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Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Mar. 31, 2024 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | $ 126
Due after one through five years | 715
Due after five through 10 years | 614
Due after 10 years | 1,626
Total | 3,081
Duke Energy Carolinas |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 10
Due after one through five years | 245
Due after five through 10 years | 359
Due after 10 years | 866
Total | 1,480
Progress Energy |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 101
Due after one through five years | 389
Due after five through 10 years | 206
Due after 10 years | 658
Total | 1,354
Duke Energy Progress |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 23
Due after one through five years | 264
Due after five through 10 years | 192
Due after 10 years | 618
Total | 1,097
Duke Energy Florida |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 78
Due after one through five years | 125
Due after five through 10 years | 14
Due after 10 years | 40
Total | 257
Duke Energy Indiana |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 9
Due after one through five years | 18
Due after five through 10 years | 11
Due after 10 years | 25
Total | $ 63

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