Regulatory Matters (Duke Energy Carolinas Narrative) (Details) - USD ($) $ in Millions				11 Months Ended	12 Months Ended										24 Months Ended
	Jan. 04, 2024	Dec. 15, 2023	Aug. 22, 2023	Dec. 31, 2026	Dec. 14, 2027	Dec. 14, 2026	Jan. 18, 2026	Dec. 14, 2025	Jan. 18, 2025	Dec. 14, 2024	Jan. 18, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 03, 2028	Jan. 03, 2026
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges												$ 85	$ 434	$ 353
Operation, maintenance and other												5,625	5,734	5,703
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges												44	26	227
Operation, maintenance and other												1,774	$ 1,892	$ 1,833
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
MYRP period (in years)			3 years
Settlement amount			$ 19,500
Impairment of assets and other charges												29
Operation, maintenance and other												$ 8
Approved return on equity (as a percent)		10.10%
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Equity
Public Utilities, General Disclosures [Line Items]
Approved return on equity (as a percent)		53.00%
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Debt
Public Utilities, General Disclosures [Line Items]
Approved return on equity (as a percent)		47.00%
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)				$ 823			$ 150		$ 172
Requested return on equity (as a percent)				15.70%
Approved rate increase (decrease) amount by state commission					$ 768	$ 158		$ 174
2023 North Carolina Rate Case | NCUC | Duke Energy Carolinas | Forecast | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)											$ 501
Approved rate increase (decrease) amount by state commission										$ 436
2023 North Carolina Rate Case, Retail Allocated | NCUC | Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Settlement amount			$ 4,600
2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)	$ 323
Requested rate increase (decrease), percent	15.50%
2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas | Forecast
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), net of tax (as a percent)															4.10%
Requested rate increase (decrease), amended, amount															$ 84
2024 South Carolina Rate Case | PSCSC | Duke Energy Carolinas | Forecast | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease), net of tax (as a percent)																11.40%
Requested rate increase (decrease), amended, amount																$ 239