Ohio Fractionation Company, L.L.C. [Member] | Sherwood Midstream LLC            
Schedule of Equity Method Investments [Line Items]            
Payments to acquire interest in joint venture $ 126          
Sherwood Midstream Holdings            
Schedule of Equity Method Investments [Line Items]            
Proceeds From Sale Of Ownership Interest In Assets Sold By Company In Affiliate     $ 15      
Equity method investment, ownership percentage     80.00%      
Contribution - fixed assets to joint venture 203          
Contribution - common units issued 209 $ 10        
Basis difference     $ 14      
Gain (loss) on disposition of assets 2          
Distributions from unconsolidated affiliates - return of capital $ 45          
Ownership Interest In Assets Sold By Company In Affiliate     6.00%      
Sherwood Midstream Holdings | Sherwood Midstream LLC            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage 21.00%          
Payments to acquire interest in joint venture $ 44 $ 4        
Sherwood Midstream Holdings | Direct Ownership Interest            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage 79.00%   60.00%      
Sherwood Midstream Holdings | Indirect Ownership Interest            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage     20.20%      
Gathering and Processing [Member]            
Schedule of Equity Method Investments [Line Items]            
Basis difference     $ 1,000 1,000    
Basis difference, not amortized     459      
Logistics and Storage [Member]            
Schedule of Equity Method Investments [Line Items]            
Basis difference     114 $ 118    
Basis difference, not amortized     $ 39      
[1] Contribution of assets to Sherwood Midstream and Sherwood Midstream Holdings. See Note 5.
[2] For 2016, includes limited partner units issued to MPC as consideration in the acquisition of HSM. For 2017, includes limited and general partner units issued to MPC as consideration in the acquisitions of the joint-interests, HST, WHC and MPLXT. For 2018, includes limited and general partner units issued to MPC as consideration in the acquisition of Refining Logistics and Fuels Distribution. See Note 4.