Derivatives and Hedging (Derivative Instruments That Contain Credit-Risk Related Contingent Features and Cash Collateral) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
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	$ 525	$ 466
Collateral aready posted	135	163
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period	205	230
Information Regarding Cash Collateral Under Master Netting Arrangements
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Payables	30	73
Derivative, collateral, right to reclaim cash - not offset against net derivative	122	93
Duke Energy Carolinas [Member]
Information Regarding Cash Collateral Under Master Netting Arrangements
Derivative, collateral, obligation to return cash - not offset against net derivative	120	105
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	168	286
Collateral aready posted	10	59
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period	158	227
Information Regarding Cash Collateral Under Master Netting Arrangements
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Payables	10	58
Derivative, collateral, right to reclaim cash - not offset against net derivative		1
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	60	108
Collateral aready posted		9
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period	60	99
Information Regarding Cash Collateral Under Master Netting Arrangements
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Payables		9
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	108	178
Collateral aready posted	10	50
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period	98	128
Information Regarding Cash Collateral Under Master Netting Arrangements
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Payables	10	49
Derivative, collateral, right to reclaim cash - not offset against net derivative		1
Duke Energy Ohio [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	355	176
Collateral aready posted	125	104
Additional cash collateral or letters of credit in the event credit-risk-related contingent features were triggered at the end of the reporting period	47	2
Information Regarding Cash Collateral Under Master Netting Arrangements
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Payables	19	15
Derivative, collateral, right to reclaim cash - not offset against net derivative	115	92
Duke Energy Indiana [Member]
Information Regarding Cash Collateral Under Master Netting Arrangements
Amounts offset against derivative positions on the net condensed Consolidated Balance Sheets, Receivables	1
Derivative, collateral, obligation to return cash - not offset against net derivative	40	37	[1]
Derivative, collateral, right to reclaim cash - not offset against net derivative	$ 1

[1] Does not exceed 5 percent of Total current liabilities on the Consolidated Balance Sheets at December 31, 2012.