Short-Term Debt and Credit Facilities - PacifiCorp - Credit Facility (Details) $ in Millions		Dec. 31, 2017 USD ($)		Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 9,051		$ 6,345
Short-term Debt	[1]	(4,488)		(1,869)
Line of Credit Facility, Amounts Supported	[1]	(594)		(457)
Line of Credit Facility, Remaining Borrowing Capacity	[1]	3,969		4,019
PacifiCorp [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,000	[2]	1,000
Short-term Debt		(80)		(270)
Line of Credit Facility, Amounts Supported		(130)		(142)
Line of Credit Facility, Remaining Borrowing Capacity		$ 790		$ 588
PacifiCorp [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate		1.83%		0.96%
Debt to capitalization ratio		0.65
PacifiCorp [Member] | Commercial Paper [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate		1.83%		0.96%
PacifiCorp [Member] | Unsecured credit facility, $600 million, expiring June 2017 [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 March 2018 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		400
PacifiCorp [Member] | Certain transactions required by third parties [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amounts Supported		(14)
PacifiCorp [Member] | Tax exempt bond obligations and commodity contract collateral requirement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amounts Supported		(216)		$ (255)
Letters of Credit Outstanding, Amount		$ 230		$ 269

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

[2] (2)Includes amounts borrowed on a short-term loan totaling $600 million at BHE that was repaid in full in January 2018.