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Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenues and other income:        
Service revenue $ 286 $ 233 $ 546 $ 462
Service revenue - related parties 270 246 525 423
Rental income 70 71 139 141
Rental income - related parties 70 66 137 104
Product sales 191 137 394 237
Product sales - related parties 2 3 4 6
Gain (loss) on sale of assets 0 0 1 0
Income (loss) from equity method investments 1 (83) 6 [1] (78) [1]
Other income 1 1 3 3
Other income - related parties 25 24 47 45
Total revenues and other income 916 698 [2] 1,802 1,343 [2]
Costs and expenses:        
Cost of revenues (excludes items below) 139 113 252 207
Purchased product costs 140 114 271 193
Rental cost of sales 13 15 25 29
Rental cost of sales - related parties 1 1 1 1
Purchases - related parties 109 99 216 177
Depreciation and amortization 164 151 351 287
Impairment expense 0 1 0 130
General and administrative expenses 57 63 115 116
Other taxes 13 13 26 25
Total costs and expenses 636 570 [2] 1,257 1,165 [2]
Income from operations 280 128 [2] 545 178 [2]
Related party interest and other financial costs 0 0 0 1
Interest expense (net of amounts capitalized) 74 52 140 107
Other financial costs 13 12 25 24
Income before income taxes 193 64 [2] 380 46 [2]
Provision (benefit) for income taxes (2) 8 (2) 12
Net income 191 72 [2] 378 58 [2]
Less: Net income (loss) attributable to noncontrolling interest 1 1 2 1
Less: Net income attributable to Predecessor 0 52 36 98
Net income (loss) attributable to MPLX LP [3] 190 19 340 (41)
Less: Preferred unit distributions 17 9 33 9
Less: General partner’s interest in net income attributable to MPLX LP 74 46 136 85
Limited partners' interest in net income (loss) attributable to MPLX LP $ 99 $ (36) $ 171 $ (135)
Weighted average limited partner units outstanding:        
Common - basic (in shares) 416 355 409 331
Common - diluted (in shares) 421 355 413 331
Limited Partners Common Units [Member]        
Costs and expenses:        
Net income (loss) attributable to MPLX LP [3] $ 99 $ (35) $ 171 $ (135)
Net income (loss) attributable to MPLX LP per limited partner unit:        
Common - basic (in USD per unit) $ 0.26 $ (0.11) $ 0.46 $ (0.43)
Common - diluted (in USD per unit) $ 0.26 $ (0.11) $ 0.46 $ (0.43)
Weighted average limited partner units outstanding:        
Common - basic (in shares) 377 331 370 316
Common - diluted (in shares) 382 331 374 316
Cash distributions declared per limited partner common unit $ 0.5625 $ 0.5100 $ 1.1025 $ 1.0150
[1] Income (loss) from equity method investments includes the impact of any basis differential amortization or accretion.
[2] Financial information has been retrospectively adjusted for the acquisition of HST, WHC and MPLXT from MPC. See Notes 1 and 3.
[3] Allocation of net income (loss) attributable to MPLX LP assumes all earnings for the period had been distributed based on the current period distribution priorities.