Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	$ 465	$ 455
Other noncurrent assets	3,426	3,400
Total Assets	178,833	178,086
Other current liabilities	1,970	2,167
Other	1,417	1,502
Duke Energy Ohio
Variable Interest Entities [Line Items]
Other noncurrent assets	74	71
Total Assets	11,693	11,506
Other current liabilities	66	74
Other	95	96
Duke Energy Ohio | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	164	198
Total Assets	164	198
Net assets	164	198
Duke Energy Indiana
Variable Interest Entities [Line Items]
Other noncurrent assets	265	254
Total Assets	14,419	14,654
Other current liabilities	145	161
Other	31	65
Duke Energy Indiana | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	221	317
Total Assets	221	317
Net assets	221	317
Pipeline Investments | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	49	43
Other noncurrent assets	46	45
Total Assets	95	88
Other current liabilities	52	59
Other	49	47
Total liabilities	101	106
Net assets	$ (6)	$ (18)