Variable Interest Entities (Schedule of Consolidated VIEs) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Variable Interest Entities [Line Items]
Regulatory Assets: Current	$ 2,334	$ 2,150
Current Assets: Other	946	638
Other Noncurrent Assets: Regulatory assets	12,506	12,487
Property, Plant and Equipment: Cost	163,700	161,819
Accumulated depreciation and amortization	(51,517)	(50,555)
Other Noncurrent Assets: Other	3,995	3,812
Current Liabilities: Other	2,001	2,471
Current maturities of long-term debt	3,884	3,387
Long-Term Debt	62,196	60,448
Other Noncurrent Liabilities: AROs	12,112	12,129
Other Noncurrent Liabilities: Other	1,794	1,650
Duke Energy Florida
Variable Interest Entities [Line Items]
Regulatory Assets: Current	505	497
Current Assets: Other	79	80
Other Noncurrent Assets: Regulatory assets	1,899	1,791
Property, Plant and Equipment: Cost	24,257	23,865
Accumulated depreciation and amortization	(6,003)	(5,819)
Other Noncurrent Assets: Other	418	399
Current Liabilities: Other	349	408
Current maturities of long-term debt	77	76
Long-Term Debt	8,374	8,406
Other Noncurrent Liabilities: AROs	411	436
Other Noncurrent Liabilities: Other	306	309
Duke Energy Carolinas
Variable Interest Entities [Line Items]
Regulatory Assets: Current	652	544
Current Assets: Other	246	95
Other Noncurrent Assets: Regulatory assets	3,085	2,935
Property, Plant and Equipment: Cost	52,423	51,874
Accumulated depreciation and amortization	(18,058)	(17,854)
Other Noncurrent Assets: Other	1,297	1,248
Current Liabilities: Other	442	546
Current maturities of long-term debt	1,367	362
Long-Term Debt	12,803	12,595
Other Noncurrent Liabilities: AROs	5,067	5,052
Other Noncurrent Liabilities: Other	545	536
Duke Energy Progress
Variable Interest Entities [Line Items]
Regulatory Assets: Current	595	533
Current Assets: Other	200	83
Other Noncurrent Assets: Regulatory assets	4,124	4,118
Property, Plant and Equipment: Cost	37,361	37,018
Accumulated depreciation and amortization	(13,691)	(13,387)
Other Noncurrent Assets: Other	867	792
Current Liabilities: Other	400	448
Current maturities of long-term debt	568	556
Long-Term Debt	10,396	9,543
Other Noncurrent Liabilities: AROs	5,411	5,401
Other Noncurrent Liabilities: Other	96	87
DEFPF | Duke Energy Florida | VIE primary beneficiary
Variable Interest Entities [Line Items]
Receivables of VIEs	5	5
Regulatory Assets: Current	54	54
Current Assets: Other	13	39
Other Noncurrent Assets: Regulatory assets	872	883
Current Liabilities: Other	2	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	4
Other Noncurrent Assets: Regulatory assets	217	220
Other Noncurrent Assets: Other	1	1
Current Liabilities: Other	2
Current maturities of long-term debt	10	5
Long-Term Debt	223	228
DEPNCSF | Duke Energy Progress | VIE primary beneficiary
Variable Interest Entities [Line Items]
Regulatory Assets: Current	39	39
Current Assets: Other	14
Other Noncurrent Assets: Regulatory assets	711	720
Other Noncurrent Assets: Other	4	4
Current Liabilities: Other	6
Current maturities of long-term debt	32	15
Long-Term Debt	730	747
Commercial Renewables | VIE primary beneficiary
Variable Interest Entities [Line Items]
Current Assets: Other	215	215
Property, Plant and Equipment: Cost	7,337	7,339
Accumulated depreciation and amortization	(1,534)	(1,474)
Other Noncurrent Assets: Other	70	62
Current maturities of long-term debt	297	167
Long-Term Debt	1,325	1,475
Other Noncurrent Liabilities: AROs	173	173
Other Noncurrent Liabilities: Other	$ 360	$ 319