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Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | $ 149
Due after one through five years | 922
Due after five through 10 years | 671
Due after 10 years | 1,260
Total | 3,002
Duke Energy Carolinas |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 14
Due after one through five years | 299
Due after five through 10 years | 279
Due after 10 years | 658
Total | 1,250
Progress Energy |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 109
Due after one through five years | 567
Due after five through 10 years | 298
Due after 10 years | 519
Total | 1,493
Duke Energy Progress |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 21
Due after one through five years | 259
Due after five through 10 years | 210
Due after 10 years | 503
Total | 993
Duke Energy Florida |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 88
Due after one through five years | 308
Due after five through 10 years | 88
Due after 10 years | 16
Total | 500
Duke Energy Indiana |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 3
Due after one through five years | 17
Due after five through 10 years | 10
Due after 10 years | 15
Total | $ 45

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 + Details
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