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Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | $ 372
Due after one through five years | 550
Due after five through 10 years | 452
Due after 10 years | 1,252
Total | 2,626
Duke Energy Carolinas |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 51
Due after one through five years | 253
Due after five through 10 years | 181
Due after 10 years | 687
Total | 1,172
Progress Energy |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 311
Due after one through five years | 256
Due after five through 10 years | 211
Due after 10 years | 469
Total | 1,247
Duke Energy Progress |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 34
Due after one through five years | 247
Due after five through 10 years | 204
Due after 10 years | 436
Total | 921
Duke Energy Florida |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 277
Due after one through five years | 9
Due after five through 10 years | 7
Due after 10 years | 33
Total | 326
Duke Energy Indiana |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 4
Due after one through five years | 16
Due after five through 10 years | 7
Due after 10 years | 17
Total | $ 44

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