Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 5,179	$ 5,124	$ 10,788	$ 10,824
Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1,439	1,342	2,965	2,777
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	192	191	388	397
Duke Energy Carolinas | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	8	7	17	14
Duke Energy Carolinas | JDA | Duke Energy Progress
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	34	173	63	267
Related party transaction, other revenues from transactions with related party	8	12	21	38
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	4	5	9	9
Progress Energy
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2,575	2,525	5,011	4,922
Progress Energy | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	172	184	350	380
Progress Energy | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	12	11	24	22
Progress Energy | JDA | Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	8	12	21	38
Related party transaction, other revenues from transactions with related party	34	173	63	267
Progress Energy | Intercompany natural gas purchases and sales | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	18	19	37	38
Duke Energy Progress
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1,191	1,269	2,453	2,589
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	108	211	227
Duke Energy Progress | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	5	5	10	10
Duke Energy Progress | JDA | Duke Energy Carolinas
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	8	12	21	38
Related party transaction, other revenues from transactions with related party	34	173	63	267
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	18	19	37	38
Duke Energy Florida
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1,380	1,252	2,550	2,325
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	68	76	139	153
Duke Energy Florida | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	7	6	14	12
Duke Energy Ohio
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	475	457	1,036	1,050
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	76	82	149	164
Duke Energy Ohio | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2	1	3	2
Duke Energy Indiana
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	604	718	1,413	1,621
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	84	91	183	215
Duke Energy Indiana | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	2	2	4	4
Piedmont
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	209	302	578	841
Piedmont | Corporate governance and shared service expenses | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	37	37	75	72
Piedmont | Indemnification coverages | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	1	2	2	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	22	24	46	47
Piedmont | Natural gas storage and transportation costs | Related Party
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 6	$ 5	$ 12	$ 11