Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	$ 3,202
Derivative assets	247	$ 189
Total assets	11,760	10,792
Derivative liabilities	(473)	(729)
Net assets (liabilities)	11,287	10,063
NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	151	133
Estimated Fair Value	7,859	7,278
Debt securities, available-for-sale	2,933	2,732
NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	7,859	7,278
Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	124	31
Estimated Fair Value	177	158
Debt securities, available-for-sale	269	271
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	3	37
Total assets	9,246	8,484
Derivative liabilities	(39)	(60)
Net assets (liabilities)	9,207	8,424
Level 1 \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	151	133
Debt securities, available-for-sale	917	829
Level 1 \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	7,827	7,241
Level 1 \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	124	31
Estimated Fair Value	177	158
Debt securities, available-for-sale	47	55
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	209	137
Total assets	2,447	2,256
Derivative liabilities	(434)	(669)
Net assets (liabilities)	2,013	1,587
Level 2 \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	2,016	1,903
Level 2 \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	0	0
Level 2 \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Estimated Fair Value	0	0
Debt securities, available-for-sale	222	216
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	35	15
Total assets	35	15
Derivative liabilities	0	0
Net assets (liabilities)	35	15
Level 3 \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	0	0
Level 3 \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	0	0
Level 3 \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Estimated Fair Value	0	0
Debt securities, available-for-sale	0	0
Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Total assets	32	37
Derivative liabilities	0	0
Net assets (liabilities)	32	37
Not Categorized \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	0	0
Not Categorized \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	32	37
Not Categorized \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Estimated Fair Value	0	0
Debt securities, available-for-sale	0	0
Duke Energy Carolinas
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,584
Derivative assets	46	35
Total assets	6,214	5,720
Derivative liabilities	(161)	(260)
Net assets (liabilities)	6,053	5,460
Duke Energy Carolinas \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	57	51
Estimated Fair Value	4,527	4,196
Debt securities, available-for-sale	1,584	1,438
Duke Energy Carolinas \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	4,527	4,196
Duke Energy Carolinas \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Total assets	5,007	4,585
Derivative liabilities	0	0
Net assets (liabilities)	5,007	4,585
Duke Energy Carolinas \| Level 1 \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	57	51
Debt securities, available-for-sale	455	375
Duke Energy Carolinas \| Level 1 \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	4,495	4,159
Duke Energy Carolinas \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	46	35
Total assets	1,175	1,098
Derivative liabilities	(161)	(260)
Net assets (liabilities)	1,014	838
Duke Energy Carolinas \| Level 2 \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	1,129	1,063
Duke Energy Carolinas \| Level 2 \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	0	0
Duke Energy Carolinas \| Not Categorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Total assets	32	37
Derivative liabilities	0	0
Net assets (liabilities)	32	37
Duke Energy Carolinas \| Not Categorized \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	0	0
Duke Energy Carolinas \| Not Categorized \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	32	37
Progress Energy
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,372
Derivative assets	64	34
Total assets	4,887	4,533
Derivative liabilities	(119)	(234)
Net assets (liabilities)	4,768	4,299
Progress Energy \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	94	82
Estimated Fair Value	3,332	3,082
Debt securities, available-for-sale	1,349	1,294
Progress Energy \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	3,332	3,082
Progress Energy \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	25	18
Debt securities, available-for-sale	23	23
Progress Energy \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Total assets	3,913	3,636
Derivative liabilities	0	0
Net assets (liabilities)	3,913	3,636
Progress Energy \| Level 1 \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	94	82
Debt securities, available-for-sale	462	454
Progress Energy \| Level 1 \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	3,332	3,082
Progress Energy \| Level 1 \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	25	18
Debt securities, available-for-sale	0	0
Progress Energy \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	64	34
Total assets	974	897
Derivative liabilities	(119)	(234)
Net assets (liabilities)	855	663
Progress Energy \| Level 2 \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	887	840
