Recent Financing Transactions - MEC (Details) - MEC - USD ($) $ in Millions	1 Months Ended
Jan. 31, 2024	Jun. 30, 2024
First Mortgage Bonds, 5.30%, due 2055 \| Subsidiary Debt
Debt Instrument [Line Items]
Face amount	$ 600
Stated interest rate	5.30%
Proceeds allocation period	24 months
Unsecured credit facility, MidAmerican Energy, expiring June 2027 \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,500

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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