Employee Benefit Plans (Narrative) (Details) (Master Retirement Trust [Member])	12 Months Ended
Dec. 31, 2013
Qualified Pension Plans [Member]
Pension Plan Asset Allocation [Abstract]
Master trust allocation percentage	98.00%
Other Post-Retirement Benefit Plans [Member]
Pension Plan Asset Allocation [Abstract]
Master trust allocation percentage	2.00%

Percentage of Master Trust allocated to each type of pension plan.

No definition available.

Name:	duk_DefinedBenefitPlanMasterTrustAllocationPercentage
Namespace Prefix:	duk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration