STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME - HOUSTON ELECTRIC (Parenthetical) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred loss from cash flow hedge, tax	$ 0	$ 0	$ (1)
Reclassification of net deferred losses from cash flow hedge, tax	0	4	0
Houston Electric
Deferred loss from cash flow hedge, tax	0	0	0
Reclassification of net deferred losses from cash flow hedge, tax	$ 0	$ 4	$ 0

Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e640-108580

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration