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Revenue ASC 606 Initial Application Period Cumulative Effect (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 $ 5,007    
Rental income                 349 $ 277 $ 298
Inventories $ 77       $ 65       77 65  
Long-term deferred revenue 80       42       80 42  
Long-term deferred revenue - related parties 43       43       43 43  
Property, plant and equipment, net 14,639       12,187       14,639 12,187  
Deferred revenue - related parties 51       43       51 43  
Total MPLX LP partners’ capital 6,708       9,827       6,708 9,827  
Rental cost of sales                 135 62 57
Depreciation and amortization [1]                 766 683 591
Net income 439 $ 516 $ 456 $ 423 241 $ 217 $ 191 $ 187 1,834 836 434
Other income                 7 6 7
Accounting Standards Update 2014-09 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Contract with Customer, Asset, Gross 4       4 [2]       4 4 [2]  
Long-term deferred revenue 10       5 [2]       10 5 [2]  
Long-term deferred revenue - related parties 42       43 [2]       42 43 [2]  
Deferred Revenue, Current 4       5 [2]       4 5 [2]  
Deferred revenue - related parties 50       42 [2]       50 42 [2]  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Rental income                 284    
Rental cost of sales                 70    
Depreciation and amortization                 767    
Net income                 1,832    
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Rental income                 65    
Rental cost of sales                 65    
Depreciation and amortization                 1    
Net income                 2    
Cumulative Adjusted 606 Balance [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Inventories         66         66  
Long-term deferred revenue         39         39  
Property, plant and equipment, net         12,184         12,184  
Inventories [Member] | Accounting Standards Update 2014-09 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Cumulative Effect of New Accounting Principle in Period of Adoption 2       1       2 1  
Property, Plant and Equipment [Member] | Accounting Standards Update 2014-09 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Cumulative Effect of New Accounting Principle in Period of Adoption         (3)         (3)  
Deferred Revenue, Noncurrent [Member] | Accounting Standards Update 2014-09 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Cumulative Effect of New Accounting Principle in Period of Adoption         (3)         (3)  
Public | Limited Partners Common Units                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total MPLX LP partners’ capital $ 8,336       8,379       8,336 8,379  
Public | Limited Partners Common Units | Cumulative Adjusted 606 Balance [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Total MPLX LP partners’ capital         8,380         8,380  
Public | Limited Partners Common Units | Equity [Member] | Accounting Standards Update 2014-09 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Cumulative Effect of New Accounting Principle in Period of Adoption         $ 1         1  
Service [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 1,704 1,156 958
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties                 2,159 1,082 936
Service [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 1,342    
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties                 2,166    
Service [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 362    
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties                 (7)    
Service, Other [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 198 0 0
Service, Other [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 0    
Service, Other [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 198    
Product [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 902 889 572
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue [3]                 897    
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties                 49 8 11
Product [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue                 982    
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties                 42    
Product [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Revenue from Contract with Customer, excluding Assessed Tax and Non-ASC 606 Revenue                 (85)    
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties                 7    
Oil and Gas, Refining and Marketing [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Cost of Goods and Services Sold                 948 [4] 528 454
Oil and Gas, Refining and Marketing [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Cost of Goods and Services Sold [4]                 579    
Oil and Gas, Refining and Marketing [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Cost of Goods and Services Sold [4]                 369    
Natural Gas, Midstream [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Cost of Goods and Services Sold                 845 $ 651 $ 448
Natural Gas, Midstream [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Cost of Goods and Services Sold                 740    
Natural Gas, Midstream [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Cost of Goods and Services Sold                 105    
Other Income [Member]                      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                      
Other income [5]                 $ 1,418    
[1] Depreciation and amortization attributable to L&S was $240 million, $163 million and $128 million for the years ended 2018, 2017 and 2016, respectively. Depreciation and amortization attributable to G&P was $526 million, $520 million and $463 million for 2018, 2017 and 2016, respectively.
[2] Balance represents ASC 606 portion of each respective line item.
[3] G&P “Product sales” for the year ended December 31, 2018 excludes approximately $5 million of impact related to derivative gains and mark-to-market adjustments.
[4] Excludes “Purchased product costs,” “Rental cost of sales,” “Purchases,” “Depreciation and amortization,” “General and administrative expenses,” and “Other taxes.”
[5] Non-ASC 606 Revenue includes rental income, income from equity method investments, derivative gains and losses, mark-to-market adjustments, and other income.