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

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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Recent Financing Transactions - PAC (Details) - PAC - USD ($) $ in Millions	Nov. 05, 2021	Oct. 31, 2021	Jul. 31, 2021	Jun. 30, 2021
Subsequent Event
Debt Instrument [Line Items]
Dividends payable		$ 150
First Mortgage Bonds, 2.95%, Due February 2022 \| Subsidiary Debt \| Subsequent Event
Debt Instrument [Line Items]
Face amount	$ 450
Stated interest rate	2.95%
First Mortgage Bonds, 2.90%, Due 2052 \| Subsidiary Debt
Debt Instrument [Line Items]
Face amount			$ 1,000
Stated interest rate			2.90%
Unsecured credit facility, $600 million, expiring June 2022, first facility, extended \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 600
Unsecured credit facility, $600 million, expiring June 2022, second facility, extended \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity				600
Unsecured Credit Facility, $1.2 Billion, Expiring June 2024, Second Facility, Extended \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 1,200