XML 44 R4.htm IDEA: XBRL DOCUMENT v3.19.3

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Actuarial changes, tax	$ (14)	$ 24	$ (8)	$ 29
Prior service credit, tax	(3)	(3)	(14)	(7)
Other, tax	$ 0	$ (1)	$ (1)	$ (2)

X

- Definition

Amount of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to net prior service cost (credit) pension and other postretirement defined benefit plans.

+ References

No definition available.

+ Details

Name:	mpc_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetPriorServiceCostCreditAdjustmentTax
Namespace Prefix:	mpc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated other comprehensive income (loss) related to the net actuarial gain (loss) pension and other postretirement defined benefit plans.

+ References

No definition available.

+ Details

Name:	mpc_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetUnamortizedGainLossAdjustmentTax
Namespace Prefix:	mpc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Other Comprehensive Income, Other, Tax

+ References

No definition available.

+ Details

Name:	mpc_OtherComprehensiveIncomeOtherTax
Namespace Prefix:	mpc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration