Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrecognized amounts on retirement benefits, net of tax	$ (19)	$ (15)	$ 8
Unrealized gains on marketable securities, net of tax of $-, $- and $-	(3)	(8)	1
PacifiCorp [Member]
Unrecognized amounts on retirement benefits, net of tax	(1)	(1)	1
Eastern Energy Gas Holdings, LLC [Member]
Unrecognized amounts on retirement benefits, net of tax	40	15	(18)
Unrealized gains (losses) on cash flow hedges, net of tax	$ (10)	$ 20
Unrealized gains on marketable securities, net of tax of $-, $- and $-			$ (2)

Amount, after 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
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Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

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