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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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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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