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Consolidated Statements of Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Common Unit-holder MPC
Series B Preferred Unit-holders
Accumulated Other Comprehensive Loss
Non-controlling Interests
Series A Preferred Unit-holders
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests             $ 968
Beginning Balance at Dec. 31, 2020 $ 13,017 $ 9,384 $ 2,792 $ 611 $ (15) $ 245  
Net income (3,012) (1,087) (1,849) (41) 0 (35)  
Unit repurchases (630) (630) 0 0 0 0  
Conversion of Series A preferred units 3 3 0 0 0 0  
Distributions (3,512) (1,269) (2,163) (41) 0    
Distributions to Noncontrolling Interest Holders           39  
Contributions 160 0 160 0 0 0  
Stockholders' Equity, Other 2 4 0 0 (2) 0  
Temporary Equity Account, Distributions             100
Net income allocated             100
Temporary Equity, Other Changes             3
Ending Balance at Dec. 31, 2021 12,052 8,579 2,638 611 (17) 241  
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests             965
Net income (3,890) (1,371) (2,444) (41) 0 (34)  
Unit repurchases (491) (491) 0 0 0 0  
Distributions (3,000) (1,050) (1,871) (41) 0    
Distributions to Noncontrolling Interest Holders           38  
Contributions 82 0 82 0 0 0  
Stockholders' Equity, Other 13 4 0 0 9 0  
Temporary Equity Account, Distributions             85
Net income allocated             88
Ending Balance at Dec. 31, 2022 12,546 8,413 3,293 611 (8) 237  
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests 968           968
Net income (3,872) (1,336) (2,493) (5) 0 (38)  
Conversion of Series A preferred units 73 73 0 0 0 0  
Partners' Capital Account, Redemptions (600) (2) (3) (595) 0 0  
Distributions (3,243) (1,125) (2,056) (21) 0    
Distributions to Noncontrolling Interest Holders           41  
Contributions 31 0 31 0 0 0  
Stockholders' Equity, Other 10 5 0 0 4 1  
Temporary Equity Account, Distributions             94
Net income allocated             94
Temporary Equity, Other Changes             73
Ending Balance at Dec. 31, 2023 12,689 $ 8,700 $ 3,758 $ 0 $ (4) $ 235  
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests $ 895           $ 895