Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	$ 3,326
Derivative assets	434	$ 189
Total assets	12,339	10,792
Derivative liabilities	(319)	(729)
Net assets	$ 12,020	$ 10,063
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other (including amounts related to VIEs)	Other (including amounts related to VIEs)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other (includes $54 at 2023 related to VIEs)
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	$ 2	$ 37
Total assets	9,625	8,484
Derivative liabilities	(3)	(60)
Net assets	9,622	8,424
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	423	137
Total assets	2,677	2,256
Derivative liabilities	(316)	(669)
Net assets	2,361	1,587
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	9	15
Total assets	9	15
Net assets	9	15
Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	28	37
Net assets	28	37
NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	139	133
Equity securities	8,233	7,278
Debt securities	3,060	2,732
NDTF \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	139	133
Debt securities	1,022	829
NDTF \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	2,038	1,903
NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	8,233	7,278
NDTF equity securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	8,203	7,241
NDTF equity securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	2
NDTF equity securities \| Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	28	37
Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	160	158
Debt securities	266	271
Other Investments \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	160	158
Debt securities	52	55
Other Investments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	214	216
Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	47	31
Other cash and cash equivalents \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	47	31
Duke Energy Carolinas
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	1,651
Derivative assets	94	35
Total assets	6,558	5,720
Derivative liabilities	(88)	(260)
Net assets	6,470	5,460
Duke Energy Carolinas \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	5,303	4,585
Net assets	5,303	4,585
Duke Energy Carolinas \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	94	35
Total assets	1,227	1,098
Derivative liabilities	(88)	(260)
Net assets	1,139	838
Duke Energy Carolinas \| Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	28	37
Net assets	28	37
Duke Energy Carolinas \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	62	51
Equity securities	4,751	4,196
Debt securities	1,651	1,438
Duke Energy Carolinas \| NDTF \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	62	51
Equity securities		4,159
Debt securities	520	375
Duke Energy Carolinas \| NDTF \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	1,131	1,063
Duke Energy Carolinas \| NDTF \| Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities		37
Duke Energy Carolinas \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	4,751
Duke Energy Carolinas \| NDTF equity securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	4,721
Duke Energy Carolinas \| NDTF equity securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	2
Duke Energy Carolinas \| NDTF equity securities \| Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	28
Progress Energy
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	1,433
Derivative assets	127	34
Total assets	5,142	4,533
Derivative liabilities	(58)	(234)
Net assets	5,084	4,299
Progress Energy \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	4,084	3,636
Net assets	4,084	3,636
Progress Energy \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	127	34
Total assets	1,058	897
Derivative liabilities	(58)	(234)
Net assets	1,000	663
Progress Energy \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	77	82
Equity securities	3,482	3,082
Debt securities	1,409	1,294
Progress Energy \| NDTF \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	77	82
Debt securities	502	454
Progress Energy \| NDTF \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	907	840
Progress Energy \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	3,482	3,082
Progress Energy \| NDTF equity securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	3,482	3,082
Progress Energy \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	24	23
Progress Energy \| Other Investments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	24	23
Progress Energy \| Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	23	18
Progress Energy \| Other cash and cash equivalents \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	23	18
Duke Energy Progress
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	1,221
Derivative assets	109	32
Total assets	4,762	4,121
Derivative liabilities	(57)	(219)
Net assets	4,705	3,902
Duke Energy Progress \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	3,797	3,305
Net assets	3,797	3,305
Duke Energy Progress \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	109	32
Total assets	965	816
Derivative liabilities	(57)	(219)
Net assets	908	597
Duke Energy Progress \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	54	55
Equity securities	3,362	2,970
Debt securities	1,221	1,050
Duke Energy Progress \| NDTF \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	54	55
Debt securities	365	266
Duke Energy Progress \| NDTF \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	856	784
Duke Energy Progress \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	3,362	2,970
Duke Energy Progress \| NDTF equity securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	3,362	2,970
Duke Energy Progress \| Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	16	14
Duke Energy Progress \| Other cash and cash equivalents \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	16	14
Duke Energy Florida
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	212
Derivative assets	18	2
Total assets	376	411
Derivative liabilities	(1)	(15)
Net assets	375	396
Duke Energy Florida \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	283	330
Net assets	283	330
Duke Energy Florida \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	18	2
Total assets	93	81
Derivative liabilities	(1)	(15)
Net assets	92	66
Duke Energy Florida \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	23	27
Equity securities	120	112
Debt securities	188	244
Duke Energy Florida \| NDTF \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	23	27
Debt securities	137	188
Duke Energy Florida \| NDTF \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	51	56
Duke Energy Florida \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	120	112
Duke Energy Florida \| NDTF equity securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	120	112
Duke Energy Florida \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	24	23
Duke Energy Florida \| Other Investments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	24	23
Duke Energy Florida \| Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3	3
Duke Energy Florida \| Other cash and cash equivalents \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3	3
Duke Energy Indiana
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	56
Derivative assets	44	25
Total assets	190	188
Derivative liabilities	(3)	(18)
Net assets	187	170
Duke Energy Indiana \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets		5
Total assets	90	104
Derivative liabilities	(3)	(18)
Net assets	87	86
Duke Energy Indiana \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	36	7
Total assets	92	71
Net assets	92	71
Duke Energy Indiana \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	8	13
Total assets	8	13
Net assets	8	13
Duke Energy Indiana \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	89	98
Debt securities	56	64
Duke Energy Indiana \| Other Investments \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	89	98
Duke Energy Indiana \| Other Investments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	56	64
Duke Energy Indiana \| Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1	1
Duke Energy Indiana \| Other cash and cash equivalents \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1	1
Piedmont
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1	1
Derivative liabilities	(94)	(147)
Net assets	(93)	(146)
Piedmont \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1	1
Net assets	1	1
Piedmont \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	(94)
Net assets	$ (94)
Piedmont \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(147)
Net assets		$ (147)

Fair value portion of asset recognized for present right to economic benefit.

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