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Acquisitions Acquisitions (Acquisition Mt. Airy Terminal) (Details) bbl / d in Thousands, bbl in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Sep. 26, 2018 USD ($) bbl / d bbl | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) shares
Business Acquisition [Line Items] |  |  |  |  |
Intangibles, net |  |  | $ 424 | $ 453 |
Goodwill |  |  | 2,586 | 2,245 | $ 2,245
Income/(loss) from equity method investments | [1],[2] |  | $ 240 | $ 78 | $ (74)
Partners' Capital Account, Units, Acquisitions | shares |  |  |  |  | 22,993,880
Mt. Airy Terminal [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  | $ 3 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |  | 1 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 336 |  |  |
Intangibles, net |  | 9 |  |  |
Goodwill |  | 126 |  |  |
Payments to Acquire Businesses, Gross |  | $ 451 |  |  |
Storage Capacity | bbl |  | 4 |  |  |
Barrels Handled | bbl / d |  | 0 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  | $ (17) |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other |  | (7) |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest |  | $ 451 |  |  |
[1] | Includes an impairment expense of $89 million related to one of MPLX’s equity method investments for the year ended December 31, 2016.
[2] | “Income/(loss) from equity method investments” includes the impact of any basis differential amortization or accretion.

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