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Investments and Noncontrolling Interest (Equity Method Investments) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Sep. 01, 2017 | Jan. 01, 2017
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Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 4,174 | $ 4,010 |  |
Centrahoma Processing LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 40.00% |  |  |
Equity method investments | $ 160 | 121 |  |
Explorer |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 25.00% |  | 25.00% |
Equity method investments | $ 90 | 89 |  |
Illinois Extension |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 35.00% |  | 35.00% |
Equity method investments | $ 275 | 284 |  |
LOCAP |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 59.00% |  | 59.00% |
Equity method investments | $ 27 | 24 |  |
LOOP |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 41.00% |  | 41.00% |
Equity method investments | $ 226 | 225 |  |
MarEn Bakken |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 25.00% |  |  |
Equity method investments | $ 498 | 520 |  |
Jefferson Dry Gas |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 67.00% |  |  |
Equity method investments | $ 236 | 164 |  |
MarkWest Utica EMG |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 56.00% |  |  |
Equity method investments | $ 2,039 | 2,139 |  |
Sherwood Midstream LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |
Equity method investments | $ 366 | 236 |  |
Sherwood Midstream Holdings |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 80.00% |  |  |
Equity method investments | $ 157 | 165 |  |
Sherwood Midstream Holdings | Direct Ownership Interest |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership percentage | 60.00% |  |  | 79.00%
Other VIEs and Non-VIEs [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investments | $ 100 | $ 43 |  |

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