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Related Party Agreements and Transactions (Narrative) (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Apr. 26, 2018 USD ($)
Loan Agreement [Abstract] |  |  |  |
Revenue from related parties | $ 5 | $ 11 |  |
Purchases from related parties | 8 | 44 |  |
MPC |  |  |  |
Loan Agreement [Abstract] |  |  |  |
Prepaid insurance | 1 | 8 |  |
Purchases from related parties | 168 | 3 | $ 0 |
MPC Investment | Related Party Revolving Credit Agreement |  |  |  |
Loan Agreement [Abstract] |  |  |  |
Current borrowing capacity | $ 1,000 |  |  | $ 500
Expiration date | Dec. 04, 2020 |  |  |
Description of variable rate basis | LIBOR plus 1.50 percent |  |  |
Proceeds from lines of credit | $ 4,000 | 2,400 |  |
Repayments of lines of credit | 4,300 | 2,000 |  |
Outstanding balance | $ 0 | $ 386 |  |
Interest rate during period | 3.473% | 2.777% |  |
Commercial Agreements | MPC | Transportation Services Agreements [Member] | Minimum | Crude oil and product pipeline |  |  |  |
Commercial Agreements |  |  |  |
Term Of Agreements | 5 years |  |  |
Automatic renewal term agreement | 2 years |  |  |
Commercial Agreements | MPC | Transportation Services Agreements [Member] | Maximum | Crude oil and product pipeline |  |  |  |
Commercial Agreements |  |  |  |
Term Of Agreements | 15 years |  |  |
Automatic renewal term agreement | 5 years |  |  |
Commercial Agreements | MPC | Five Year Transportation Services Agreement [Member] | Handling crude oil and products |  |  |  |
Commercial Agreements |  |  |  |
Term Of Agreements | 5 years |  |  |
Commercial Agreements | MPC | Six Year Transportation Services Agreement [Member] | Providing marine transportation of crude oil, feedstocks and refined petroleum products, and related services |  |  |  |
Commercial Agreements |  |  |  |
Term Of Agreements | 6 years |  |  |
Commercial Agreements | MPC | Ten Year Storage Services Agreement [Member] | Storage services tank farms |  |  |  |
Commercial Agreements |  |  |  |
Term Of Agreements | 10 years |  |  |
Commercial Agreements | MPC | Seventeen Year Storage Services Agreement [Member] | Storage services tank farms |  |  |  |
Commercial Agreements |  |  |  |
Term Of Agreements | 17 years |  |  |
Commercial Agreements | MPC | Three Year Storage Services Agreement [Member] | Storage services tank farms |  |  |  |
Commercial Agreements |  |  |  |
Renewal term agreement | 5 years |  |  |
Term Of Agreements | 3 years |  |  |
Commercial Agreements | MPC | Three Year Storage Services Agreement [Member] | Crude oil and product pipeline |  |  |  |
Commercial Agreements |  |  |  |
Term Of Agreements | 3 years |  |  |
Commercial Agreements | MPC | Storage Services Agreements | Storage services tank farms |  |  |  |
Commercial Agreements |  |  |  |
Renewal term agreement | 5 years |  |  |
Automatic renewal term agreement | 1 year |  |  |
Commercial Agreements | MPC | Storage Services Agreements | Minimum | Storage services tank farms |  |  |  |
Commercial Agreements |  |  |  |
Automatic renewal term agreement | 0 years |  |  |
Commercial Agreements | MPC | Storage Services Agreements | Maximum | Storage services tank farms |  |  |  |
Commercial Agreements |  |  |  |
Automatic renewal term agreement | 10 years |  |  |
Commercial Agreements | MPC | Ten Year Terminal Services Agreement [Member] | Refined products |  |  |  |
Commercial Agreements |  |  |  |
Term Of Agreements | 10 years |  |  |
Commercial Agreements | MPC | Terminal Services Agreements | Minimum | Refined products |  |  |  |
Commercial Agreements |  |  |  |
Automatic renewal term agreement | 2 years |  |  |
Commercial Agreements | MPC | Terminal Services Agreements | Maximum | Refined products |  |  |  |
Commercial Agreements |  |  |  |
Automatic renewal term agreement | 5 years |  |  |
Commercial Agreements | MPC | Management Services Agreements [Member] | Co-location Agreements [Member] |  |  |  |
Commercial Agreements |  |  |  |
Term Of Agreements | 50 years |  |  |
Commercial Agreements | MPC | Management Services Agreements [Member] | Marine Management Services [Member] |  |  |  |
Commercial Agreements |  |  |  |
Automatic renewal term agreement | 5 years |  |  |
Number of renewals | 2 |  |  |
Commercial Agreements | MPC | Lease Agreements [Member] | Management Services Agreements [Member] |  |  |  |
Commercial Agreements |  |  |  |
Term Of Agreements | 50 years |  |  |
Operating Agreements | MPC | Minimum |  |  |  |
Commercial Agreements |  |  |  |
Term Of Agreements | 1 year |  |  |
Operating Agreements | MPC | Maximum |  |  |  |
Commercial Agreements |  |  |  |
Term Of Agreements | 5 years |  |  |
MarkWest Utica EMG |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity method investment, ownership percentage | 56.00% |  |  |
Ohio Gathering |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity method investment, ownership percentage | 34.00% |  |  |
Sherwood Midstream LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |
Sherwood Midstream Holdings |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity method investment, ownership percentage | 80.00% |  |  |
Jefferson Dry Gas |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Equity method investment, ownership percentage | 67.00% |  |  |

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