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v3.25.1

Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Mar. 31, 2025 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | $ 83
Due after one through five years | 921
Due after five through 10 years | 610
Due after 10 years | 1,914
Total | 3,528
Duke Energy Carolinas |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 5
Due after one through five years | 441
Due after five through 10 years | 286
Due after 10 years | 1,079
Total | 1,811
Progress Energy |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 75
Due after one through five years | 414
Due after five through 10 years | 273
Due after 10 years | 739
Total | 1,501
Duke Energy Progress |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 19
Due after one through five years | 334
Due after five through 10 years | 258
Due after 10 years | 689
Total | 1,300
Duke Energy Florida |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 56
Due after one through five years | 80
Due after five through 10 years | 15
Due after 10 years | 50
Total | 201
Duke Energy Indiana |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 1
Due after one through five years | 8
Due after five through 10 years | 7
Due after 10 years | 10
Total | $ 26

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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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