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Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 6,017	$ 5,891	$ 17,208	$ 16,679
Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1,943	1,675	5,498	4,640
Duke Energy Carolinas | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	186	198	589	586
Duke Energy Carolinas | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	11	9	33	26
Duke Energy Carolinas | JDA | Duke Energy Progress
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	48	58	141	121
Related party transaction, other revenues from transactions with related party	7	5	29	26
Duke Energy Carolinas | Intercompany natural gas purchases and sales | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	5	5	14	14
Progress Energy
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2,844	3,038	7,893	8,049
Progress Energy | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	165	172	524	522
Progress Energy | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	13	11	42	35
Progress Energy | JDA | Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	7	5	29	26
Related party transaction, other revenues from transactions with related party	48	58	141	121
Progress Energy | Intercompany natural gas purchases and sales | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	19	19	56	56
Duke Energy Progress
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1,449	1,392	4,122	3,845
Duke Energy Progress | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	104	103	318	314
Duke Energy Progress | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	5	5	17	15
Duke Energy Progress | JDA | Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	7	5	29	26
Related party transaction, other revenues from transactions with related party	48	58	141	121
Duke Energy Progress | Intercompany natural gas purchases and sales | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	19	19	56	56
Duke Energy Florida
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1,390	1,642	3,758	4,192
Duke Energy Florida | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	61	69	206	208
Duke Energy Florida | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	8	6	25	20
Duke Energy Ohio
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	496	449	1,494	1,485
Duke Energy Ohio | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	74	73	228	222
Duke Energy Ohio | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2	1	5	4
Duke Energy Indiana
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	609	633	1,815	2,046
Duke Energy Indiana | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	98	92	283	275
Duke Energy Indiana | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2	2	7	6
Piedmont
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	220	203	785	781
Piedmont | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	40	32	121	107
Piedmont | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1	1	3	3
Piedmont | Intercompany natural gas purchases and sales | Related Party
Related Party Transaction [Line Items]
Related party transaction, other revenues from transactions with related party	24	24	70	70
Piedmont | Natural gas storage and transportation costs | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 5	$ 6	$ 17	$ 18

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