Recent Financing Transactions - PAC (Details) - PAC - USD ($) $ in Millions	1 Months Ended
	Jun. 30, 2023	Jan. 31, 2023	May 31, 2023
Debt Instrument [Line Items]
Common stock dividend declared		$ 300
First Mortgage Bonds, 5.50%, due May 2054 | Subsidiary Debt
Debt Instrument [Line Items]
Face amount			$ 1,200
Stated interest rate			5.50%
Unsecured credit facility, expiring June 2026 | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 2,000		$ 1,200
Unsecured credit facility, expiring January 2024 | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 800
Debt term	364 days