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Investments and Noncontrolling Interests (Summary of Equity Method Investment Financial Information) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenue and other income |  | $ 1,836 | $ 1,227 |  | $ 382 |
Costs and expenses |  | 988 | 659 |  | 328 |
Income (loss) from operations |  | 848 | 568 |  | 54 |
Net income (loss) |  | 776 | 478 |  | 52 |
Income/(loss) from equity method investments | [1],[2] | 240 | 78 |  | (74) |
Current assets |  | 614 | 510 |  |  |
Noncurrent assets |  | 8,250 | 7,631 |  |  |
Current liabilities |  | 401 | 303 |  |  |
Noncurrent liabilities |  | 1,030 | 918 |  |  |
Ohio Condensate |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Impairment related to equity method investment from asset impairment and elimination of basis differential |  |  |  |  | 89 |
Ohio Gathering |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investment in subsidiary |  | 750 | 790 |  |  |
MarkWest Utica EMG |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenue and other income |  | 238 | 187 |  | 216 |
Costs and expenses |  | 184 | 97 |  | 100 |
Income (loss) from operations |  | 54 | 90 |  | 116 |
Net income (loss) |  | 53 | 90 |  | 114 |
Income/(loss) from equity method investments |  | (10) | 10 |  | 8 | [2]
Current assets |  | 82 | 65 |  |  |
Noncurrent assets |  | 1,939 | 2,077 | [3] |  |
Current liabilities |  | 28 | 39 |  |  |
Noncurrent liabilities |  | 3 | 3 |  |  |
Other VIEs |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenue and other income |  | 234 | 86 |  | 18 |
Costs and expenses |  | 95 | 42 |  | 111 |
Income (loss) from operations |  | 139 | 44 |  | (93) |
Net income (loss) |  | 139 | 43 |  | (93) |
Income/(loss) from equity method investments |  | 74 | 20 |  | (89) | [2],[4]
Current assets |  | 153 | 46 |  |  |
Noncurrent assets |  | 1,596 | 930 |  |  |
Current liabilities |  | 127 | 44 |  |  |
Noncurrent liabilities |  | 186 | 11 |  |  |
Non-VIEs |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Revenue and other income |  | 1,364 | 954 |  | 148 |
Costs and expenses |  | 709 | 520 |  | 117 |
Income (loss) from operations |  | 655 | 434 |  | 31 |
Net income (loss) |  | 584 | 345 |  | 31 |
Income/(loss) from equity method investments |  | 176 | 48 |  | $ 7 | [2]
Current assets |  | 379 | 399 |  |  |
Noncurrent assets |  | 4,715 | 4,624 |  |  |
Current liabilities |  | 246 | 220 |  |  |
Noncurrent liabilities |  | $ 841 | $ 904 |  |  |
[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] | MarkWest Utica EMG, L.L.C (“MarkWest Utica EMG”), noncurrent assets include its investment in its subsidiary Ohio Gathering Company, L.L.C. (“Ohio Gathering”), which does not appear elsewhere in this table. The investment was $750 million and $790 million as of December 31, 2018 and 2017, respectively.
[4] | Includes an impairment charge of $89 million for the year ended December 31, 2016 related to MPLX’s investment in Ohio Condensate Company, L.L.C., which does not appear separately in this table.

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