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Goodwill and Intangibles (Intangible Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of Intangible Assets |  | $ 38 | $ 38
Gross |  | 542 | 533
Accumulated amortization | [1] | (118) | (80)
Intangibles, net |  | 424 | 453
Logistics and Storage [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross |  | 9 | 0
Accumulated amortization | [1] | 0 | 0
Intangibles, net |  | $ 9 | 0
Logistics and Storage [Member] | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life |  | 4 years |
Logistics and Storage [Member] | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life |  | 6 years |
Gathering and Processing [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross |  | $ 533 | 533
Accumulated amortization | [1] | (118) | (80)
Intangibles, net |  | $ 415 | $ 453
Gathering and Processing [Member] | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life |  | 11 years |
Gathering and Processing [Member] | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life |  | 25 years |
[1] | Amortization expense attributable to the G&P segment for the years ended December 31, 2018 and 2017 was $38 million in both years.

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