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v3.19.3

Leases Lessee Narrative (Details) | 9 Months Ended
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Sep. 30, 2019
Minimum |
Term of agreements | 1 year
Renewal term options | 1 year
Maximum |
Term of agreements | 60 years
Renewal term options | 50 years

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- Definition Renewal Term Agreement + References No definition available. + Details
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Namespace Prefix: | mpc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Term Of Agreements + References No definition available. + Details
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Namespace Prefix: | mpc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |