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Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Jun. 30, 2024 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | $ 115
Due after one through five years | 785
Due after five through 10 years | 664
Due after 10 years | 1,638
Total | 3,202
Duke Energy Carolinas |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 11
Due after one through five years | 297
Due after five through 10 years | 411
Due after 10 years | 865
Total | 1,584
Progress Energy |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 81
Due after one through five years | 403
Due after five through 10 years | 209
Due after 10 years | 679
Total | 1,372
Duke Energy Progress |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 18
Due after one through five years | 289
Due after five through 10 years | 197
Due after 10 years | 639
Total | 1,143
Duke Energy Florida |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 63
Due after one through five years | 114
Due after five through 10 years | 12
Due after 10 years | 40
Total | 229
Duke Energy Indiana |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 8
Due after one through five years | 21
Due after five through 10 years | 9
Due after 10 years | 24
Total | $ 62

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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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