Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	$ 983	$ 970
Other noncurrent assets	4,026	3,812
Total Assets	172,383	169,587
Other current liabilities	2,259	2,471
Other, noncurrent liabilities	1,868	1,650
VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	536	523
Other noncurrent assets		61
Deferred tax asset	62
Total Assets	598	584
Other current liabilities	57	51
Other, noncurrent liabilities	54	57
Total liabilities	111	108
Net assets	487	476
Duke Energy Ohio
Variable Interest Entities [Line Items]
Other noncurrent assets	88	84
Total Assets	11,015	10,774
Other current liabilities	112	82
Other, noncurrent liabilities	100	101
Duke Energy Ohio | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	131	79
Total Assets	131	79
Net assets	131	79
Duke Energy Indiana
Variable Interest Entities [Line Items]
Other noncurrent assets	265	296
Total Assets	14,675	14,488
Other current liabilities	179	105
Other, noncurrent liabilities	75	44
Duke Energy Indiana | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	222	97
Total Assets	222	97
Net assets	222	97
Pipeline Investments | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	29	15
Other noncurrent assets		61
Deferred tax asset	62
Total Assets	91	76
Other current liabilities	53	47
Other, noncurrent liabilities	51	54
Total liabilities	104	101
Net assets	(13)	(25)
Commercial Renewables | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	507	508
Total Assets	507	508
Other current liabilities	4	4
Other, noncurrent liabilities	3	3
Total liabilities	7	7
Net assets	$ 500	$ 501