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Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Mar. 31, 2022 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | $ 162
Due after one through five years | 969
Due after five through 10 years | 536
Due after 10 years | 1,466
Total | 3,133
Duke Energy Carolinas |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 7
Due after one through five years | 367
Due after five through 10 years | 235
Due after 10 years | 810
Total | 1,419
Progress Energy |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 139
Due after one through five years | 528
Due after five through 10 years | 228
Due after 10 years | 557
Total | 1,452
Duke Energy Progress |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 32
Due after one through five years | 270
Due after five through 10 years | 212
Due after 10 years | 517
Total | 1,031
Duke Energy Florida |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 107
Due after one through five years | 258
Due after five through 10 years | 16
Due after 10 years | 40
Total | 421
Duke Energy Indiana |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 8
Due after one through five years | 24
Due after five through 10 years | 6
Due after 10 years | 25
Total | $ 63

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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=123581744&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=123581744&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=123599081&loc=SL120269850-112803 + Details
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