Progress Energy \| Level 2 \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	0	0
Progress Energy \| Level 2 \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	23	23
Duke Energy Progress
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	1,143
Derivative assets	63	32
Total assets	4,506	4,121
Derivative liabilities	(118)	(219)
Net assets (liabilities)	4,388	3,902
Duke Energy Progress \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	77	55
Estimated Fair Value	3,205	2,970
Debt securities, available-for-sale	1,143	1,050
Duke Energy Progress \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	3,205	2,970
Duke Energy Progress \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	18	14
Duke Energy Progress \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Total assets	3,605	3,305
Derivative liabilities	0	0
Net assets (liabilities)	3,605	3,305
Duke Energy Progress \| Level 1 \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	77	55
Debt securities, available-for-sale	305	266
Duke Energy Progress \| Level 1 \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	3,205	2,970
Duke Energy Progress \| Level 1 \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	18	14
Duke Energy Progress \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	63	32
Total assets	901	816
Derivative liabilities	(118)	(219)
Net assets (liabilities)	783	597
Duke Energy Progress \| Level 2 \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	838	784
Duke Energy Progress \| Level 2 \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	0	0
Duke Energy Progress \| Level 2 \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Duke Energy Florida
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	229
Derivative assets	1	2
Total assets	377	411
Derivative liabilities	(2)	(15)
Net assets (liabilities)	375	396
Duke Energy Florida \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	17	27
Estimated Fair Value	127	112
Debt securities, available-for-sale	206	244
Duke Energy Florida \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	127	112
Duke Energy Florida \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3	3
Debt securities, available-for-sale	23	23
Duke Energy Florida \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Total assets	304	330
Derivative liabilities	0	0
Net assets (liabilities)	304	330
Duke Energy Florida \| Level 1 \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	17	27
Debt securities, available-for-sale	157	188
Duke Energy Florida \| Level 1 \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	127	112
Duke Energy Florida \| Level 1 \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	3	3
Debt securities, available-for-sale	0	0
Duke Energy Florida \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1	2
Total assets	73	81
Derivative liabilities	(2)	(15)
Net assets (liabilities)	71	66
Duke Energy Florida \| Level 2 \| NDTF
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	49	56
Duke Energy Florida \| Level 2 \| NDTF equity securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value	0	0
Duke Energy Florida \| Level 2 \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Debt securities, available-for-sale	23	23
Duke Energy Indiana
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt securities, available-for-sale	62
Derivative assets	58	25
Total assets	232	188
Derivative liabilities	(8)	(18)
Net assets (liabilities)	224	170
Duke Energy Indiana \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2	1
Estimated Fair Value	110	98
Debt securities, available-for-sale	62	64
Duke Energy Indiana \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	3	5
Total assets	115	104
Derivative liabilities	(8)	(18)
Net assets (liabilities)	107	86
Duke Energy Indiana \| Level 1 \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	2	1
Estimated Fair Value	110	98
Debt securities, available-for-sale	0	0
Duke Energy Indiana \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	22	7
Total assets	84	71
Derivative liabilities	0	0
Net assets (liabilities)	84	71
Duke Energy Indiana \| Level 2 \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Estimated Fair Value	0	0
Debt securities, available-for-sale	62	64
Duke Energy Indiana \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	33	13
Total assets	33	13
Derivative liabilities	0	0
Net assets (liabilities)	33	13
Duke Energy Indiana \| Level 3 \| Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Estimated Fair Value	0	0
Debt securities, available-for-sale	0	0
Piedmont
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1	1
Derivative liabilities	(132)	(147)
Net assets (liabilities)	(131)	(146)
Piedmont \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	1	1
Derivative liabilities	0	0
Net assets (liabilities)	1	1
Piedmont \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	0	0
Derivative liabilities	(132)	(147)
Net assets (liabilities)	$ (132)	$ (147)

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

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- Definition

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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- Definition

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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