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Debt - MPLX Senior Notes (Details) - Senior notes - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 23, 2019	Sep. 09, 2019	Jul. 30, 2019
ANDX
Debt Instrument [Line Items]
Long-term debt, gross		$ 690
ANDX | Senior Notes Due October 2019
Debt Instrument [Line Items]
Long-term debt, gross		500
Repayments of debt	$ 500
ANDX | Senior Notes Due October 2019
Debt Instrument [Line Items]
Interest paid	$ 14
MPLX LP
Debt Instrument [Line Items]
Long-term debt, gross		$ 3,060	$ 2,000
MPLX LP | ANDX
Debt Instrument [Line Items]
Long-term debt				$ 3,750

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- Definition

Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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