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Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | $ 3,081 |
Derivative assets | 255 | $ 189
Total assets | 11,507 | 10,792
Derivative liabilities | (612) | (729)
Net assets (liabilities) | 10,895 | 10,063
NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 140 | 133
Estimated Fair Value | 7,837 | 7,278
Debt securities, available-for-sale | 2,810 | 2,732
NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 7,837 | 7,278
Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 21 | 31
Estimated Fair Value | 173 | 158
Debt securities, available-for-sale | 271 | 271
Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 77 | 37
Total assets | 9,136 | 8,484
Derivative liabilities | (51) | (60)
Net assets (liabilities) | 9,085 | 8,424
Level 1 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 140 | 133
Debt securities, available-for-sale | 873 | 829
Level 1 | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 7,802 | 7,241
Level 1 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 21 | 31
Estimated Fair Value | 173 | 158
Debt securities, available-for-sale | 50 | 55
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 172 | 137
Total assets | 2,330 | 2,256
Derivative liabilities | (561) | (669)
Net assets (liabilities) | 1,769 | 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 | 1,937 | 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 | 221 | 216
Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 6 | 15
Total assets | 6 | 15
Derivative liabilities | 0 | 0
Net assets (liabilities) | 6 | 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 | 35 | 37
Derivative liabilities | 0 | 0
Net assets (liabilities) | 35 | 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 | 35 | 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 | 1,480 |
Derivative assets | 35 | 35
Total assets | 6,110 | 5,720
Derivative liabilities | (234) | (260)
Net assets (liabilities) | 5,876 | 5,460
Duke Energy Carolinas | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 81 | 51
Estimated Fair Value | 4,514 | 4,196
Debt securities, available-for-sale | 1,480 | 1,438
Duke Energy Carolinas | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 4,514 | 4,196
Duke Energy Carolinas | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 0 |
Duke Energy Carolinas | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 0 | 0
Total assets | 4,978 | 4,585
Derivative liabilities | 0 | 0
Net assets (liabilities) | 4,978 | 4,585
Duke Energy Carolinas | Level 1 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 81 | 51
Debt securities, available-for-sale | 418 | 375
Duke Energy Carolinas | Level 1 | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 4,479 | 4,159
Duke Energy Carolinas | Level 1 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 0 |
Duke Energy Carolinas | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 35 | 35
Total assets | 1,097 | 1,098
Derivative liabilities | (234) | (260)
Net assets (liabilities) | 863 | 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 | 1,062 | 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 | Level 2 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 0 |
Duke Energy Carolinas | Not Categorized |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 0 | 0
Total assets | 35 | 37
Derivative liabilities | 0 | 0
Net assets (liabilities) | 35 | 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 | 35 | 37
Duke Energy Carolinas | Not Categorized | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 0 |
Progress Energy |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 1,354 |
Derivative assets | 57 | 34
Total assets | 4,808 | 4,533
Derivative liabilities | (188) | (234)
Net assets (liabilities) | 4,620 | 4,299
Progress Energy | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 59 | 82
Estimated Fair Value | 3,323 | 3,082
Debt securities, available-for-sale | 1,330 | 1,294
Progress Energy | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 3,323 | 3,082
Progress Energy | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 15 | 18
Debt securities, available-for-sale | 24 | 23
Progress Energy | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 0 | 0
Total assets | 3,852 | 3,636
Derivative liabilities | 0 | 0
Net assets (liabilities) | 3,852 | 3,636
Progress Energy | Level 1 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 59 | 82
Debt securities, available-for-sale | 455 | 454
Progress Energy | Level 1 | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 3,323 | 3,082
Progress Energy | Level 1 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 15 | 18
Debt securities, available-for-sale | 0 | 0
Progress Energy | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 57 | 34
Total assets | 956 | 897
Derivative liabilities | (188) | (234)
Net assets (liabilities) | 768 | 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 | 875 | 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 | 24 | 23
Duke Energy Progress |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 1,097 |
Derivative assets | 47 | 32
Total assets | 4,404 | 4,121
Derivative liabilities | (181) | (219)
Net assets (liabilities) | 4,223 | 3,902
Duke Energy Progress | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 48 | 55
Estimated Fair Value | 3,200 | 2,970
Debt securities, available-for-sale | 1,097 | 1,050
Duke Energy Progress | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 3,200 | 2,970
Duke Energy Progress | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 12 | 14
Duke Energy Progress | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 0 | 0
Total assets | 3,540 | 3,305
Derivative liabilities | 0 | 0
Net assets (liabilities) | 3,540 | 3,305
Duke Energy Progress | Level 1 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 48 | 55
Debt securities, available-for-sale | 280 | 266
Duke Energy Progress | Level 1 | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 3,200 | 2,970
Duke Energy Progress | Level 1 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 12 | 14
Duke Energy Progress | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 47 | 32
Total assets | 864 | 816
Derivative liabilities | (181) | (219)
Net assets (liabilities) | 683 | 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 | 817 | 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 | 257 |
Derivative assets | 10 | 2
Total assets | 403 | 411
Derivative liabilities | (7) | (15)
Net assets (liabilities) | 396 | 396
Duke Energy Florida | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 11 | 27
Estimated Fair Value | 123 | 112
Debt securities, available-for-sale | 233 | 244
Duke Energy Florida | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 123 | 112
Duke Energy Florida | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 2 | 3
Debt securities, available-for-sale | 24 | 23
Duke Energy Florida | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 0 | 0
Total assets | 311 | 330
Derivative liabilities | 0 | 0
Net assets (liabilities) | 311 | 330
Duke Energy Florida | Level 1 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 11 | 27
Debt securities, available-for-sale | 175 | 188
Duke Energy Florida | Level 1 | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 123 | 112
Duke Energy Florida | Level 1 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 2 | 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 | 10 | 2
Total assets | 92 | 81
Derivative liabilities | (7) | (15)
Net assets (liabilities) | 85 | 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 | 58 | 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 | 24 | 23
Duke Energy Indiana |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 63 |
Derivative assets | 24 | 25
Total assets | 196 | 188
Derivative liabilities | (19) | (18)
Net assets (liabilities) | 177 | 170
Duke Energy Indiana | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1 | 1
Estimated Fair Value | 108 | 98
Debt securities, available-for-sale | 63 | 64
Duke Energy Indiana | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 2 | 5
Total assets | 111 | 104
Derivative liabilities | (19) | (18)
Net assets (liabilities) | 92 | 86
Duke Energy Indiana | Level 1 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1 | 1
Estimated Fair Value | 108 | 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 | 17 | 7
Total assets | 80 | 71
Derivative liabilities | 0 | 0
Net assets (liabilities) | 80 | 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 | 63 | 64
Duke Energy Indiana | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 5 | 13
Total assets | 5 | 13
Derivative liabilities | 0 | 0
Net assets (liabilities) | 5 | 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 | (126) | (147)
Net assets (liabilities) | (125) | (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 | (126) | (147)
Net assets (liabilities) | $ (126) | $ (147)

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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X
- Definition 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. + References No definition available. + Details
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X
- 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. 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