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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.