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Regulatory Matters (Regulatory Matters Narrative - Duke Energy Carolinas) (Details) - USD ($) $ in Millions				1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 15, 2023	Jan. 19, 2023	Jun. 07, 2021	Aug. 31, 2023	Mar. 31, 2025	Mar. 31, 2024	Dec. 14, 2027	Dec. 14, 2026	Dec. 14, 2025	Dec. 14, 2024
Public Utilities, General Disclosures [Line Items]
Operation, maintenance and other					$ 1,499	$ 1,380
Interest Expense					(889)	(817)
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Operation, maintenance and other					484	452
Interest Expense					$ (200)	$ (180)
Nuclear Regulatory Commission
Public Utilities, General Disclosures [Line Items]
Operating license extension (in years)					20 years
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Proposed rate period (in years)		3 years
Settlement rate, amount				$ 19,500
Settlement rate, period (in years)				3 years
Approved rate increase (decrease), amount										$ 436
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]
Approved rate increase (decrease), amount							$ 768	$ 158	$ 174
2023 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Settlement rate, amount				$ 4,600
Oconee Nuclear Station Subsequent License Renewal | Nuclear Regulatory Commission | Duke Energy Carolinas | Oconee Nuclear Station
Public Utilities, General Disclosures [Line Items]
Operating license extension (in years)			20 years

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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
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03)
-Publisher FASB
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