Variable Interest Entities (Consolidated VIEs) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Regulatory Assets: Current	$ 2,150	$ 1,641
Current Assets: Other	638	462
Property, Plant and Equipment: Cost	161,819	155,580
Accumulated depreciation and amortization	(50,555)	(48,827)
Other Noncurrent Assets: Other	3,812	3,601
Other Noncurrent Assets: Regulatory assets	12,487	12,421
Current Liabilities: Other	2,471	2,936
Current maturities of long-term debt	3,387	4,238
Long-Term Debt	60,448	55,625
Asset retirement obligations	12,129	12,286
Other Noncurrent Liabilities: Other	1,650	1,719
Duke Energy Florida
Variable Interest Entity [Line Items]
Regulatory Assets: Current	497	265
Current Assets: Other	80	41
Property, Plant and Equipment: Cost	23,865	22,123
Accumulated depreciation and amortization	(5,819)	(5,560)
Other Noncurrent Assets: Other	399	335
Other Noncurrent Assets: Regulatory assets	1,791	1,799
Current Liabilities: Other	408	374
Current maturities of long-term debt	76	823
Long-Term Debt	8,406	7,092
Asset retirement obligations	436	514
Other Noncurrent Liabilities: Other	309	209
Duke Energy Carolinas
Variable Interest Entity [Line Items]
Regulatory Assets: Current	544	473
Current Assets: Other	95	20
Property, Plant and Equipment: Cost	51,874	50,640
Accumulated depreciation and amortization	(17,854)	(17,453)
Other Noncurrent Assets: Other	1,248	1,187
Other Noncurrent Assets: Regulatory assets	2,935	2,996
Current Liabilities: Other	546	546
Current maturities of long-term debt	362	506
Long-Term Debt	12,595	11,412
Asset retirement obligations	5,052	5,086
Other Noncurrent Liabilities: Other	536	626
Duke Energy Progress
Variable Interest Entity [Line Items]
Regulatory Assets: Current	533	492
Current Assets: Other	83	60
Property, Plant and Equipment: Cost	37,018	35,759
Accumulated depreciation and amortization	(13,387)	(12,801)
Other Noncurrent Assets: Other	792	740
Other Noncurrent Assets: Regulatory assets	4,118	3,976
Current Liabilities: Other	448	411
Current maturities of long-term debt	556	603
Long-Term Debt	9,543	8,505
Asset retirement obligations	5,401	5,352
Other Noncurrent Liabilities: Other	87	102
DEFPF | Duke Energy Florida | Consolidated VIEs
Variable Interest Entity [Line Items]
Receivables of VIEs	5	4
Regulatory Assets: Current	54	53
Current Assets: Other	39	39
Other Noncurrent Assets: Regulatory assets	883	937
Current Liabilities: Other	9	10
Current maturities of long-term debt	56	55
Long-Term Debt	946	1,002
DECNCSF | Duke Energy Carolinas | Consolidated VIEs
Variable Interest Entity [Line Items]
Regulatory Assets: Current	12
Other Noncurrent Assets: Other	1
Other Noncurrent Assets: Regulatory assets	220
Current Liabilities: Other	1
Current maturities of long-term debt	5
Long-Term Debt	228
DEPNCSF | Duke Energy Progress | Consolidated VIEs
Variable Interest Entity [Line Items]
Regulatory Assets: Current	39
Other Noncurrent Assets: Other	4
Other Noncurrent Assets: Regulatory assets	720
Current Liabilities: Other	2
Current maturities of long-term debt	15
Long-Term Debt	747
Commercial Renewables | Consolidated VIEs
Variable Interest Entity [Line Items]
Current Assets: Other	215	257
Property, Plant and Equipment: Cost	7,339	6,394
Accumulated depreciation and amortization	(1,474)	(1,242)
Other Noncurrent Assets: Other	62	67
Current maturities of long-term debt	167	167
Long-Term Debt	1,475	1,569
Asset retirement obligations	173	148
Other Noncurrent Liabilities: Other	$ 319	$ 316