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Master Limited Partnership (Tables)
 3 Months Ended
Mar. 31, 2022
Noncontrolling Interest [Line Items]  
Unit Repurchases
Total share repurchases were as follows for the respective periods:
Three Months Ended 
March 31,
(In millions, except per share data)20222021
Number of shares repurchased37 — 
Cash paid for shares repurchased$2,846 $— 
Average cost per share$75.88 $— 
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net As a result of equity transactions of MPLX, we are required to adjust non-controlling interest and additional paid-in capital. Changes in MPC’s additional paid-in capital resulting from changes in its ownership interests in MPLX were as follows:
Three Months Ended 
March 31,
(In millions)20222021
Decrease due to change in ownership$(37)$(35)
Tax impact12 31 
Decrease in MPC's additional paid-in capital, net of tax$(25)$(4)
MPLX LP  
Noncontrolling Interest [Line Items]  
Unit Repurchases
Total unit repurchases were as follows for the respective periods:
Three Months Ended 
March 31,
(In millions, except per share data)20222021
Number of common units repurchased3 6 
Cash paid for common units repurchased$100 $155 
Average cost per unit$32.06 $24.78