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Goodwill and Intangibles (Reconciliation of Goodwill) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |  |
Gross goodwill | $ 2,716,000,000 |  | $ 2,375,000,000
Accumulated impairment losses | (130,000,000) |  | (130,000,000)
Goodwill, beginning balance | 2,245,000,000 | $ 2,245,000,000 |
Impairment losses | 0 | 0 |
Acquisitions | 341,000,000 | 0 |
Goodwill, ending balance | 2,586,000,000 | 2,245,000,000 |
Logistics and Storage [Member] |  |  |
Goodwill [Line Items] |  |  |
Gross goodwill | 503,000,000 |  | 162,000,000
Accumulated impairment losses | 0 |  | 0
Goodwill, beginning balance | 162,000,000 | 162,000,000 |
Impairment losses | 0 | 0 |
Acquisitions | 341,000,000 | 0 |
Goodwill, ending balance | 503,000,000 | 162,000,000 |
Gathering and Processing [Member] |  |  |
Goodwill [Line Items] |  |  |
Gross goodwill | 2,213,000,000 |  | 2,213,000,000
Accumulated impairment losses | (130,000,000) |  | $ (130,000,000)
Goodwill, beginning balance | 2,083,000,000 | 2,083,000,000 |
Impairment losses | 0 | 0 |
Acquisitions | 0 | 0 |
Goodwill, ending balance | $ 2,083,000,000 | $ 2,083,000,000 |

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