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Management Services Agreements [Abstract]

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The minimum portion of guaranteed volume that must be purchased to avoid a change in the contract.

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Number Of Active Agreements

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Number of Times for Automatic Renewal

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Number of Tanks

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The value of the noncash (or part noncash) consideration given or received(for example, liability, equity) in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period.

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Renewal Term Agreement

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Storage Capacity

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Term Of Agreements

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Date the credit facility first became available, in CCYY-MM-DD format.

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Base revenue, as contractually stipulated, for operating and managing another entity's business during the reporting period.

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Related Party Agreements and Transactions (Narrative) (Detail) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($) Agreement	Dec. 31, 2015 USD ($) Agreement bbl	Sep. 16, 2015 bbl	Dec. 31, 2015 USD ($) Agreement
Five Year Transportation Services Agreement [Member] \| Commercial Agreements [Member] \| Handling Crude Oil And Products [Member]
Commercial Agreements
Number of agreements	1	1		1
Ten Year Storage Services Agreement [Member] \| Commercial Agreements [Member] \| Storage Services Butane Cavern [Member]
Commercial Agreements
Number of agreements	1	1		1
MPC [Member]
Loan Agreement [Abstract]
Other Significant Noncash Transaction Value Of Consideration Given Or Received				$ 1
MPC [Member] \| Commercial Agreements [Member] \| Storage services tank farms [Member]
Commercial Agreements
Storage Capacity \| bbl		2,626,000	1,386,000
Number of Tanks		4
MPC [Member] \| Operating Agreements [Member]
Operating Agreements
Sales to related parties				$ 1
MPC [Member] \| Operating Agreements [Member] \| Minimum [Member]
Commercial Agreements
Duration of agreements (in years)				1 year
MPC [Member] \| Operating Agreements [Member] \| Maximum [Member]
Commercial Agreements
Duration of agreements (in years)				5 years
MPC [Member] \| Management Services Agreements [Member]
Commercial Agreements
Number of agreements \| Agreement	2	2		2
Management Services Agreements
Fees received for providing management services				$ 1
MPC [Member] \| Employee Services Agreements [Member]
Commercial Agreements
Number of agreements \| Agreement	2	2		2
MPC [Member] \| Ten Year Transportation Services Agreement [Member] \| Commercial Agreements [Member] \| Crude oil [Member]
Commercial Agreements
Number of agreements \| Agreement	3	3		3
Duration of agreements (in years)				10 years
MPC [Member] \| Ten Year Transportation Services Agreement [Member] \| Commercial Agreements [Member] \| Pipelines products [Member]
Commercial Agreements
Number of agreements \| Agreement	4	4		4
Duration of agreements (in years)				10 years
MPC [Member] \| Five Year Transportation Services Agreement [Member] \| Commercial Agreements [Member] \| Crude oil [Member]
Commercial Agreements
Number of agreements \| Agreement	1	1		1
Duration of agreements (in years)				5 years
MPC [Member] \| Five Year Transportation Services Agreement [Member] \| Commercial Agreements [Member] \| Handling Crude Oil And Products [Member]
Commercial Agreements
Duration of agreements (in years)				5 years
MPC [Member] \| Ten Year Storage Services Agreement [Member] \| Commercial Agreements [Member] \| Storage Services Butane Cavern [Member]
Commercial Agreements
Duration of agreements (in years)				10 years
MPC [Member] \| Three Year Storage Services Agreement [Member] \| Commercial Agreements [Member] \| Storage services tank farms [Member]
Commercial Agreements
Number of agreements \| Agreement	4	4		4
Duration of agreements (in years)				3 years
MPC [Member] \| Transportation Services Agreements [Member] \| Commercial Agreements [Member] \| Cornerstone pipeline system and Utica build out projects [Member]
Commercial Agreements
Duration of agreements (in years)				15 years
Number of renewals	2	2		2
Renewal term agreement				5 years
MPC [Member] \| Transportation Services Agreements [Member] \| Commercial Agreements [Member] \| Marine Transportation Services [Member]
Commercial Agreements
Duration of agreements (in years)				6 years
MPC [Member] \| Transportation Services Agreements [Member] \| Commercial Agreements [Member] \| Crude oil and product pipeline [Member]
Commercial Agreements
Number of renewals	2	2		2
Renewal term agreement				5 years
MPC [Member] \| Transportation Services Agreements [Member] \| Commercial Agreements [Member] \| Wood River To Patoka System And Barge Dock [Member]
Commercial Agreements
Number of renewals	4	4		4
Renewal term agreement				2 years
MPC [Member] \| Storage Services Agreements [Member] \| Commercial Agreements [Member] \| Storage services tank farms [Member]
Commercial Agreements
Renewal term agreement				1 year
MPC [Member] \| Guaranteed Supply Agreement [Member] \| Commercial Agreements [Member] \| Marine Transportation Services [Member]
Commercial Agreements
Minimum Purchase Requirement				90.00%
Hardin Street Marine [Member] \| Management Services Agreements [Member]
Operating Agreements
Sales to related parties				$ 13
Hardin Street Transportation LLC [Member] \| Operating Agreements [Member]
Commercial Agreements
Duration of agreements (in years)				1 year
Renewal term agreement				1 year
Operating Agreements
Sales to related parties				$ 12
Centennial Pipeline Llc [Member] \| MPC [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage	50.00%	50.00%		50.00%
Muskegon [Member] \| MPC [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage	60.00%	60.00%		60.00%
MarkWest Utica EMG [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage	60.00%	60.00%		60.00%
Ohio Gathering
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage	36.00%	36.00%		36.00%
MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C. [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage	67.00%	67.00%		67.00%
Ohio Condensate Company, LLC [Member]
Related Party Transaction [Line Items]
Equity Method Investment, Ownership Percentage	60.00%	60.00%		60.00%
Related Party Revolving Credit Agreement [Member] \| MPC Investment [Member]
Loan Agreement [Abstract]
Line of Credit Facility, Initiation Date	Dec. 04, 2015
Line of Credit Facility, Current Borrowing Capacity	$ 500	$ 500		$ 500
Expiration date	Dec. 04, 2020
Description of variable rate basis	LIBOR plus 1.50 percent
Proceeds from Long-term Lines of Credit	$ 301
Repayments of Long-term Lines of Credit	293
Long-term Debt, Gross	$ 8	$ 8		$ 8
Debt Instrument, Interest Rate, Effective Percentage	1.744%	1.744%		1.744%
Related Party Revolving Credit Agreement [Member] \| MPL Investment LLC [Member]
Loan Agreement [Abstract]
Line of Credit Facility, Current Borrowing Capacity	$ 50	$ 50		$ 50
Expiration date				Dec. 31, 2015