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Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Sep. 30, 2020 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | $ 53
Due after one through five years | 558
Due after five through 10 years | 608
Due after 10 years | 1,313
Total | 2,532
Duke Energy Carolinas |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 13
Due after one through five years | 247
Due after five through 10 years | 278
Due after 10 years | 694
Total | 1,232
Progress Energy |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 15
Due after one through five years | 256
Due after five through 10 years | 232
Due after 10 years | 542
Total | 1,045
Duke Energy Progress |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 14
Due after one through five years | 246
Due after five through 10 years | 224
Due after 10 years | 508
Total | 992
Duke Energy Florida |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 1
Due after one through five years | 10
Due after five through 10 years | 8
Due after 10 years | 34
Total | 53
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 | 9
Due after 10 years | 16
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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- 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 next 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120252992&loc=SL120269850-112803 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 Reference 3: 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 + Details
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