FINANCING ACTIVITIES - Schedule of Long-Term Debt Information (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total Long-term Debt Outstanding	$ 46,137.6	$ 42,642.8
Long-term Debt Due Within One Year	1,898.6	3,335.0
Long-term Debt	44,239.0	39,307.8
Trust fund assets one time fee obligation for nuclear fuel disposition	381.0	367.0
Senior Unsecured Notes
Debt Instrument [Line Items]
Senior Unsecured Notes	37,865.2	36,410.9
Pollution Control Bonds
Debt Instrument [Line Items]
Pollution Control Bonds	1,685.7	1,771.3
Notes Payable
Debt Instrument [Line Items]
Notes Payable	614.8	609.9
Securitization Bonds
Debt Instrument [Line Items]
Securitization Bonds	983.3	578.0
Spent Nuclear Fuel Obligation
Debt Instrument [Line Items]
Spent Nuclear Fuel Obligation	326.7	316.3
Junior Subordinated Notes
Debt Instrument [Line Items]
Junior Subordinated Notes	3,707.9	2,579.1
Other Long-term Debt
Debt Instrument [Line Items]
Other Long-term Debt	$ 954.0	$ 377.3

Trust fund assets one time fee obligation for nuclear fuel disposition.

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