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Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Jun. 30, 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 | 930
Due after five through 10 years | 484
Due after 10 years | 1,417
Total | 2,968
Duke Energy Carolinas |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 7
Due after one through five years | 350
Due after five through 10 years | 209
Due after 10 years | 777
Total | 1,343
Progress Energy |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 118
Due after one through five years | 501
Due after five through 10 years | 204
Due after 10 years | 553
Total | 1,376
Duke Energy Progress |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 24
Due after one through five years | 266
Due after five through 10 years | 189
Due after 10 years | 515
Total | 994
Duke Energy Florida |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 94
Due after one through five years | 235
Due after five through 10 years | 15
Due after 10 years | 38
Total | 382
Duke Energy Indiana |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 9
Due after one through five years | 23
Due after five through 10 years | 6
Due after 10 years | 23
Total | $ 61

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