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Derivatives and Hedging (Derivative Instruments with Credit-Risk Related Contingent Features and Cash Collateral) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features |  |
Aggregate fair value amounts of derivative instruments in a net liability position | $ 48 | $ 59
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered | 48 | 59
Duke Energy Carolinas [Member] |  |
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features |  |
Aggregate fair value amounts of derivative instruments in a net liability position | 26 | 35
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered | 26 | 35
Progress Energy [Member] |  |
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features |  |
Aggregate fair value amounts of derivative instruments in a net liability position | 23 | 25
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered | 23 | 25
Duke Energy Progress [Member] |  |
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features |  |
Aggregate fair value amounts of derivative instruments in a net liability position | 22 | 15
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered | $ 22 | 15
Duke Energy Florida [Member] |  |
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features |  |
Aggregate fair value amounts of derivative instruments in a net liability position |  | 10
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered |  | $ 10

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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