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Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Aug. 14, 2017
Aug. 07, 2017
Jul. 26, 2017
Jul. 01, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stockholders Equity Note [Line Items]                
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest             2.00%  
Units converted [1]             172,063  
Issuance of units under ATM Program             $ 443 $ 321
Distributions declared (including IDRs)         $ 311 $ 231 $ 590 $ 431
Subsequent Event [Member]                
Stockholders Equity Note [Line Items]                
Equity Instruments Conversion Date       Jul. 01, 2017        
Distribution Made to Limited Partner, Declaration Date     Jul. 26, 2017          
Cash distributions declared per limited partner common unit     $ 0.5625          
Distributions declared (including IDRs)     $ 294          
Distribution Made to Limited Partner, Distribution Date Aug. 14, 2017              
Distribution Made to Limited Partner, Date of Record   Aug. 07, 2017            
ATM Program [Member]                
Stockholders Equity Note [Line Items]                
Issuance of units under the ATM Program [2]             12,921,085  
Class B Units [Member] | Subsequent Event [Member]                
Stockholders Equity Note [Line Items]                
Units converted       3,990,878        
Limited Partners Common Units [Member]                
Stockholders Equity Note [Line Items]                
Units converted [1]             168,622  
Cash distributions declared per limited partner common unit         $ 0.5625 $ 0.5100 $ 1.1025 $ 1.0150
Distributions declared (including IDRs) [3]         $ 218 $ 172 $ 416 $ 328
Limited Partners Common Units [Member] | Subsequent Event [Member]                
Stockholders Equity Note [Line Items]                
Units converted       4,350,057        
Limited Partners Common Units [Member] | ATM Program [Member]                
Stockholders Equity Note [Line Items]                
Issuance of units under the ATM Program [2]             12,662,663  
General Partner Units [Member]                
Stockholders Equity Note [Line Items]                
Units converted [1]             3,441  
Issuance of units under ATM Program             $ 1  
General Partner Units [Member] | ATM Program [Member]                
Stockholders Equity Note [Line Items]                
Issuance of units under ATM Program             $ 9  
Issuance of units under the ATM Program [2]             258,422  
[1] As a result of the unit-based compensation awards issued during the period, MPLX GP contributed less than $1 million in exchange for 3,441 general partner units to maintain its two percent GP Interest.
[2] As a result of common units issued under the ATM Program during the period, MPLX GP contributed $9 million in exchange for 258,422 general partner units to maintain its two percent GP Interest.
[3] See Note 7 for distribution information.