Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 6,837	$ 5,912
Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2,176	1,821
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	175	178
Duke Energy Carolinas \| Indemnification coverages \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	12	13
Duke Energy Carolinas \| JDA \| Duke Energy Progress
Related Party Transaction [Line Items]
Related party transaction, other revenues from transactions with related party	179	82
Related party transaction, expenses from transactions with related party	166	116
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	2
Progress Energy
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	3,010	2,597
Progress Energy \| Corporate governance and shared service expenses \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	159	150
Progress Energy \| Indemnification coverages \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	19	16
Progress Energy \| JDA \| Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, other revenues from transactions with related party	166	116
Related party transaction, expenses from transactions with related party	179	82
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
Duke Energy Progress
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1,816	1,540
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	92	86
Duke Energy Progress \| Indemnification coverages \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	8	7
Duke Energy Progress \| JDA \| Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, other revenues from transactions with related party	166	116
Related party transaction, expenses from transactions with related party	179	82
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
Duke Energy Florida
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1,191	1,053
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	67	64
Duke Energy Florida \| Indemnification coverages \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	11	9
Duke Energy Ohio
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	671	602
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	71	64
Duke Energy Ohio \| Indemnification coverages \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1	1
Duke Energy Indiana
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	784	665
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	91	71
Duke Energy Indiana \| Indemnification coverages \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	3	2
Piedmont
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	599	456
Piedmont \| Corporate governance and shared service expenses \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	32	31
Piedmont \| Indemnification coverages \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1	1
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	21
Piedmont \| Natural gas storage and transportation costs \| Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 5	$ 5

Related Party Transaction [Line Items]