Goodwill and Intangibles (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in carrying amount of goodwill were as follows for the periods presented:



(In millions)	L&S		G&P			Total
Gross goodwill as of December 31, 2017	$	162	$	2,213		$	2,375
Accumulated impairment losses	—		(130		)	(130		)
Balance as of December 31, 2017	162		2,083			2,245
Acquisitions⁽¹⁾	7,072		699			7,771
Balance as of December 31, 2018	7,234		2,782			10,016
Impairment losses	—		(1,197		)	(1,197		)
Acquisitions⁽¹⁾	488		229			717
Balance as of December 31, 2019	7,722		1,814			9,536

Gross goodwill as of December 31, 2019	7,722		3,141			10,863
Accumulated impairment losses	—		(1,327		)	(1,327		)
Balance as of December 31, 2019	$	7,722	$	1,814		$	9,536


(1)	Acquisitions in 2018 are inclusive of the Mt. Airy Terminal acquisition as well as the Merger while acquisitions in 2019 are inclusive of measurement period adjustments related to the previously mentioned transactions.

Schedule of Acquired Finite-Lived Intangible Assets by Major Class

MPLX’s intangible assets are comprised of customer contracts and relationships. The weighted average amortization period for intangible assets acquired during 2019 was approximately 9 years. Gross intangible assets with accumulated amortization as of December 31, 2019 and 2018 is shown below:



		December 31, 2019							December 31, 2018
(In millions)	Useful Life	Gross		Accumulated Amortization⁽¹⁾			Net		Gross		Accumulated Amortization⁽¹⁾			Net
L&S	6 - 8 years	$	283	$	(45	)	$	238	$	249	$	(14	)	$	235
G&P	6 - 25 years	1,288		(256		)	1,032		1,253		(129		)	1,124
		$	1,571	$	(301	)	$	1,270	$	1,502	$	(143	)	$	1,359

(1)

Amortization expense attributable to the G&P segment for the years ended December 31, 2019 and 2018 was $127 million and $49 million, respectively. Amortization expense attributable to the L&S segment for the year ended December 31, 2019 and 2018 was $31 million and $14 million, respectively.

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Estimated future amortization expense related to the intangible assets at December 31, 2019 is as follows:



(In millions)
2020	$	155
2021	155
2022	155
2023	155
2024	150
Thereafter	500
Total	$	1,270