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Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | $ 2,824 |
Derivative assets | 525 | $ 795
Total assets | 10,216 | 9,846
Derivative liabilities | (520) | (437)
Net assets (liabilities) | 9,696 | 9,409
NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 160 | 215
Estimated Fair Value | 6,530 | 5,871
Debt securities, available-for-sale | 2,569 | 2,550
NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 6,530 | 5,871
Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 36 | 22
Estimated Fair Value | 141 | 128
Debt securities, available-for-sale | 255 | 265
Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 2 | 1
Total assets | 7,625 | 7,030
Derivative liabilities | (4) | (16)
Net assets (liabilities) | 7,621 | 7,014
Level 1 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 160 | 215
Debt securities, available-for-sale | 755 | 780
Level 1 | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 6,491 | 5,829
Level 1 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 36 | 22
Estimated Fair Value | 141 | 128
Debt securities, available-for-sale | 40 | 55
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 493 | 760
Total assets | 2,522 | 2,740
Derivative liabilities | (516) | (421)
Net assets (liabilities) | 2,006 | 2,319
Level 2 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 1,814 | 1,770
Level 2 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 215 | 210
Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 30 | 34
Total assets | 30 | 34
Net assets (liabilities) | 30 | 34
Not Categorized |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets | 39 | 42
Net assets (liabilities) | 39 | 42
Not Categorized | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 39 | 42
Duke Energy Carolinas |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 1,329 |
Derivative assets | 93 | 330
Total assets | 5,248 | 5,112
Derivative liabilities | (204) | (127)
Net assets (liabilities) | 5,044 | 4,985
Duke Energy Carolinas | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 59 | 117
Estimated Fair Value | 3,767 | 3,367
Debt securities, available-for-sale | 1,329 | 1,298
Duke Energy Carolinas | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 3,767 | 3,367
Duke Energy Carolinas | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets | 4,107 | 3,765
Net assets (liabilities) | 4,107 | 3,765
Duke Energy Carolinas | Level 1 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 59 | 117
Debt securities, available-for-sale | 320 | 323
Duke Energy Carolinas | Level 1 | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 3,728 | 3,325
Duke Energy Carolinas | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 93 | 330
Total assets | 1,102 | 1,305
Derivative liabilities | (204) | (127)
Net assets (liabilities) | 898 | 1,178
Duke Energy Carolinas | Level 2 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 1,009 | 975
Duke Energy Carolinas | Not Categorized |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets | 39 | 42
Net assets (liabilities) | 39 | 42
Duke Energy Carolinas | Not Categorized | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 39 | 42
Progress Energy |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 1,263 |
Derivative assets | 196 | 248
Total assets | 4,331 | 4,138
Derivative liabilities | (137) | (66)
Net assets (liabilities) | 4,194 | 4,072
Progress Energy | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 101 | 98
Estimated Fair Value | 2,763 | 2,504
Debt securities, available-for-sale | 1,240 | 1,252
Progress Energy | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 2,763 | 2,504
Progress Energy | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 8 | 11
Debt securities, available-for-sale | 23 | 25
Progress Energy | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets | 3,307 | 3,070
Net assets (liabilities) | 3,307 | 3,070
Progress Energy | Level 1 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 101 | 98
Debt securities, available-for-sale | 435 | 457
Progress Energy | Level 1 | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 2,763 | 2,504
Progress Energy | Level 1 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 8 | 11
Progress Energy | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 196 | 248
Total assets | 1,024 | 1,068
Derivative liabilities | (137) | (66)
Net assets (liabilities) | 887 | 1,002
Progress Energy | Level 2 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 805 | 795
Progress Energy | Level 2 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 23 | 25
Duke Energy Progress |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 971 |
Derivative assets | 79 | 230
Total assets | 3,779 | 3,669
Derivative liabilities | (137) | (48)
Net assets (liabilities) | 3,642 | 3,621
Duke Energy Progress | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 62 | 56
Estimated Fair Value | 2,663 | 2,411
Debt securities, available-for-sale | 971 | 963
Duke Energy Progress | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 2,663 | 2,411
Duke Energy Progress | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 4 | 9
Duke Energy Progress | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets | 2,955 | 2,701
Net assets (liabilities) | 2,955 | 2,701
Duke Energy Progress | Level 1 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 62 | 56
Debt securities, available-for-sale | 226 | 225
Duke Energy Progress | Level 1 | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 2,663 | 2,411
Duke Energy Progress | Level 1 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 4 | 9
Duke Energy Progress | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 79 | 230
Total assets | 824 | 968
Derivative liabilities | (137) | (48)
Net assets (liabilities) | 687 | 920
Duke Energy Progress | Level 2 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 745 | 738
Duke Energy Florida |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 292 |
Derivative assets | 117 | 17
Total assets | 549 | 467
Derivative liabilities |  | (19)
Net assets (liabilities) | 549 | 448
Duke Energy Florida | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 39 | 42
Estimated Fair Value | 100 | 93
Debt securities, available-for-sale | 269 | 289
Duke Energy Florida | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 100 | 93
Duke Energy Florida | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1 | 1
Debt securities, available-for-sale | 23 | 25
Duke Energy Florida | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets | 349 | 368
Net assets (liabilities) | 349 | 368
Duke Energy Florida | Level 1 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 39 | 42
Debt securities, available-for-sale | 209 | 232
Duke Energy Florida | Level 1 | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Estimated Fair Value | 100 | 93
Duke Energy Florida | Level 1 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1 | 1
Duke Energy Florida | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 117 | 17
Total assets | 200 | 99
Derivative liabilities |  | (19)
Net assets (liabilities) | 200 | 80
Duke Energy Florida | Level 2 | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 60 | 57
Duke Energy Florida | Level 2 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 23 | 25
Duke Energy Indiana |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 59 |
Derivative assets | 55 | 110
Total assets | 205 | 250
Derivative liabilities | (4) | (16)
Net assets (liabilities) | 201 | 234
Duke Energy Indiana | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 3 | 1
Estimated Fair Value | 88 | 79
Debt securities, available-for-sale | 59 | 60
Duke Energy Indiana | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 1 |
Total assets | 92 | 80
Derivative liabilities | (4) | (16)
Net assets (liabilities) | 88 | 64
Duke Energy Indiana | Level 1 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 3 | 1
Estimated Fair Value | 88 | 79
Duke Energy Indiana | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 27 | 81
Total assets | 86 | 141
Net assets (liabilities) | 86 | 141
Duke Energy Indiana | Level 2 | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 59 | 60
Duke Energy Indiana | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 27 | 29
Total assets | 27 | 29
Net assets (liabilities) | 27 | 29
Piedmont |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 1 |
Derivative liabilities | (145) | (168)
Net assets (liabilities) | (144) | (168)
Piedmont | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 1 |
Net assets (liabilities) | 1 |
Piedmont | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative liabilities | (145) | (168)
Net assets (liabilities) | $ (145) | $ (168)

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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- 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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- 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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- 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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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or 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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