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Revenue (Tables)
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction 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)20212022202320242025ThereafterTotal
Progress Energy$71 $107 $44 $45 $7 $51 $325 
Duke Energy Progress6 8 8 8 — — 30 
Duke Energy Florida65 99 36 37 7 51 295 
Duke Energy Indiana2 — 7 12 12 24 57 
Estimated remaining performance obligations are as follows:
Remaining Performance Obligations
(in millions)20212022202320242025ThereafterTotal
Piedmont$50 $67 $64 $61 $60 $335 $637 
Disaggregation of Revenue
Disaggregated revenues are presented as follows:
Three Months Ended March 31, 2021
DukeDukeDukeDukeDuke
(in millions)DukeEnergyProgressEnergyEnergyEnergyEnergy
By market or type of customerEnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Electric Utilities and Infrastructure
   Residential$2,462 $793 $1,162 $560 $602 $195 $313 $— 
   General1,419 502 624 306 318 104 189 — 
   Industrial662 256 207 145 62 31 167 — 
   Wholesale504 114 326 292 34 13 50 — 
   Other revenues226 74 160 83 77 22 18 — 
Total Electric Utilities and Infrastructure revenue from contracts with customers$5,273 $1,739 $2,479 $1,386 $1,093 $365 $737 $— 
Gas Utilities and Infrastructure
   Residential$460 $— $— $— $— $110 $— $351 
   Commercial204 — — — — 48 — 156 
   Industrial50 — — — — 7 — 43 
   Power Generation— — — — — — — 22 
   Other revenues47 — — — — 5 — 26 
Total Gas Utilities and Infrastructure revenue from contracts with customers$761 $— $— $— $— $170 $— $598 
Commercial Renewables
Revenue from contracts with customers$54 $— $— $— $— $— $— $— 
Other
Revenue from contracts with customers$6 $— $— $— $— $— $— $— 
Total revenue from contracts with customers$6,094 $1,739 $2,479 $1,386 $1,093 $535 $737 $598 
Other revenue sources(a)
$56 $(23)$26 $15 $8 $(3)$8 $8 
Total revenues$6,150 $1,716 $2,505 $1,401 $1,101 $532 $745 $606 
(a)    Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.
Three Months Ended March 31, 2020
DukeDukeDukeDukeDuke
(in millions)DukeEnergyProgressEnergyEnergyEnergyEnergy
By market or type of customerEnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Electric Utilities and Infrastructure
   Residential$2,261 $756 $1,064 $502 $562 $176 $265 $— 
   General1,492 549 648 319 329 114 181 — 
   Industrial693 269 216 154 62 35 175 — 
   Wholesale497 114 321 279 42 7 55 — 
   Other revenues191 60 118 63 55 20 16 — 
Total Electric Utilities and Infrastructure revenue from contracts with customers$5,134 $1,748 $2,367 $1,317 $1,050 $352 $692 $— 
Gas Utilities and Infrastructure
   Residential$362 $— $— $— $— $97 $— $264 
   Commercial169 — — — — 43 — 126 
   Industrial41 — — — — 6 — 36 
   Power Generation— — — — — — — 11 
   Other revenues30 — — — — 6 — 24 
Total Gas Utilities and Infrastructure revenue from contracts with customers$602 $— $— $— $— $152 $— $461 
Commercial Renewables
Revenue from contracts with customers$58 $— $— $— $— $— $— $— 
Other
Revenue from contracts with customers$6 $— $— $— $— $— $— $— 
Total revenue from contracts with customers$5,800 $1,748 $2,367 $1,317 $1,050 $504 $692 $461 
Other revenue sources(a)
$149 $— $55 $21 $30 $(6)$— $51 
Total revenues$5,949 $1,748 $2,422 $1,338 $1,080 $498 $692 $512 
(a)    Other revenue sources include revenues from leases, derivatives and alternative revenue programs that are not considered revenues from contracts with customers. Alternative revenue programs in certain jurisdictions include regulatory mechanisms that periodically adjust for over or under collection of related revenues.
Reserve for Credit Losses for Trade and Other Receivables The following table presents the reserve for credit losses for trade and other receivables based on adoption of the new standard.
Three Months Ended March 31, 2020 and 2021
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Balance at December 31, 2019$76 $10 $16 $8 $7 $4 $3 $6 
Cumulative Change in Accounting Principle5 1 2 1 1 — — 1 
Write-Offs(10)(3)(4)(2)(2)— — (1)
Credit Loss Expense18 3 6 2 5 1 — 3 
Balance at March 31, 2020$89 $11 $20 $9 $11 $5 $3 $9 
Balance at December 31, 2020$146 $23 $37 $23 $14 $4 $3 $12 
Write-Offs(21)(8)(10)(5)(5)— — (1)
Credit Loss Expense17 10 7 2 5 — — 3 
Other Adjustments5 9 3 3 1 — — — 
Balance at March 31, 2021$147 $34 $37 $23 $15 $4 $3 $14 
Aging of Trade Receivables
The aging of trade receivables is presented in the table below. Duke Energy considers receivables greater than 30 days outstanding past due.
March 31, 2021
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Unbilled Revenue(a)(b)
$758 $293 $183 $90 $93 $4 $16 $44 
0-30 days1,656 337 633 357 275 55 35 185 
30-60 days181 62 46 31 15 8 3 21 
60-90 days46 15 11 6 5 3 1 6 
90+ days120 31 26 4 22 28 11 7 
Deferred Payment Arrangements(c)
170 80 53 37 16 4 — 8 
Trade and Other Receivables$2,931 $818 $952 $525 $426 $102 $66 $271 
December 31, 2020
DukeDukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaOhioIndianaPiedmont
Unbilled Revenue(a)(b)
$969 $328 $283 $167 $116 $2 $16 $86 
0-30 days1,789 445 707 398 307 60 26 149 
30-60 days185 80 54 25 29 8 3 8 
60-90 days22 1 10 4 6 2 1 3 
90+ days119 16 32 9 23 30 12 9 
Deferred Payment Arrangements(c)
215 96 80 52 28 — — 7 
Trade and Other Receivables$3,299 $966 $1,166 $655 $509 $102 $58 $262 
(a)    Unbilled revenues are recognized by applying customer billing rates to the estimated volumes of energy or natural gas delivered but not yet billed and are included within Receivables and Receivables of VIEs on the Condensed Consolidated Balance Sheets.
(b)    Duke Energy Ohio and Duke Energy Indiana sell, on a revolving basis, nearly all of their retail accounts receivable, including receivables for unbilled revenues, to an affiliate, CRC, and account for the transfers of receivables as sales. Accordingly, the receivables sold are not reflected on the Condensed Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. See Note 11 for further information. These receivables for unbilled revenues are $55 million and $87 million for Duke Energy Ohio and Duke Energy Indiana, respectively, as of March 31, 2021, and $87 million and $134 million for Duke Energy Ohio and Duke Energy Indiana, respectively, as of December 31, 2020.
(c)    Due to certain customer financial hardships created by the COVID-19 pandemic and resulting stay-at-home orders, Duke Energy permitted customers to defer payment of past-due amounts through an installment payment plan over a period of several months.