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Master Limited Partnership (Tables)
 12 Months Ended
Dec. 31, 2022
Noncontrolling Interest [Line Items]  
Unit Repurchases
Total share repurchases were as follows for the respective periods:
(In millions, except per share data)202220212020
Number of shares repurchased131 76 — 
Cash paid for shares repurchased$11,922 $4,654 $— 
Average cost per share$91.20 $62.65 $— 
Noncontrolling Interest
As a result of equity transactions of MPLX, we are required to adjust non-controlling interest and additional paid-in capital. Changes in MPC’s additional paid-in capital resulting from changes in its ownership interest in MPLX were as follows:
(Millions of dollars)202220212020
Decrease due to change in ownership$(164)$(166)$(27)
Tax impact44 73 (14)
Decrease in MPC's additional paid-in capital, net of tax$(120)$(93)$(41)
MPLX  
Noncontrolling Interest [Line Items]  
Unit Repurchases
Total unit repurchases were as follows for the respective periods:
(In millions, except per share data)202220212020
Number of common units repurchased15 23 1 
Cash paid for common units repurchased$491 $630 $33 
Average cost per unit$31.96 $27.52 $22.29