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Consolidated Statements of Equity - USD ($)
$ in Millions
Total
MPC
Common Unitholders
Public
Common Unitholders
MPC
Common Unitholder GP
MPC
Class B Unitholders
Public
General Partner
MPC
Noncontrolling Interests
Beginning Balance (Predecessor) at Dec. 31, 2015 [1]   $ 692            
Beginning Balance at Dec. 31, 2015 $ 9,946 [1]   $ 7,691 $ 465   $ 266 $ 819 $ 13
Distributions to MPC from Predecessor | Predecessor   (104)            
Distributions to MPC from Predecessor   0            
Issuance of units under ATM Program 321   315       6  
Net income (loss) | Predecessor [1]   98            
Net income (loss) 49 [1]   (107) (28)     85 1
Allocation of MPC's net investment at acquisition | Predecessor   (332)            
Allocation of MPC's net investment at acquisition       669     (337)  
Distributions to unitholders and general partner (391)   (248) (57)     (86)  
Distributions to noncontrolling interests (1)             (1)
Contributions from noncontrolling interests 2             2
Non-cash contribution from MPC | Predecessor   334            
Non-cash contribution from MPC 334              
Equity-based compensation 5   5          
Deferred income tax impact from changes in equity 0   2 0     (2)  
Ending Balance (Predecessor) at Jun. 30, 2016 [1]   688            
Ending Balance at Jun. 30, 2016 10,161 [1]   7,658 1,049   266 485 15
Beginning Balance (Predecessor) at Dec. 31, 2016 [1]   791            
Beginning Balance at Dec. 31, 2016 11,110 [1]   8,086 1,069   133 1,013 18
Distributions to MPC from Predecessor | Predecessor   (113)            
Distributions to MPC from Predecessor   (1,511)   (430)     (1,081)  
Issuance of units under ATM Program 443   434       9  
Net income (loss) | Predecessor   36            
Net income (loss) 345   127 41 $ 3   136 2
Contribution from MPC | Predecessor   12            
Contribution from MPC 12     0     0  
Allocation of MPC's net investment at acquisition | Predecessor   $ (726)            
Allocation of MPC's net investment at acquisition 0     573 350   (197)  
Distributions to unitholders and general partner (505)   (289) (92) (2)   (122)  
Distributions to noncontrolling interests (2)             (2)
Contributions from noncontrolling interests 128             128
Equity-based compensation 2   2          
Ending Balance at Jun. 30, 2017 $ 9,909   $ 8,360 $ 1,161 $ 351 $ 133 $ (242) $ 146
[1] Financial information has been retrospectively adjusted for the acquisition of HST, WHC and MPLXT from MPC. See Notes 1 and 3.