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Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Sep. 30, 2018 USD ($)
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Debt Instrument [Line Items] |
Due in one year or less | $ 100
Due after one through five years | 492
Due after five through 10 years | 561
Due after 10 years | 1,154
Total | 2,307
Duke Energy Carolinas [Member] |
Debt Instrument [Line Items] |
Due in one year or less | 12
Due after one through five years | 161
Due after five through 10 years | 289
Due after 10 years | 566
Total | 1,028
Progress Energy [Member] |
Debt Instrument [Line Items] |
Due in one year or less | 83
Due after one through five years | 268
Due after five through 10 years | 217
Due after 10 years | 508
Total | 1,076
Duke Energy Progress [Member] |
Debt Instrument [Line Items] |
Due in one year or less | 40
Due after one through five years | 200
Due after five through 10 years | 156
Due after 10 years | 385
Total | 781
Duke Energy Florida [Member] |
Debt Instrument [Line Items] |
Due in one year or less | 43
Due after one through five years | 68
Due after five through 10 years | 61
Due after 10 years | 123
Total | 295
Duke Energy Indiana [Member] |
Debt Instrument [Line Items] |
Due in one year or less | 2
Due after one through five years | 20
Due after five through 10 years | 5
Due after 10 years | 13
Total | $ 40

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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 sixth through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + 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=82897076&loc=d3e27161-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + 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 second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 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=82897076&loc=d3e27161-111563 + Details
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