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Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Dec. 31, 2021 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | $ 159
Due after one through five years | 957
Due after five through 10 years | 550
Due after 10 years | 1,525
Total | 3,191
Duke Energy Carolinas |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 3
Due after one through five years | 337
Due after five through 10 years | 226
Due after 10 years | 875
Total | 1,441
Progress Energy |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 138
Due after one through five years | 546
Due after five through 10 years | 248
Due after 10 years | 544
Total | 1,476
Duke Energy Progress |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 31
Due after one through five years | 256
Due after five through 10 years | 231
Due after 10 years | 507
Total | 1,025
Duke Energy Florida |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 107
Due after one through five years | 290
Due after five through 10 years | 17
Due after 10 years | 37
Total | 451
Duke Energy Indiana |
Debt Securities, Available-for-sale [Line Items] |
Due in one year or less | 7
Due after one through five years | 25
Due after five through 10 years | 10
Due after 10 years | 22
Total | $ 64

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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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