Equity-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

The following is a summary of phantom unit award activity of MPLX common units in 2019:



	Phantom Units
	Number of Units		Weighted Average Fair Value		Aggregate Intrinsic Value (In millions)
Outstanding at December 31, 2018	1,154,335		$	34.34
Granted	219,488		32.62
Legacy ANDX phantom units converted to MPLX phantom units at the Merger	208,533		43.64
Settled	(426,451	)	33.84
Forfeited	(46,337	)	33.63
Outstanding at December 31, 2019	1,109,568		35.97
Vested and expected to vest at December 31, 2019	1,104,552		35.98		$	28
Non-forfeitable at December 31, 2019⁽¹⁾	507,471		$	37.32	$	13

The following is a summary of the values related to phantom units:



	Phantom Units
	Intrinsic Value of Units Issued During the Period (in millions)		Weighted Average Grant Date Fair Value of Units Granted During the Period
2019	$	14	$	32.62
2018	18		33.84
2017	$	15	$	36.26

The following table presents a summary of the 2019 activity for performance unit awards to be settled in MPLX common units:

The following table provides a summary of the weighted average inputs used for these assumptions:



	2019	2018	2017
Risk-free interest rate	2.51%	N/A	1.52%
Look-back period	2.84 years	N/A	2.83 years
Expected volatility	25.01%	N/A	49.34%
Grant date fair value of performance units granted	$0.76	N/A	$0.90