Regulatory Matters - PacifiCorp - Regulatory Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Regulatory Assets [Line Items]
Regulatory assets		$ 115	$ 171
Regulatory assets, noncurrent		2,766	2,896
Total regulatory assets		2,881	3,067
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		1,400	1,300
Deferred Income Tax Charge [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[1]	$ 223	196
Regulatory asset amortization period years	[1]	Various
Employee benefit plans [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[2]	$ 667	773
Regulatory asset amortization period years	[2]	15.2053973013493
Unamortized contract values [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 60	79
Regulatory asset amortization period years		4
Deferred net power costs [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 110	103
Regulatory asset amortization period years		1.92727272727273
Unrealized loss on regulated derivative contracts [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 78	120
Regulatory asset amortization period years		2.58974358974359
Asset retirement obligations
Regulatory Assets [Line Items]
Total regulatory assets		$ 445	375
Regulatory asset amortization period years		Various
PacifiCorp [Member]
Regulatory Assets [Line Items]
Regulatory assets		$ 63	36
Regulatory assets, noncurrent		1,060	1,076
Total regulatory assets		1,123	1,112
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		609	636
PacifiCorp [Member] | Employee benefit plans [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[3]	$ 422	448
Regulatory asset amortization period years	[3]	19 years
PacifiCorp [Member] | Utah mine disposition [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[4]	$ 125	136
Regulatory asset amortization period years	[4]	Various
PacifiCorp [Member] | Unamortized contract values [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 60	79
Regulatory asset amortization period years		4 years
PacifiCorp [Member] | Deferred net power costs [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 106	62
Regulatory asset amortization period years		2 years
PacifiCorp [Member] | Unrealized loss on regulated derivative contracts [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 62	96
Regulatory asset amortization period years		3 years
PacifiCorp [Member] | Asset retirement obligations
Regulatory Assets [Line Items]
Total regulatory assets		$ 140	119
Regulatory asset amortization period years		28 years
PacifiCorp [Member] | Other
Regulatory Assets [Line Items]
Total regulatory assets		$ 208	$ 172
Regulatory asset amortization period years		Various

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

[4] (2)Amounts represent regulatory assets established as a result of the Utah mine disposition in 2015 for the net property, plant and equipment not considered probable of disallowance and for the portion of losses associated with the assets held for sale, UMWA 1974 Pension Plan withdrawal and closure costs incurred to date considered probable of recovery.