Long-Term Debt (Schedule of Long-Term Debt Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	May 16, 2022	Apr. 28, 2022	Mar. 17, 2022	Dec. 31, 2021	Sep. 15, 2021	Jun. 14, 2021	Sep. 26, 2019
Debt Instrument [Line Items]
Total PSE long-term debt	$ 6,858,160
Long Term Debt, Reconciliation, Fair Value Adjustment	(148,341)				$ (156,849)
Long-term Debt, term loan								$ 210,000
Long-term Line of Credit, Noncurrent	34,300				33,300
Unamortized discount on senior notes	(9,351)				(7,404)
Long-term Debt, Excluding Current Maturities	6,663,373				6,203,766
Current maturities of long-term debt	0				450,000
Short-term debt	$ 441,300				140,000
Working Capital Needs
Debt Instrument [Line Items]
Current borrowing capacity of line of credit		$ 800,000
Senior Secured Note | 5.625% Senior Secured Note Due 2022
Debt Instrument [Line Items]
Stated interest rate percent			5.625%
Senior Secured Note | 3.650% Senior Secured Note Due 2025 [Member]
Debt Instrument [Line Items]
Stated interest rate percent	3.65%
Total PSE long-term debt	$ 400,000				400,000
Senior Secured Note | 6.000% Senior Secured Note Due 2021
Debt Instrument [Line Items]
Stated interest rate percent							6.00%
Current maturities of long-term debt							$ 500,000
Senior Secured Note | 4.100% Senior Secured Note Due 2030
Debt Instrument [Line Items]
Stated interest rate percent	4.10%
Total PSE long-term debt	$ 650,000				650,000
Senior Secured Note | 2.379% Senior Secured Note Due 2028
Debt Instrument [Line Items]
Stated interest rate percent	2.379%						2.379%
Total PSE long-term debt	$ 500,000				500,000		$ 500,000
Long-term Debt, Term							7 years
Senior Secured Note | 4.224% Senior Secured Note Due 2032
Debt Instrument [Line Items]
Stated interest rate percent	4.224%			4.224%
Total PSE long-term debt	$ 450,000			$ 450,000	0
Subsidiaries [Member]
Debt Instrument [Line Items]
Total PSE long-term debt	4,823,860
Unamortized discount on senior notes	(37,095)				(39,141)
Long-term Debt, Excluding Current Maturities	4,786,765				4,784,719
Short-term debt	$ 357,000				140,000
Subsidiaries [Member] | Working Capital Needs
Debt Instrument [Line Items]
Current borrowing capacity of line of credit		$ 800,000
Subsidiaries [Member] | Senior Notes and First Mortgage Bonds | 7.150% Series Due 2025
Debt Instrument [Line Items]
Stated interest rate percent	7.15%
Total PSE long-term debt	$ 15,000				15,000
Subsidiaries [Member] | Senior Notes and First Mortgage Bonds | 7.200% Series Due 2025
Debt Instrument [Line Items]
Stated interest rate percent	7.20%
Total PSE long-term debt	$ 2,000				2,000
Subsidiaries [Member] | Pollution Control Bonds | 3.900% Series Due 2031
Debt Instrument [Line Items]
Stated interest rate percent	3.90%
Total PSE long-term debt	$ 138,460				138,460
Subsidiaries [Member] | Pollution Control Bonds | 4.000% Series Due 2031
Debt Instrument [Line Items]
Stated interest rate percent	4.00%
Total PSE long-term debt	$ 23,400				23,400
Subsidiaries [Member] | Senior Secured Note | 7.020% Series Due 2027
Debt Instrument [Line Items]
Stated interest rate percent	7.02%
Total PSE long-term debt	$ 300,000				300,000
Subsidiaries [Member] | Senior Secured Note | 7.000% Series Due 2029
Debt Instrument [Line Items]
Stated interest rate percent	7.00%
Total PSE long-term debt	$ 100,000				100,000
Subsidiaries [Member] | Senior Secured Note | 5.483% Series Due 2035
Debt Instrument [Line Items]
Stated interest rate percent	5.483%
Total PSE long-term debt	$ 250,000				250,000
Subsidiaries [Member] | Senior Secured Note | 6.724% Series Due 2036
Debt Instrument [Line Items]
Stated interest rate percent	6.724%
Total PSE long-term debt	$ 250,000				250,000
Subsidiaries [Member] | Senior Secured Note | 6.274% Series Due 2037
Debt Instrument [Line Items]
Stated interest rate percent	6.274%
Total PSE long-term debt	$ 300,000				300,000
Subsidiaries [Member] | Senior Secured Note | 5.757% Series Due 2039
Debt Instrument [Line Items]
Stated interest rate percent	5.757%
Total PSE long-term debt	$ 350,000				350,000
Subsidiaries [Member] | Senior Secured Note | 5.795% Series Due 2040
Debt Instrument [Line Items]
Stated interest rate percent	5.795%
Total PSE long-term debt	$ 325,000				325,000
Subsidiaries [Member] | Senior Secured Note | 5.764% Series Due 2040
Debt Instrument [Line Items]
Stated interest rate percent	5.764%
Total PSE long-term debt	$ 250,000				250,000
Subsidiaries [Member] | Senior Secured Note | 4.434% Series Due 2041
Debt Instrument [Line Items]
Stated interest rate percent	4.434%
Total PSE long-term debt	$ 250,000				250,000
Subsidiaries [Member] | Senior Secured Note | 5.638% Series Due 2041
Debt Instrument [Line Items]
Stated interest rate percent	5.638%
Total PSE long-term debt	$ 300,000				300,000
Subsidiaries [Member] | Senior Secured Note | 4.300% Series Due 2045
Debt Instrument [Line Items]
Stated interest rate percent	4.30%
Total PSE long-term debt	$ 425,000				425,000
Subsidiaries [Member] | Senior Secured Note | 4.223% Series Due 2048
Debt Instrument [Line Items]
Stated interest rate percent	4.223%
Total PSE long-term debt	$ 600,000				600,000
Subsidiaries [Member] | Senior Secured Note | 3.250% Senior Secured Note Due 2049 [Member]
Debt Instrument [Line Items]
Stated interest rate percent	3.25%
Total PSE long-term debt	$ 450,000				450,000
Subsidiaries [Member] | Senior Secured Note | 4.700% Series Due 2051
Debt Instrument [Line Items]
Stated interest rate percent	4.70%
Total PSE long-term debt	$ 45,000				45,000
Subsidiaries [Member] | Senior Secured Note | 2.893% Senior Secured Note Due 2051
Debt Instrument [Line Items]
Stated interest rate percent	2.893%					2.893%
Total PSE long-term debt	$ 450,000				$ 450,000	$ 450,000
Long-term Debt, Term						30 years