Short-Term Debt and Credit Facilities - PacifiCorp - Credit Facility (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 11,030	$ 9,412
Short-term Debt	[1]	(2,286)	(3,214)
Line of Credit Facility, Amounts Supported	[1]	(590)	(629)
Line of Credit Facility, Remaining Borrowing Capacity	[1]	8,154	5,569
PacifiCorp [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,200	1,200
Short-term Debt		(93)	(130)
Line of Credit Facility, Amounts Supported		(218)	(256)
Line of Credit Facility, Remaining Borrowing Capacity		$ 889	$ 814
PacifiCorp [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate		0.16%	2.05%
Debt To Capitalization Ratio		0.65
PacifiCorp [Member] | Commercial Paper [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate		0.16%	2.05%
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring June 2022, first facility, extended [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 600
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring June 2022, second facility, extended [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		600
PacifiCorp [Member] | Certain transactions required by third parties [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amounts Supported		(11)	$ (13)
PacifiCorp [Member] | Tax exempt bond obligations and commodity contract collateral requirement [Member]
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount		$ 11	$ 13
Minimum [Member] | PacifiCorp [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt To Capitalization Ratio		0.65
Maximum [Member] | PacifiCorp [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt To Capitalization Ratio		1.0

[1] The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.