Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 5,692	$ 5,471	$ 11,604	$ 11,191
Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1,637	1,752	3,458	3,555
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	157	189	335	403
Duke Energy Carolinas \| Indemnification coverages \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	14	11	27	22
Duke Energy Carolinas \| JDA \| Duke Energy Progress
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	71	53	187	93
Related party transaction, other revenues from transactions with related party	8	6	90	22
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	2	5	4	9
Progress Energy
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2,652	2,533	5,249	5,049
Progress Energy \| Corporate governance and shared service expenses \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	141	171	291	359
Progress Energy \| Indemnification coverages \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	16	15	32	29
Progress Energy \| JDA \| Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	8	6	90	22
Related party transaction, other revenues from transactions with related party	71	53	187	93
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	18	38	37
Duke Energy Progress
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1,278	1,288	2,818	2,673
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	81	100	167	214
Duke Energy Progress \| Indemnification coverages \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	6	6	13	12
Duke Energy Progress \| JDA \| Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	8	6	90	22
Related party transaction, other revenues from transactions with related party	71	53	187	93
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	18	38	37
Duke Energy Florida
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1,371	1,240	2,424	2,368
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	60	71	124	145
Duke Energy Florida \| Indemnification coverages \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	10	9	19	17
Duke Energy Ohio
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	533	472	1,135	998
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	70	77	134	154
Duke Energy Ohio \| Indemnification coverages \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2	1	3	3
Duke Energy Indiana
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	650	572	1,315	1,206
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	73	83	144	185
Duke Energy Indiana \| Indemnification coverages \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	3	3	5	5
Piedmont
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	317	223	773	565
Piedmont \| Corporate governance and shared service expenses \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	36	40	67	81
Piedmont \| Indemnification coverages \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2	1	3	2
Piedmont \| Intercompany natural gas purchases and sales \| Related Party
Related Party Transaction [Line Items]
Related party transaction, other revenues from transactions with related party	21	23	42	46
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	$ 11	$ 12