Severance (Narrative)(Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended	1 Months Ended
Nov. 30, 2011 2011 Severance Plan [Member] Employees	Dec. 31, 2013 Duke Energy Florida [Member] Crystal River Unit 3 2013 Severance Plan [Member]	Dec. 31, 2012 Duke Energy Florida [Member] Crystal River Unit 3 2013 Severance Plan [Member] Employees	Oct. 31, 2012 Duke Energy Ohio [Member] Duke Energy Ohio Union 2012 Severance Plan [Member] Employees
Restructuring Cost and Reserve [Line Items]
Number of employees that accepted the termination benefits	1,100			75
Number of eligible employees			600
Deferred severance costs		$ 26

The deferral in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

No definition available.

Name:	duk_DeferredSeveranceCosts
Namespace Prefix:	duk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration