SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY - FINANCING ACTIVITIES - SCHEDULE OF LONG-TERM DEBT (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total Long-term Debt Outstanding	$ 47,322	$ 42,643
Long-term Debt Due Within One Year	3,194	3,335
Long-term Debt	$ 44,128	39,308
Senior Unsecured Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.45%
Senior Unsecured Notes	$ 37,190	$ 36,411
Senior Unsecured Notes | Minimum
Debt Instrument [Line Items]
Interest Rate	1.63%	1.00%
Senior Unsecured Notes | Maximum
Debt Instrument [Line Items]
Interest Rate	8.13%	8.13%
Pollution Control Bonds
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.62%
Pollution Control Bonds	$ 1,637	$ 1,771
Pollution Control Bonds | Minimum
Debt Instrument [Line Items]
Interest Rate	2.40%	0.63%
Pollution Control Bonds | Maximum
Debt Instrument [Line Items]
Interest Rate	4.70%	4.70%
Junior Subordinated Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.83%
Junior Subordinated Notes	$ 4,681	$ 2,579
Junior Subordinated Notes | Minimum
Debt Instrument [Line Items]
Interest Rate	3.88%	3.88%
Junior Subordinated Notes | Maximum
Debt Instrument [Line Items]
Interest Rate	7.05%	7.05%
Parent Company
Debt Instrument [Line Items]
Senior Unsecured Notes	$ 4,882	$ 5,290
Pollution Control Bonds	537	537
Junior Subordinated Notes	4,681	2,579
Total Long-term Debt Outstanding	10,100	8,406
Long-term Debt Due Within One Year	50	1,282
Long-term Debt	$ 10,050	$ 7,124
Parent Company | Senior Unsecured Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.58%
Parent Company | Senior Unsecured Notes | Minimum
Debt Instrument [Line Items]
Interest Rate	1.80%	1.00%
Parent Company | Senior Unsecured Notes | Maximum
Debt Instrument [Line Items]
Interest Rate	5.95%	5.95%
Parent Company | Pollution Control Bonds
Debt Instrument [Line Items]
Weighted Average Interest Rate	3.12%
Parent Company | Pollution Control Bonds | Minimum
Debt Instrument [Line Items]
Interest Rate	2.40%	2.40%
Parent Company | Pollution Control Bonds | Maximum
Debt Instrument [Line Items]
Interest Rate	3.75%	3.75%
Parent Company | Junior Subordinated Notes
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.83%
Parent Company | Junior Subordinated Notes | Minimum
Debt Instrument [Line Items]
Interest Rate	3.88%	3.88%
Parent Company | Junior Subordinated Notes | Maximum
Debt Instrument [Line Items]
Interest Rate	7.05%	7.05%