Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The charge against earnings resulting from the aggregate write down of tangible assets from their carrying value to their fair value.

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ESTIMATES, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND BALANCE SHEET DETAIL Estimates, Significant Accounting Policies and Balance Sheet Detail - goodwill (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Goodwill		$ 0	$ 12
Southwest Gas [Member]
Goodwill, Impairment Loss		$ (12)
Trunkline [Member]
Goodwill, Impairment Loss	$ (262)
Sea Robin [Member]
Tangible Asset Impairment Charges	$ 127