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Goodwill and Intangibles (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | 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, 2016 | $ | 162 |  |  | $ | 2,213 |  |  | $ | 2,375 |
Accumulated impairment losses | — |  |  | (130 | ) |  | (130 | )
Balance as of December 31, 2016 | 162 |  |  | 2,083 |  |  | 2,245 |
Impairment losses | — |  |  | — |  |  | — |
Acquisitions | — |  |  | — |  |  | — |
Balance as of December 31, 2017 | 162 |  |  | 2,083 |  |  | 2,245 |
Impairment losses | — |  |  | — |  |  | — |
Acquisitions | 341 |  |  | — |  |  | 341 |
Balance as of December 31, 2018 | $ | 503 |  |  | $ | 2,083 |  |  | $ | 2,586 |
Gross goodwill as of December 31, 2018 | $ | 503 |  |  | $ | 2,213 |  |  | $ | 2,716 |
Accumulated impairment losses | — |  |  | (130 | ) |  | (130 | )
Balance as of December 31, 2018 | $ | 503 |  |  | $ | 2,083 |  |  | $ | 2,586 |
Schedule of Acquired Finite-Lived Intangible Assets by Major Class | MPLX’s intangible assets are comprised of customer contracts and relationships, gross intangible assets with accumulated amortization as of December 31, 2018 and 2017 is shown below:
|  |  |  | December 31, 2018 |  | December 31, 2017
(In millions) |  | Useful Life |  | Gross |  | Accumulated Amortization(1) |  | Net |  | Gross |  | Accumulated Amortization(1) |  | Net
L&S |  | 4-6 years |  | $ | 9 |  |  | $ | — |  |  | $ | 9 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
G&P |  | 11-25 years |  | 533 |  |  | (118 | ) |  | 415 |  |  | 533 |  |  | (80 | ) |  | 453 |
|  |  |  | $ | 542 |  |  | $ | (118 | ) |  | $ | 424 |  |  | $ | 533 |  |  | $ | (80 | ) |  | $ | 453 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | Estimated future amortization expense related to the intangible assets at December 31, 2018 is as follows:
(In millions) |  |
2019 |  | $ | 40 |
2020 |  | 40 |
2021 |  | 40 |
2022 |  | 39 |
2023 |  | 39 |
Thereafter |  | 226 |
Total |  | $ | 424 |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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