Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	$ 976	$ 970
Other noncurrent assets	3,995	3,812
Total Assets	171,220	169,587
Other current liabilities	2,001	2,471
Other, noncurrent liabilities	1,794	1,650
VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	533	523
Other noncurrent assets		61
Deferred tax asset	61
Total Assets	594	584
Other current liabilities	53	51
Other, noncurrent liabilities	55	57
Total liabilities	108	108
Net assets	486	476
Duke Energy Ohio
Variable Interest Entities [Line Items]
Other noncurrent assets	87	84
Total Assets	10,731	10,774
Other current liabilities	73	82
Other, noncurrent liabilities	100	101
Duke Energy Ohio | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	65	79
Total Assets	65	79
Net assets	65	79
Duke Energy Indiana
Variable Interest Entities [Line Items]
Other noncurrent assets	295	296
Total Assets	14,219	14,488
Other current liabilities	108	105
Other, noncurrent liabilities	74	44
Duke Energy Indiana | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Receivables from affiliated companies	80	97
Total Assets	80	97
Net assets	80	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	61
Total Assets	90	76
Other current liabilities	50	47
Other, noncurrent liabilities	52	54
Total liabilities	102	101
Net assets	(12)	(25)
Commercial Renewables | VIE not primary beneficiary
Variable Interest Entities [Line Items]
Investments in equity method unconsolidated affiliates	504	508
Total Assets	504	508
Other current liabilities	3	4
Other, noncurrent liabilities	3	3
Total liabilities	6	7
Net assets	$ 498	$ 501