Variable Interest Entities (Schedule of Consolidated VIEs) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Variable Interest Entities [Line Items]
Regulatory Assets: Current	$ 2,834	$ 2,150
Current Assets: Other	1,163	638
Other Noncurrent Assets: Regulatory assets	12,863	12,487
Property, Plant and Equipment: Cost	166,004	161,819
Accumulated depreciation and amortization	(52,252)	(50,555)
Other Noncurrent Assets: Other	4,026	3,812
Current Liabilities: Other	2,259	2,471
Current maturities of long-term debt	3,171	3,387
Long-Term Debt	63,147	60,448
Other Noncurrent Liabilities: AROs	12,080	12,129
Other Noncurrent Liabilities: Other	1,868	1,650
Duke Energy Florida
Variable Interest Entities [Line Items]
Regulatory Assets: Current	785	497
Current Assets: Other	58	80
Other Noncurrent Assets: Regulatory assets	1,920	1,791
Property, Plant and Equipment: Cost	24,714	23,865
Accumulated depreciation and amortization	(6,097)	(5,819)
Other Noncurrent Assets: Other	407	399
Current Liabilities: Other	394	408
Current maturities of long-term debt	327	76
Long-Term Debt	8,120	8,406
Other Noncurrent Liabilities: AROs	392	436
Other Noncurrent Liabilities: Other	333	309
Duke Energy Carolinas
Variable Interest Entities [Line Items]
Regulatory Assets: Current	757	544
Current Assets: Other	128	95
Other Noncurrent Assets: Regulatory assets	3,339	2,935
Property, Plant and Equipment: Cost	53,074	51,874
Accumulated depreciation and amortization	(18,205)	(17,854)
Other Noncurrent Assets: Other	1,305	1,248
Current Liabilities: Other	470	546
Current maturities of long-term debt	1,018	362
Long-Term Debt	12,844	12,595
Other Noncurrent Liabilities: AROs	5,065	5,052
Other Noncurrent Liabilities: Other	558	536
Duke Energy Progress
Variable Interest Entities [Line Items]
Regulatory Assets: Current	621	533
Current Assets: Other	123	83
Other Noncurrent Assets: Regulatory assets	4,161	4,118
Property, Plant and Equipment: Cost	37,885	37,018
Accumulated depreciation and amortization	(13,977)	(13,387)
Other Noncurrent Assets: Other	787	792
Current Liabilities: Other	425	448
Current maturities of long-term debt	66	556
Long-Term Debt	10,446	9,543
Other Noncurrent Liabilities: AROs	5,414	5,401
Other Noncurrent Liabilities: Other	100	87
DEFPF | Duke Energy Florida | VIE primary beneficiary
Variable Interest Entities [Line Items]
Receivables of VIEs	7	5
Regulatory Assets: Current	54	54
Current Assets: Other	33	39
Other Noncurrent Assets: Regulatory assets	859	883
Current Liabilities: Other	9	9
Current maturities of long-term debt	56	56
Long-Term Debt	916	946
DECNCSF | Duke Energy Carolinas | VIE primary beneficiary
Variable Interest Entities [Line Items]
Regulatory Assets: Current	12	12
Current Assets: Other	8
Other Noncurrent Assets: Regulatory assets	214	220
Other Noncurrent Assets: Other	1	1
Current Liabilities: Other	3	1
Current maturities of long-term debt	10	5
Long-Term Debt	224	228
DEPNCSF | Duke Energy Progress | VIE primary beneficiary
Variable Interest Entities [Line Items]
Regulatory Assets: Current	39	39
Current Assets: Other	26
Other Noncurrent Assets: Regulatory assets	701	720
Other Noncurrent Assets: Other	4	4
Current Liabilities: Other	10	2
Current maturities of long-term debt	32	15
Long-Term Debt	731	747
Commercial Renewables | VIE primary beneficiary
Variable Interest Entities [Line Items]
Current Assets: Other	215	215
Property, Plant and Equipment: Cost	7,552	7,339
Accumulated depreciation and amortization	(1,646)	(1,474)
Other Noncurrent Assets: Other	75	62
Current maturities of long-term debt	285	167
Long-Term Debt	1,255	1,475
Other Noncurrent Liabilities: AROs	176	173
Other Noncurrent Liabilities: Other	$ 213	$ 319