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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2025	Dec. 31, 2024
Goodwill [Line Items]
Goodwill		$ 19,010,000,000	$ 19,010,000,000
Goodwill accumulated impairment loss		0	0
Goodwill reclassified to non-current assets held for sale	$ 294,000,000
Impairment charges		0
Discontinued Operations, Held-for-sale
Goodwill [Line Items]
Goodwill		294,000,000	294,000,000
Discontinued Operations, Held-for-sale \| Piedmont Tennessee Disposal Group
Goodwill [Line Items]
Goodwill	294,000,000	294,000,000	294,000,000
Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill		17,400,000,000	17,400,000,000
Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill		1,600,000,000	1,600,000,000
Duke Energy Ohio
Goodwill [Line Items]
Goodwill		920,000,000	920,000,000
Goodwill accumulated impairment loss		216,000,000	216,000,000
Duke Energy Ohio \| Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill		596,000,000	596,000,000
Duke Energy Ohio \| Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill		324,000,000	324,000,000
Progress Energy
Goodwill [Line Items]
Goodwill		3,655,000,000	3,655,000,000
Progress Energy \| Electric Utilities and Infrastructure
Goodwill [Line Items]
Goodwill accumulated impairment loss		0
Piedmont
Goodwill [Line Items]
Goodwill		39,000,000	39,000,000
Goodwill reclassified to non-current assets held for sale	$ 10,000,000
Piedmont \| Discontinued Operations, Held-for-sale \| Piedmont Tennessee Disposal Group
Goodwill [Line Items]
Goodwill		10,000,000	$ 10,000,000
Piedmont \| Gas Utilities and Infrastructure
Goodwill [Line Items]
Goodwill accumulated impairment loss		$ 0