| MPLX LP |
| Q4-CY2025 | Q3-CY2025 | Q2-CY2025 | Q1-CY2025 | Q4-CY2024 | Q3-CY2024 | Q2-CY2024 | Q1-CY2024 | Q4-CY2023 | Q3-CY2023 | Q2-CY2023 | Q1-CY2023 | Q4-CY2022 | Q3-CY2022 | Q2-CY2022 | Q1-CY2022 | Q4-CY2021 | Q3-CY2021 | Q2-CY2021 | Q1-CY2021 | Q4-CY2020 | Q3-CY2020 | Q2-CY2020 | Q1-CY2020 | Q4-CY2019 | Q3-CY2019 | Q2-CY2019 | Q1-CY2019 | Q4-CY2018 | Q3-CY2018 | Q2-CY2018 | Q1-CY2018 | Q4-CY2017 | Q3-CY2017 | Q2-CY2017 | Q1-CY2017 | Q4-CY2016 | Q3-CY2016 | Q2-CY2016 | Q1-CY2016 | Q4-CY2015 | Q3-CY2015 | Q2-CY2015 | Q1-CY2015 | Q4-CY2014 | Q3-CY2014 | Q2-CY2014 | Q1-CY2014 | Q4-CY2013 |
| Balance Sheet Date | | | 2025-Jun-30 | 2025-Mar-31 | 2024-Dec-31 | 2024-Sep-30 | 2024-Jun-30 | 2024-Mar-31 | 2023-Dec-31 | 2023-Sep-30 | 2023-Jun-30 | 2023-Mar-31 | 2022-Dec-31 | 2022-Sep-30 | 2022-Jun-30 | 2022-Mar-31 | 2021-Dec-31 | 2021-Sep-30 | 2021-Jun-30 | 2021-Mar-31 | 2020-Dec-31 | 2020-Sep-30 | 2020-Jun-30 | 2020-Mar-31 | 2019-Dec-31 | 2019-Sep-30 | 2019-Jun-30 | 2019-Mar-31 | 2018-Dec-31 | 2018-Sep-30 | 2018-Jun-30 | 2018-Mar-31 | 2017-Dec-31 | 2017-Sep-30 | 2017-Jun-30 | 2017-Mar-31 | 2016-Dec-31 | 2016-Sep-30 | 2016-Jun-30 | 2016-Mar-31 | 2015-Dec-31 | 2015-Sep-30 | 2015-Jun-30 | 2015-Mar-31 | 2014-Dec-31 | 2014-Sep-30 | 2014-Jun-30 | 2014-Mar-31 | 2013-Dec-31 |
| Fiscal Period | | | Q2-FY2025 | Q1-FY2025 | Q4-FY2024 | Q3-FY2024 | Q2-FY2024 | Q1-FY2024 | Q4-FY2023 | Q3-FY2023 | Q2-FY2023 | Q1-FY2023 | Q4-FY2022 | Q3-FY2022 | Q2-FY2022 | Q1-FY2022 | Q4-FY2021 | Q3-FY2021 | Q2-FY2021 | Q1-FY2021 | Q4-FY2020 | Q3-FY2020 | Q2-FY2020 | Q1-FY2020 | Q4-FY2019 | Q3-FY2019 | Q2-FY2019 | Q1-FY2019 | Q4-FY2018 | Q3-FY2018 | Q2-FY2018 | Q1-FY2018 | Q4-FY2017 | Q3-FY2017 | Q2-FY2017 | Q1-FY2017 | Q4-FY2016 | Q3-FY2016 | Q2-FY2016 | Q1-FY2016 | Q4-FY2015 | Q3-FY2015 | Q2-FY2015 | Q1-FY2015 | Q4-FY2014 | Q3-FY2014 | Q2-FY2014 | Q1-FY2014 | Q4-FY2013 |
| Operating Cash Flow | | | 1,736,000,000$ | 1,246,000,000$ | 1,675,000,000$ | 1,415,000,000$ | 1,565,000,000$ | 1,291,000,000$ | 1,489,000,000$ | 1,244,000,000$ | 1,437,000,000$ | 1,227,000,000$ | 1,368,000,000$ | 1,039,000,000$ | 1,487,000,000$ | 1,125,000,000$ | 1,240,000,000$ | 1,182,000,000$ | 1,365,000,000$ | 1,124,000,000$ | 1,185,000,000$ | 1,222,000,000$ | 1,105,000,000$ | 1,009,000,000$ | 1,092,000,000$ | 1,538,000,000$ | 1,101,000,000$ | 853,000,000$ | 1,044,000,000$ | 737,000,000$ | 840,000,000$ | 450,000,000$ | 569,000,000$ | 494,000,000$ | 467,000,000$ | 377,000,000$ | 516,000,000$ | 305,000,000$ | 349,000,000$ | 321,000,000$ | 169,000,000$ | 85,000,000$ | 101,000,000$ | 72,000,000$ | 143,700,000$ | 61,900,000$ | 56,500,000$ | 71,900,000$ | 44,900,000$ |
