Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Receivables from affiliated companies	$ 1,112	$ 1,309
Investments in equity method unconsolidated affiliates	492	455
Other noncurrent assets	3,964	3,400
Total Assets	176,893	178,086	$ 169,587
Other current liabilities	2,319	2,167
Other noncurrent liabilities	1,393	1,502
Duke Energy Ohio
Variable Interest Entity [Line Items]
Receivables from affiliated companies	112	73
Other noncurrent assets	84	71
Total Assets	12,216	11,506	$ 10,774
Other current liabilities	65	74
Other noncurrent liabilities	86	96
Duke Energy Ohio | Affiliated entity
Variable Interest Entity [Line Items]
Receivables from affiliated companies	239	247
Duke Energy Indiana
Variable Interest Entity [Line Items]
Receivables from affiliated companies	156	112
Other noncurrent assets	325	254
Total Assets	14,811	14,654
Other current liabilities	184	161
Other noncurrent liabilities		65
Duke Energy Indiana | Affiliated entity
Variable Interest Entity [Line Items]
Receivables from affiliated companies	197	298
Non-consolidated VIEs | Duke Energy Ohio
Variable Interest Entity [Line Items]
Total Assets	150	198
Net assets	150	198
Non-consolidated VIEs | Duke Energy Ohio | Affiliated entity
Variable Interest Entity [Line Items]
Receivables from affiliated companies	150	198
Non-consolidated VIEs | Duke Energy Indiana
Variable Interest Entity [Line Items]
Total Assets	208	317
Net assets	208	317
Non-consolidated VIEs | Duke Energy Indiana | Affiliated entity
Variable Interest Entity [Line Items]
Receivables from affiliated companies	208	317
Non-consolidated VIEs | Pipeline Investments
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	67	43
Other noncurrent assets	43	45
Total Assets	110	88
Other current liabilities	4	59
Other noncurrent liabilities	5	47
Total liabilities	9	106
Net assets	$ 101	$ (18)