Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

Estimated remaining performance obligations are as follows:

	Remaining Performance Obligations
(in millions)	2018		2019		2020		2021		2022		Thereafter		Total
Piedmont	$	55	$	72	$	70	$	65	$	64	$	482	$	808

Supplemental requirements contracts that include contracted blocks of energy and capacity at contractually fixed prices have the following estimated remaining performance obligations:

	Remaining Performance Obligations
(in millions)	2018		2019		2020		2021		2022		Thereafter		Total
Progress Energy	$	69	$	112	$	121	$	80	$	82	$	81	$	545
Duke Energy Progress	7		9		9		9		9		18		61
Duke Energy Florida	62		103		112		71		73		63		484
Duke Energy Indiana	6		9		10		5		—		—		30

Disaggregation of Revenue

Disaggregated revenues are presented as follows:

	Three Months Ended March 31, 2018
			Duke				Duke		Duke		Duke		Duke
(in millions)	Duke		Energy		Progress		Energy		Energy		Energy		Energy
By market or type of customer	Energy		Carolinas		Energy		Progress		Florida		Ohio		Indiana		Piedmont
Electric Utilities and Infrastructure
Residential	$	2,350	$	781	$	1,112	$	516	$	595	$	180	$	278	$	—
General	1,375		472		631		299		333		96		178		—
Industrial	664		255		208		145		62		30		173		—
Wholesale	633		119		446		397		50		—		68		—
Other revenues	139		67		129		85		43		14		17		—
Total Electric Utilities and Infrastructure revenue from contracts with customers	$	5,161	$	1,694	$	2,526	$	1,442	$	1,083	$	320	$	714	$	—
Gas Utilities and Infrastructure
Residential	$	413	$	—	$	—	$	—	$	—	$	111	$	—	$	302
Commercial	201		—		—		—		—		49		—		152
Industrial	48		—		—		—		—		7		—		41
Power Generation	—		—		—		—		—		—		—		13
Other revenues	55		—		—		—		—		6		—		49
Total Gas Utilities and Infrastructure revenue from contracts with customers	$	717	$	—	$	—	$	—	$	—	$	173	$	—	$	557
Commercial Renewables
Revenue from contracts with customers	$	33	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Other
Revenue from contracts with customers	$	17	$	—	$	—	$	—	$	—	$	14	$	—	$	—
Total revenue from contracts with customers	$	5,928	$	1,694	$	2,526	$	1,442	$	1,083	$	507	$	714	$	557
Other revenue sources (a)	$	207	$	69	$	50	$	18	$	32	$	17	$	17	$	(4	)
Total revenues	$	6,135	$	1,763	$	2,576	$	1,460	$	1,115	$	524	$	731	$	553

(a) Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Piedmont has regulatory mechanisms that periodically provide rate adjustments to refund any over-collection or to recover any under-collection of margin.

Schedule Of Unbilled Revenues With Restricted Receivables

These receivables for unbilled revenues are shown in the table below.

(in millions)	March 31, 2018		December 31, 2017
Duke Energy Ohio	$	67	$	104
Duke Energy Indiana	108		132

Unbilled revenues are included within Receivables and Receivables of variable interest entities (VIEs) on the Condensed Consolidated Balance Sheets as shown in the following table.

(in millions)	March 31, 2018		December 31, 2017
Duke Energy	$	823	$	944
Duke Energy Carolinas	310		342
Progress Energy	237		228
Duke Energy Progress	167		143
Duke Energy Florida	70		85
Duke Energy Ohio	2		4
Duke Energy Indiana	24		21
Piedmont	45		86