Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	$ 4,439
Derivative assets	382	$ 434
Total assets	13,707	12,339
Derivative liabilities	(244)	(319)
Net assets	$ 13,463	$ 12,020
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
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	$ 2	$ 2
Total assets	10,398	9,625
Derivative liabilities	(7)	(3)
Net assets	10,391	9,622
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	371	423
Total assets	3,278	2,677
Derivative liabilities	(237)	(316)
Net assets	3,041	2,361
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	9	9
Total assets	9	9
Net assets	9	9
Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	22	28
Net assets	22	28
NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	175	139
Equity securities	8,519	8,233
Debt securities	4,193	3,060
NDTF \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	175	139
Debt securities	1,480	1,022
NDTF \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	2,713	2,038
NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	8,519	8,233
NDTF equity securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	8,494	8,203
NDTF equity securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	3	2
NDTF equity securities \| Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	22	28
Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	139	160
Debt securities	246	266
Other Investments \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	139	160
Debt securities	55	52
Other Investments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	191	214
Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	53	47
Other cash and cash equivalents \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	53	47
Duke Energy Carolinas
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	2,349
Derivative assets	101	94
Total assets	7,438	6,558
Derivative liabilities	(88)	(88)
Net assets	7,350	6,470
Duke Energy Carolinas \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	5,739	5,303
Net assets	5,739	5,303
Duke Energy Carolinas \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	101	94
Total assets	1,677	1,227
Derivative liabilities	(88)	(88)
Net assets	1,589	1,139
Duke Energy Carolinas \| Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	22	28
Net assets	22	28
Duke Energy Carolinas \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	92	62
Equity securities	4,896	4,751
Debt securities	2,349	1,651
Duke Energy Carolinas \| NDTF \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	92	62
Equity securities		4,721
Debt securities	776	520
Duke Energy Carolinas \| NDTF \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities		2
Debt securities	1,573	1,131
Duke Energy Carolinas \| NDTF \| Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities		28
Duke Energy Carolinas \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	4,896
Duke Energy Carolinas \| NDTF equity securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	4,871
Duke Energy Carolinas \| NDTF equity securities \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	3
Duke Energy Carolinas \| NDTF equity securities \| Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	22
Progress Energy
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	1,868
Derivative assets	67	127
Total assets	5,675	5,142
Derivative liabilities	(48)	(58)
Net assets	5,627	5,084
Progress Energy \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	4,444	4,084
Net assets	4,444	4,084
Progress Energy \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	67	127
Total assets	1,231	1,058
Derivative liabilities	(48)	(58)
Net assets	1,183	1,000
Progress Energy \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	83	77
Equity securities	3,623	3,482
Debt securities	1,844	1,409
Progress Energy \| NDTF \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	83	77
Debt securities	704	502
Progress Energy \| NDTF \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	1,140	907
Progress Energy \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	3,623	3,482
Progress Energy \| NDTF equity securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	3,623	3,482
Progress Energy \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	24	24
Progress Energy \| Other Investments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	24	24
Progress Energy \| Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	34	23
Progress Energy \| Other cash and cash equivalents \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	34	23
Duke Energy Progress
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	1,698
Derivative assets	52	109
Total assets	5,330	4,762
Derivative liabilities	(47)	(57)
Net assets	5,283	4,705
Duke Energy Progress \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	4,177	3,797
Net assets	4,177	3,797
Duke Energy Progress \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	52	109
Total assets	1,153	965
Derivative liabilities	(47)	(57)
Net assets	1,106	908
Duke Energy Progress \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	71	54
Equity securities	3,485	3,362
Debt securities	1,698	1,221
Duke Energy Progress \| NDTF \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	71	54
Debt securities	597	365
Duke Energy Progress \| NDTF \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	1,101	856
Duke Energy Progress \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	3,485	3,362
Duke Energy Progress \| NDTF equity securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	3,485	3,362
Duke Energy Progress \| Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	24	16
Duke Energy Progress \| Other cash and cash equivalents \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	24	16
Duke Energy Florida
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	170
Derivative assets	15	18
Total assets	340	376
Derivative liabilities	(1)	(1)
Net assets	339	375
Duke Energy Florida \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total assets	262	283
Net assets	262	283
Duke Energy Florida \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	15	18
Total assets	78	93
Derivative liabilities	(1)	(1)
Net assets	77	92
Duke Energy Florida \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	12	23
Equity securities	138	120
Debt securities	146	188
Duke Energy Florida \| NDTF \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	12	23
Debt securities	107	137
Duke Energy Florida \| NDTF \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	39	51
Duke Energy Florida \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	138	120
Duke Energy Florida \| NDTF equity securities \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	138	120
Duke Energy Florida \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	24	24
Duke Energy Florida \| Other Investments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	24	24
Duke Energy Florida \| Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	5	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	5	3
Duke Energy Indiana
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	29
Derivative assets	12	44
Total assets	94	190
Derivative liabilities	(9)	(3)
Net assets	85	187
Duke Energy Indiana \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	2
Total assets	55	90
Derivative liabilities	(7)	(3)
Net assets	48	87
Duke Energy Indiana \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1	36
Total assets	30	92
Derivative liabilities	(2)
Net assets	28	92
Duke Energy Indiana \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	9	8
Total assets	9	8
Net assets	9	8
Duke Energy Indiana \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	53	89
Debt securities	29	56
Duke Energy Indiana \| Other Investments \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity securities	53	89
Duke Energy Indiana \| Other Investments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities	29	56
Duke Energy Indiana \| Other cash and cash equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		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
Piedmont
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets		1
Derivative liabilities	(72)	(94)
Net assets	(72)	(93)
Piedmont \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets		1
Net assets		1
Piedmont \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities	(72)
Net assets	$ (72)
Piedmont \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liabilities		(94)
Net assets		$ (94)

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

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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