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Equity (Units Outstanding) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 20, 2019
Jul. 30, 2019
Feb. 01, 2018
Mar. 01, 2017
May 13, 2016
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Stockholders Equity [Line Items]                                  
Number of units outstanding           1,058,355,471       794,089,518       1,058,355,471 794,089,518 415,438,793 368,555,271
Aggregate percentage of general partner interest     2.00% 2.00%                   2.00%      
Partners' Capital Account, Units, Converted                           (1,148,330) (264,413,309) (366,509)  
Total cash distributions declared                           $ 2,758 $ 2,060 $ 1,288  
Partners' Capital Account, Unit-based Payment Arrangement, Number of Units                           288,031 348,527 273,639  
Units issued                               14,129,589  
Limited Partners Common Units                                  
Stockholders Equity [Line Items]                                  
Number of units outstanding           1,058,355,471       794,089,518       1,058,355,471 794,089,518 407,130,020 357,193,288
Partners' Capital Account, Units, Converted     (275,000,000)                     (1,148,330) (275,000,000) (4,350,057)  
Total cash distributions declared [1]                           $ 2,635 $ 1,985 $ 895  
Partners' Capital Account, Unit-based Payment Arrangement, Number of Units                           288,031 348,387 268,167  
Units issued                           0   13,846,998  
Limited Partners Common Units | MPC                                  
Stockholders Equity [Line Items]                                  
Common units outstanding           666,000,000       505,000,000       666,000,000 505,000,000    
Limited Partners' Capital Account, Units Issued   161,000,000       666,000,000       505,000,000       666,000,000 505,000,000    
Total cash distributions declared           $ 446 $ 438 $ 431 $ 332 $ 327 $ 322 $ 316 $ 288        
General Partner And Limited Partner Units | MPC                                  
Stockholders Equity [Line Items]                                  
Common units outstanding           665,997,540               665,997,540      
General Partner Units                                  
Stockholders Equity [Line Items]                                  
Number of units outstanding [2]           0       0       0 0 8,308,773 7,371,105
Partners' Capital Account, Units, Converted [2]                           0 (10,586,691) (7,330)  
Partners' Capital Account, Unit-based Payment Arrangement, Number of Units [2]                           0 140 5,472  
Units issued [2]                               282,591  
Class B Units                                  
Stockholders Equity [Line Items]                                  
Number of units outstanding           0       0       0 0 0 3,990,878
Partners' Capital Account, Units, Converted                               (3,990,878)  
ANDX LP [Member] | Public                                  
Stockholders Equity [Line Items]                                  
Common Units Conversion Ratio - ANDX to MPLX   1.135                              
ANDX LP [Member] | Nonpublic [Member]                                  
Stockholders Equity [Line Items]                                  
Common Units Conversion Ratio - ANDX to MPLX   1.0328                              
Public | Limited Partners Common Units                                  
Stockholders Equity [Line Items]                                  
Common units outstanding           392,000,000       289,000,000       392,000,000 289,000,000    
Limited Partners' Capital Account, Units Issued   102,000,000       392,000,000       289,000,000       392,000,000 289,000,000    
Total cash distributions declared           $ 270 $ 266 $ 261 $ 191 $ 187 $ 185 $ 181 $ 179        
Series A Convertible Preferred Units                                  
Stockholders Equity [Line Items]                                  
Number of units outstanding           29,600,000               29,600,000      
Partners' Capital Account, Units, Converted (1,200,000)                                
Units issued         30,800,000                        
Series B Preferred Stock [Member] | MPLX LP [Member]                                  
Stockholders Equity [Line Items]                                  
Preferred Units, Outstanding   600,000       600,000               600,000      
TexNew Mex units [Member] | MPLX LP [Member]                                  
Stockholders Equity [Line Items]                                  
Common units outstanding   80,000                              
Total cash distributions declared                   $ 0       $ 1      
HST & WHC & MPLXT                                  
Stockholders Equity [Line Items]                                  
Partners' Capital Account, Units, Acquisitions                               13,224,873  
HST & WHC & MPLXT | Limited Partners Common Units                                  
Stockholders Equity [Line Items]                                  
Partners' Capital Account, Units, Acquisitions                               12,960,376  
HST & WHC & MPLXT | General Partner Units                                  
Stockholders Equity [Line Items]                                  
Partners' Capital Account, Units, Acquisitions       264,497                       264,497 [2]  
LOOP LOCAP SAX and Explorer Llc [Member]                                  
Stockholders Equity [Line Items]                                  
Partners' Capital Account, Units, Acquisitions                               18,888,912  
LOOP LOCAP SAX and Explorer Llc [Member] | Limited Partners Common Units                                  
Stockholders Equity [Line Items]                                  
Partners' Capital Account, Units, Acquisitions                               18,511,134  
LOOP LOCAP SAX and Explorer Llc [Member] | General Partner Units                                  
Stockholders Equity [Line Items]                                  
Partners' Capital Account, Units, Acquisitions [2]                               377,778  
Refining Logistics & Fuels Distribution [Member]                                  
Stockholders Equity [Line Items]                                  
Partners' Capital Account, Units, Acquisitions                             113,888,889    
Refining Logistics & Fuels Distribution [Member] | Limited Partners Common Units                                  
Stockholders Equity [Line Items]                                  
Partners' Capital Account, Units, Acquisitions                             111,611,111    
Refining Logistics & Fuels Distribution [Member] | General Partner Units                                  
Stockholders Equity [Line Items]                                  
Partners' Capital Account, Units, Acquisitions [2]                             2,277,778    
Refining Logistics & Fuels Distribution [Member] | MPLX LP [Member] | Limited Partners Common Units                                  
Stockholders Equity [Line Items]                                  
Partners' Capital Account, Units, Acquisitions     111,611,111                            
Refining Logistics & Fuels Distribution [Member] | MPLX LP [Member] | General Partner Units                                  
Stockholders Equity [Line Items]                                  
Partners' Capital Account, Units, Acquisitions     2,277,778                            
Andeavor Logistics [Member]                                  
Stockholders Equity [Line Items]                                  
Partners' Capital Account, Units, Acquisitions                           262,829,592      
Andeavor Logistics [Member] | Limited Partners Common Units                                  
Stockholders Equity [Line Items]                                  
Partners' Capital Account, Units, Acquisitions                           262,829,592      
Andeavor Logistics [Member] | General Partner Units                                  
Stockholders Equity [Line Items]                                  
Partners' Capital Account, Units, Acquisitions [2]                           0      
[1]
See Note 8 for distribution information.
[2]
Changes to the number of general partner units outstanding, other than changes due to contributions made to MPC for the acquisitions of HSM, HST, WHC, MPLXT, the Joint-Interest Acquisition and Refining Logistics and Fuels Distribution, are the result of cash contributions made by the general partner in order to maintain its two percent GP Interest.