Recent Financing Transactions Recent Financings Transactions - Credit Facilities (Details) - Line of Credit [Member] $ in Millions, $ in Millions	May 31, 2020 USD ($)	Apr. 30, 2020 CAD ($)
AltaLink, L.P. [Member] | Revolving credit facility, C$100 million, expiring April 2021 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 100
Debt To Capitalization Ratio		0.75
AltaLink Investments, L.P. [Member] | Revolving term credit facility, C$200 million, expiring April 2021 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 200
Debt To Capitalization Ratio		0.80
MidAmerican Energy Company [Member] | Unsecured credit facility, $400 million, expiring August 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400
MidAmerican Energy Company [Member] | Unsecured credit facility, $600 million, expiring May 2021 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 600
Debt To Capitalization Ratio	0.65