Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	$ 951	$ 970
Other noncurrent assets	4,050	3,812
Total Assets	176,340	169,587
Other current liabilities	2,204	2,471
Other, noncurrent liabilities	1,936	1,650
VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	539	523
Other noncurrent assets	60	61
Total Assets	599	584
Other current liabilities	58	51
Other, noncurrent liabilities	51	57
Total liabilities	109	108
Net assets	490	476
Duke Energy Ohio
Variable Interest Entities [Line Items]
Other noncurrent assets	91	84
Total Assets	11,315	10,774
Other current liabilities	86	82
Other, noncurrent liabilities	97	101
Duke Energy Ohio | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	178	79
Total Assets	178	79
Net assets	178	79
Duke Energy Indiana
Variable Interest Entities [Line Items]
Other noncurrent assets	275	296
Total Assets	14,816	14,488
Other current liabilities	178	105
Other, noncurrent liabilities	59	44
Duke Energy Indiana | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	263	97
Total Assets	263	97
Net assets	263	97
Pipeline Investments | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	34	15
Other noncurrent assets	60	61
Total Assets	94	76
Other current liabilities	56	47
Other, noncurrent liabilities	49	54
Total liabilities	105	101
Net assets	(11)	(25)
Commercial Renewables | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	505	508
Total Assets	505	508
Other current liabilities	2	4
Other, noncurrent liabilities	2	3
Total liabilities	4	7
Net assets	$ 501	$ 501