Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Variable Interest Entities [Line Items]
Receivables from affiliated companies	$ 3,244	$ 3,106
Investments in equity method unconsolidated affiliates	505	455
Other noncurrent assets	3,698	3,400
Total Assets	181,160	178,086
Other current liabilities	2,087	2,167
Other (includes $54 at 2023 related to VIEs)	1,325	1,502
Duke Energy Ohio
Variable Interest Entities [Line Items]
Receivables from affiliated companies	97	73
Other noncurrent assets	76	71
Total Assets	11,794	11,506
Other current liabilities	72	74
Other (includes $54 at 2023 related to VIEs)	90	96
Duke Energy Ohio | Affiliated Entity
Variable Interest Entities [Line Items]
Receivables from affiliated companies	155	247
Duke Energy Ohio | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Total Assets	122	198
Net assets	122	198
Duke Energy Ohio | VIE not primary beneficiary | Affiliated Entity
Variable Interest Entities [Line Items]
Receivables from affiliated companies	122	198
Duke Energy Indiana
Variable Interest Entities [Line Items]
Receivables from affiliated companies	117	112
Other noncurrent assets	323	254
Total Assets	14,585	14,654
Other current liabilities	157	161
Other (includes $54 at 2023 related to VIEs)	14	65
Duke Energy Indiana | Affiliated Entity
Variable Interest Entities [Line Items]
Receivables from affiliated companies	154	298
Duke Energy Indiana | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Total Assets	161	317
Net assets	161	317
Duke Energy Indiana | VIE not primary beneficiary | Affiliated Entity
Variable Interest Entities [Line Items]
Receivables from affiliated companies	161	317
Pipeline Investments | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	61	43
Other noncurrent assets	43	45
Total Assets	104	88
Other current liabilities	18	59
Other (includes $54 at 2023 related to VIEs)	12	47
Total liabilities	30	106
Net assets	$ 74	$ (18)