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Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Dec. 31, 2024 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | $ 89
Due after one through five years | 791
Due after five through 10 years | 721
Due after 10 years | 1,725
Total | 3,326
Duke Energy Carolinas |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 9
Due after one through five years | 303
Due after five through 10 years | 441
Due after 10 years | 898
Total | 1,651
Progress Energy |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 62
Due after one through five years | 408
Due after five through 10 years | 234
Due after 10 years | 729
Total | 1,433
Duke Energy Progress |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 12
Due after one through five years | 310
Due after five through 10 years | 219
Due after 10 years | 680
Total | 1,221
Duke Energy Florida |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 50
Due after one through five years | 98
Due after five through 10 years | 15
Due after 10 years | 49
Total | 212
Duke Energy Indiana |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 4
Due after one through five years | 20
Due after five through 10 years | 12
Due after 10 years | 20
Total | $ 56

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477268/942-320-50-3A + Details
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