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Investments in Debt and Equity Securities (Maturities) (Details) $ in Millions | Jun. 30, 2018 USD ($)
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Debt Instrument [Line Items] |
Due in one year or less | $ 89
Due after one through five years | 518
Due after five through 10 years | 543
Due after 10 years | 1,122
Total | 2,272
Duke Energy Carolinas [Member] |
Debt Instrument [Line Items] |
Due in one year or less | 12
Due after one through five years | 163
Due after five through 10 years | 286
Due after 10 years | 556
Total | 1,017
Progress Energy [Member] |
Debt Instrument [Line Items] |
Due in one year or less | 69
Due after one through five years | 286
Due after five through 10 years | 207
Due after 10 years | 488
Total | 1,050
Duke Energy Progress [Member] |
Debt Instrument [Line Items] |
Due in one year or less | 24
Due after one through five years | 214
Due after five through 10 years | 150
Due after 10 years | 374
Total | 762
Duke Energy Florida [Member] |
Debt Instrument [Line Items] |
Due in one year or less | 45
Due after one through five years | 72
Due after five through 10 years | 57
Due after 10 years | 114
Total | 288
Duke Energy Indiana [Member] |
Debt Instrument [Line Items] |
Due in one year or less | 3
Due after one through five years | 20
Due after five through 10 years | 4
Due after 10 years | 14
Total | $ 41

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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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