Regulatory Matters - PacifiCorp - Regulatory Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019
Regulatory Assets [Line Items]
Regulatory Assets, Current		$ 283		$ 115
Regulatory assets, noncurrent		3,157		2,766
Regulatory Assets		3,440		2,881
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		1,600		1,400
Deferred Income Tax Charge [Member]
Regulatory Assets [Line Items]
Regulatory Assets		283	[1]	223
Employee benefit plans [Member]
Regulatory Assets [Line Items]
Regulatory Assets	[2]	$ 722		667
Regulatory asset amortization period years		15
Deferred net power costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		$ 139		110
Regulatory asset amortization period years		1 year
Asset Retirement Obligation Costs
Regulatory Assets [Line Items]
Regulatory Assets		$ 640		445
Regulatory asset amortization period years		13 years
us-gaap_demandsidemanagement
Regulatory Assets [Line Items]
Regulatory Assets		$ 197		9
Regulatory asset amortization period years		10 years
PacifiCorp [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Current		$ 116		63
Regulatory assets, noncurrent		1,279		1,060
Regulatory Assets		1,395		1,123
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		707		609
PacifiCorp [Member] | DSM Regulatory Assets
Regulatory Assets [Line Items]
Amounts Billed to Customers, Used to Accelerate Depreciation		185
PacifiCorp [Member] | Employee benefit plans [Member]
Regulatory Assets [Line Items]
Regulatory Assets	[3]	$ 432		422
Regulatory asset amortization period years	[3]	20 years
PacifiCorp [Member] | Utah mine disposition [Member]
Regulatory Assets [Line Items]
Regulatory Assets	[4]	$ 117		125
Regulatory asset amortization period years	[4]	Various
PacifiCorp [Member] | Unamortized contract values [Member]
Regulatory Assets [Line Items]
Regulatory Assets		$ 42		60
Regulatory asset amortization period years		3 years
PacifiCorp [Member] | Deferred net power costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets		$ 78		106
Regulatory asset amortization period years		1 year
PacifiCorp [Member] | Unrealized loss on regulated derivative contracts [Member]
Regulatory Assets [Line Items]
Regulatory Assets		$ 17		62
Regulatory asset amortization period years		2 years
PacifiCorp [Member] | Asset Retirement Obligation Costs
Regulatory Assets [Line Items]
Regulatory Assets		$ 252		140
Regulatory asset amortization period years		24 years
PacifiCorp [Member] | Other
Regulatory Assets [Line Items]
Regulatory Assets		$ 261		200
Regulatory asset amortization period years		Various
PacifiCorp [Member] | us-gaap_demandsidemanagement
Regulatory Assets [Line Items]
Regulatory Assets	[5]	$ 196		$ 8
Regulatory asset amortization period years		10 years

[1] Amounts primarily represent income tax benefits related to certain property-related basis differences and other various differences that were previously passed on to customers and will be included in regulated rates when the temporary differences reverse.

[2] Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.

[3] Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in rates when recognized.

[4] Amounts represent regulatory assets established as a result of the Utah mine disposition in 2015 for the United Mine Workers of America ("UMWA") 1974 Pension Plan withdrawal and closure costs incurred to date considered probable of recovery. (3)At December 31, 2019, DSM regulatory assets were substantially offset by amounts billed to Utah retail customers under the related Utah STEP program. In accordance with the Utah general rate case order issued in December 2020, $185 million of amounts billed to Utah customers under the Utah STEP program were used to accelerate depreciation of certain coal-fueled generation units as discussed in Note 3.

[5] At December 31, 2019, DSM regulatory assets were substantially offset by amounts billed to Utah retail customers under the related Utah STEP program. In accordance with the Utah general rate case order issued in December 2020, $185 million of amounts billed to Utah customers under the Utah STEP program were used to accelerate depreciation of certain coal-fueled generation units as discussed in Note 3.