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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas) (Details) $ in Millions								3 Months Ended		4 Months Ended	9 Months Ended		12 Months Ended
	Jul. 03, 2024 USD ($)	May 17, 2024 USD ($)	Mar. 14, 2024 USD ($) numberOfCombustionTurbines MW	Jan. 04, 2024	Dec. 15, 2023	Aug. 22, 2023 USD ($)	Jan. 19, 2023	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2026 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 14, 2027 USD ($)	Dec. 14, 2026 USD ($)	Aug. 31, 2026 USD ($)	Dec. 14, 2025 USD ($)	Aug. 31, 2025 USD ($)	Dec. 14, 2024 USD ($)	Aug. 31, 2024 USD ($)
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges								$ (5)	$ 88		$ 39	$ 96
Operation, maintenance and other								1,409	1,428		4,108	4,113
Interest Expense								(872)	(774)		(2,513)	(2,221)
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges								(2)	64		32	70
Operation, maintenance and other								463	424		1,358	1,285
Interest Expense								(189)	(172)		(537)	(504)
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Proposed rate period (in years)							3 years
Requested rate increase (decrease), amount																			$ 501
Settlement rate, amount						$ 19,500
Settlement rate, period (in years)						3 years
Impairment of assets and other charges									59			59
Operation, maintenance and other									$ 8			$ 8
Approved return on equity percentage (as a percent)					10.10%
Public utilities, approved equity capital structure, percentage (as a percent)					53.00%
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount										$ 823					$ 150		$ 172
Requested rate increase (decrease) (as a percent)										15.70%
Approved rate increase (decrease), amount													$ 768	$ 158		$ 174		$ 436
2023 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Settlement rate, amount						$ 4,600
2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Proposed rate period (in years)				2 years
Settlement rate, amount	$ 7,400
Impairment of assets and other charges								33			33
Operation, maintenance and other								$ 2			2
Interest Expense											$ 11
Approved rate increase (decrease), amount	$ 150	$ 240
Approved return on equity percentage (as a percent)		9.94%
Public utilities, approved equity capital structure, percentage (as a percent)		51.21%
EDIT		$ 84
Marshall Combustion Turbines CPCN Proceedings | NCUC | Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), amount			$ 104
Requested rate increase (decrease) (as a percent)			2.20%
New combustion turbines (in megawatts) | MW			850
Hydrogen-capable CTs | numberOfCombustionTurbines			2

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
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-Name Accounting Standards Codification
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-Paragraph 2
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