Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Share-Based Payment Arrangement [Abstract]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

The following table reflects activity related to our share-based compensation arrangements, including the converted awards related to the acquisition of Andeavor:

(Millions of dollars)	2022		2021		2020
Share-based compensation expense	$	153	$	88	$	100
Tax benefit recognized on share-based compensation expense	37		22		25
Cash received by MPC upon exercise of stock option awards	243		106		11
Tax benefit received for tax deductions for stock awards exercised	53		13		16

Summary of Stock Option Award Activity

The following is a summary of our common stock option activity in 2022: 

	Number of Shares	Weighted Average Exercise Price		Weighted Average Remaining Contractual Terms (in years)	Aggregate Intrinsic Value (Millions of dollars)
Outstanding at December 31, 2021	7,795,036	$	46.23
Exercised	(5,267,328)	46.16
Forfeited or expired	(38,474)	20.87
Outstanding at December 31, 2022	2,489,234	46.78
Vested and expected to vest at December 31, 2022	2,488,962	46.78		4.1	$	173
Exercisable at December 31, 2022	2,000,853	51.77		3.3	129

Summary of Restricted Stock Award Activity

The following is a summary of restricted stock and restricted stock unit award activity of our common stock in 2022:

	Restricted Stock			Restricted Stock Units
	Number of Shares	Weighted Average Grant Date Fair Value		Number of Units	Weighted Average Grant Date Fair Value
Unvested at December 31, 2021	194,629	$	60.95	2,313,919	$	35.84
Granted	—	—		653,378	75.81
Vested	(191,833)	60.98		(1,026,720)	34.24
Forfeited	(2,105)	60.92		(154,427)	47.64
Unvested at December 31, 2022	691	54.60		1,786,150	50.36

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity, Vested And Unvested

The following is a summary of the values related to restricted stock and restricted stock unit awards held by MPC employees and non-employee directors:

	Restricted Stock				Restricted Stock Units
	Intrinsic Value of Awards Vested During the Period (Millions of dollars)		Weighted Average Grant Date Fair Value of Awards Granted During the Period		Intrinsic Value of Awards Vested During the Period (Millions of dollars)		Weighted Average Grant Date Fair Value of Awards Granted During the Period
2022	$	17	$	—	$	99	$	75.81
2021	20		—		90		55.27
2020	18		56.49		59		22.82

Schedule of Performance Unit Awards

The following table presents a summary of the 2022 activity for performance unit awards to be settled in shares:

	Number of Units	Weighted Average Grant Date Fair Value
Unvested at December 31, 2021	6,255,283	$	0.78
Vested	(6,221,223)	0.77
Forfeited	(34,060)	0.89
Unvested at December 31, 2022	—	—

Schedule of Share-based Compensation, Performance Unit Awards, Valuation Assumptions

Performance units to be settled in MPC shares have a grant date fair value calculated using a Monte Carlo valuation model, which requires the input of subjective assumptions. The following table provides a summary of these assumptions:

	2020
Risk-free interest rate	0.9		%
Look-back period (in years)	2.8
Expected volatility	30.4		%
Grant date fair value of performance units granted	$	0.89