| Investing Cash Flow | | | (602,000,000$) | (601,000,000$) | (349,000,000$) | (536,000,000$) | (114,000,000$) | (996,000,000$) | (525,000,000$) | (236,000,000$) | (271,000,000$) | (220,000,000$) | (280,000,000$) | (265,000,000$) | (135,000,000$) | (276,000,000$) | (141,000,000$) | (132,000,000$) | (155,000,000$) | (90,000,000$) | (202,000,000$) | (283,000,000$) | (415,000,000$) | (362,000,000$) | (874,000,000$) | (1,014,000,000$) | (739,000,000$) | (700,000,000$) | (851,000,000$) | (1,073,000,000$) | (464,000,000$) | (490,000,000$) | (472,000,000$) | (431,000,000$) | (450,000,000$) | (955,000,000$) | (525,000,000$) | (289,000,000$) | (337,000,000$) | (266,000,000$) | (1,495,000,000$) | (82,000,000$) | (66,000,000$) | (43,000,000$) | (93,900,000$) | (33,700,000$) | (2,800,000$) | (6,600,000$) | (33,000,000$) |
| Financing Cash Flow | | | (2,282,000,000$) | 370,000,000$ | (2,233,000,000$) | (954,000,000$) | 665,000,000$ | (958,000,000$) | (876,000,000$) | (803,000,000$) | (804,000,000$) | (852,000,000$) | (971,000,000$) | (951,000,000$) | (1,096,000,000$) | (820,000,000$) | (1,125,000,000$) | (1,019,000,000$) | (1,226,000,000$) | (1,025,000,000$) | (996,000,000$) | (978,000,000$) | (680,000,000$) | (605,000,000$) | (244,000,000$) | (499,000,000$) | (452,000,000$) | (116,000,000$) | (147,000,000$) | 366,000,000$ | (373,000,000$) | 37,000,000$ | (97,000,000$) | (351,000,000$) | 12,000,000$ | 607,000,000$ | 31,000,000$ | 157,000,000$ | 19,000,000$ | (94,000,000$) | 1,279,000,000$ | (43,000,000$) | (37,000,000$) | 76,000,000$ | (54,900,000$) | (39,200,000$) | (51,100,000$) | (78,800,000$) | (45,100,000$) |
| End Cash Position | | | 1,386,000,000$ | 2,534,000,000$ | 1,519,000,000$ | 2,426,000,000$ | 2,501,000,000$ | 385,000,000$ | 1,048,000,000$ | 960,000,000$ | 755,000,000$ | 393,000,000$ | 238,000,000$ | 121,000,000$ | 298,000,000$ | 42,000,000$ | 13,000,000$ | 39,000,000$ | 8,000,000$ | 24,000,000$ | 15,000,000$ | 28,000,000$ | 67,000,000$ | 57,000,000$ | 15,000,000$ | 41,000,000$ | 7,000,000$ | 93,000,000$ | 77,000,000$ | 37,000,000$ | 3,000,000$ | 2,000,000$ | 5,000,000$ | 3,000,000$ | 293,000,000$ | 265,000,000$ | 234,000,000$ | 208,000,000$ | 35,000,000$ | 4,000,000$ | 43,000,000$ | 90,000,000$ | 130,000,000$ | 132,000,000$ | 27,000,000$ | 32,200,000$ | 43,200,000$ | 43,200,000$ | 54,000,000$ |
| Exchange Rate Effect | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| Dividends Paid | | | 0$ | 6,000,000$ | | | 10,000,000$ | 23,000,000$ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |