v2.4.0.8

Regulatory Matters (Refunds) (Details) (Duke Energy Florida [Member], USD $) In Millions, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2014
Florida Public Service Commission Settlement Agreement 2012 [Member] |
Regulatory Assets Liabilities [Line Items] |
Total | $ 288
Refunded to date | 233
2014 | 35
2015 | 10
2016 | 10
Retirement Decision Credits [Member] |
Regulatory Assets Liabilities [Line Items] |
Total | 100
Refunded to date |
2014 |
2015 | 40
2016 | 60
Neil Settlement [Member] |
Regulatory Assets Liabilities [Line Items] |
Total | 490
Refunded to date | 449
2014 | 41
2015 |
2016 |
Total Customer Refunds [Member] |
Regulatory Assets Liabilities [Line Items] |
Total | 878
Refunded to date | 682
2014 | 76
2015 | 50
2016 | 70
Accelerated Regulatory Asset Recovery [Member] |
Regulatory Assets Liabilities [Line Items] |
Total | (130)
Refunded to date | (28)
2014 | (9)
2015 | (37)
2016 | (56)
Net Customer Refunds [Member] |
Regulatory Assets Liabilities [Line Items] |
Total | 748
Refunded to date | 654
2014 | 67
2015 | 13
2016 | $ 14

X
- Definition Amount of customer refunds to be paid in the next fiscal year. + References No definition available. + Details
Name: | duk_CustomerRefundsToBePaidInNextFiscalYear
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of customer refunds to be paid in the third fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | duk_CustomerRefundsToBePaidYearThree
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of customer refunds to be paid in the second fiscal year following the latest fiscal year. + References No definition available. + Details
Name: | duk_CustomerRefundsToBePaidYearTwo
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of refund recorded to customers to date. + References No definition available. + Details
Name: | duk_CustomerRefundsToDate
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | duk_RegulatoryAssetsLiabilitiesLineItems
Namespace Prefix: | duk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of total customer refunds to be paid. + References No definition available. + Details
Name: | duk_TotalCustomerRefundsToBePaid
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration