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v3.23.1

Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Mar. 31, 2023 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 | 793
Due after five through 10 years | 522
Due after 10 years | 1,443
Total | 2,873
Duke Energy Carolinas |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 5
Due after one through five years | 277
Due after five through 10 years | 262
Due after 10 years | 785
Total | 1,329
Progress Energy |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 96
Due after one through five years | 424
Due after five through 10 years | 207
Due after 10 years | 564
Total | 1,291
Duke Energy Progress |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 19
Due after one through five years | 238
Due after five through 10 years | 194
Due after 10 years | 526
Total | 977
Duke Energy Florida |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 77
Due after one through five years | 186
Due after five through 10 years | 13
Due after 10 years | 38
Total | 314
Duke Energy Indiana |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 6
Due after one through five years | 23
Due after five through 10 years | 11
Due after 10 years | 24
Total | $ 64

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