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Consolidated Statements of Equity and Series A Preferred Units (Consolidated Statements of Equity) - USD ($)
$ in Millions
Total
Common Unit-holders Public
Common Unit-holder MPC
Accumulated Other Comprehensive Income (Loss)
Non-controlling Interests
Beginning Balance at Dec. 31, 2023 $ 12,689 $ 8,700 $ 3,758 $ (4) $ 235
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 1,005 355 640 0 10
Unit repurchases (75) (75) 0 0 0
Conversion of Series A preferred units 321 321 0 0 0
Distributions (864) (303) (550) 0  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders         (11)
Contributions 10 0 10 0 0
Other 0 (1) 0 1 0
Ending Balance at Mar. 31, 2024 13,086 8,997 3,858 (3) 234
Beginning Balance at Dec. 31, 2024 13,807 9,322 4,257 (3) 231
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 1,136 410 716 0 10
Unit repurchases (100) (100) 0 0 0
Conversion of Series A preferred units 197 197 0 0 0
Distributions (983) (353) (619) 0  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders         (11)
Contributions 7 0 7 0 0
Other 4 (4) 0 8 0
Ending Balance at Mar. 31, 2025 $ 14,068 $ 9,472 $ 4,361 $ 5 $ 230