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Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Dec. 31, 2022 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | $ 137
Due after one through five years | 807
Due after five through 10 years | 469
Due after 10 years | 1,402
Total | 2,815
Duke Energy Carolinas |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 7
Due after one through five years | 287
Due after five through 10 years | 230
Due after 10 years | 774
Total | 1,298
Progress Energy |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 89
Due after one through five years | 443
Due after five through 10 years | 193
Due after 10 years | 552
Total | 1,277
Duke Energy Progress |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 24
Due after one through five years | 244
Due after five through 10 years | 178
Due after 10 years | 517
Total | 963
Duke Energy Florida |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 65
Due after one through five years | 199
Due after five through 10 years | 15
Due after 10 years | 35
Total | 314
Duke Energy Indiana |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 8
Due after one through five years | 22
Due after five through 10 years | 6
Due after 10 years | 24
Total | $ 60

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