v3.24.1.u1
Net Income Per Limited Partner Unit - Basic and Diluted Earnings Per Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent [1] $ 1,005 $ 943
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic 3 4
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted 3 4
Impact of redemption of Series B preferred units 0 5
Net Income (Loss) Available to Common Stockholders, Diluted $ 992 $ 906
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1 1
Weighted average units outstanding:    
Common - basic 1,008 1,001
Common - diluted 1,008 1,001
Net income attributable to MPLX LP per limited partner unit:    
Common - basic $ 0.98 $ 0.91
Common - diluted $ 0.98 $ 0.91
Series A Preferred Stock [Member]    
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Distributed Earnings $ 10 $ 23
Series B Preferred Stock [Member]    
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Distributed Earnings 0 5
Common Unit-holders Public    
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Net Income (Loss) Available to Common Stockholders, Basic $ 992 $ 906
[1] Allocation of net income attributable to MPLX LP assumes all earnings for the period have been distributed based on the distribution priorities applicable to the period.