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Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues and other income:      
Revenue from Contract with Customer, Excluding Assessed Tax $ 5,007    
Rental income 349 $ 277 $ 298
Rental income - related parties 718 279 235
Income/(loss) from equity method investments [1],[2] 240 78 (74)
Other income 7 6 7
Other income - related parties 99 92 86
Total revenues and other income 6,425 3,867 3,029
Costs and expenses:      
Rental cost of sales 135 62 57
Rental cost of sales - related parties 5 2 1
Purchases - related parties 860 455 388
Depreciation and amortization [3] 766 683 591
Impairment expense 0 0 130
General and administrative expenses 291 241 227
Other taxes 72 54 50
Total costs and expenses 3,922 2,676 2,346
Income from operations 2,503 1,191 683
Related party interest and other financial costs 5 2 1
Interest expense (net of amounts capitalized of $33 million, $32 million, and $28 million, respectively) 534 296 210
Other financial costs 122 56 50
Income before income taxes 1,842 837 422
Provision/(benefit) for income taxes 8 1 (12)
Net income 1,834 836 434
Less: Net income attributable to noncontrolling interests 16 6 2
Less: Net income attributable to Predecessor 0 36 199
Net income attributable to MPLX LP [4] 1,818 794 233
Less: Preferred unit distributions 75 65 41
Less: General partner’s interest in net income attributable to MPLX LP 0 318 191
Limited partners’ interest in net income attributable to MPLX LP $ 1,743 $ 411 $ 1
Weighted average limited partner units outstanding:      
Common - basic (in units) 761 393 338
Common - diluted (in units) 761 396 345
Limited Partners Common Units      
Costs and expenses:      
Net income attributable to MPLX LP [4] $ 1,743 $ 411 $ 1
Net income attributable to MPLX LP per limited partner unit:      
Common - basic (in USD per unit) $ 2.29 $ 1.07 $ 0.00
Common - diluted (in USD per unit) $ 2.29 $ 1.06 $ 0.00
Weighted average limited partner units outstanding:      
Common - basic (in units) 761 385 331
Common - diluted (in units) 761 388 338
Service [Member]      
Revenues and other income:      
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
Product [Member]      
Revenues and other income:      
Revenue from Contract with Customer, Excluding Assessed Tax 902 889 572
Revenue from Contract with Customer, Excluding Assessed Tax, Related Parties 49 8 11
Oil and Gas, Refining and Marketing [Member]      
Costs and expenses:      
Cost of Goods and Services Sold 948 [5] 528 454
Natural Gas, Midstream [Member]      
Costs and expenses:      
Cost of Goods and Services Sold 845 651 448
Service, Other [Member]      
Revenues and other income:      
Revenue from Contract with Customer, Excluding Assessed Tax $ 198 $ 0 $ 0
[1] Includes an impairment expense of $89 million related to one of MPLX’s equity method investments for the year ended December 31, 2016.
[2] “Income/(loss) from equity method investments” includes the impact of any basis differential amortization or accretion.
[3] 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.
[4] Allocation of net income/(loss) attributable to MPLX LP assumes all earnings for the period were distributed based on the current period distribution priorities.
[5] Excludes “Purchased product costs,” “Rental cost of sales,” “Purchases,” “Depreciation and amortization,” “General and administrative expenses,” and “Other taxes.”