Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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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Recent Financing Transactions - MEC (Details) - MEC - USD ($) $ in Millions	Jul. 31, 2021	Jun. 30, 2021
MEC First Mortgage Bonds, 2.70%, Due August 2052 \| Subsequent Event \| Subsidiary Debt
Debt Instrument [Line Items]
Face amount	$ 500
Stated interest rate	2.70%
Line of Credit \| Unsecured credit facility, $900 million, expiring June 2022
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 900
Line of Credit \| Unsecured Credit Facility, $1.5 Billion, Expiring June 2024
Debt Instrument [Line Items]
Maximum borrowing capacity		1,500
Line of Credit \| Unsecured credit facility, $600 million, expiring August 2021
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 600