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Regulatory Matters (Schedule of Regulatory Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets $ 16,313 $ 16,959
Less: Current portion 1,934 2,739
Total noncurrent regulatory assets 14,379 14,220
Total regulatory liabilities 16,953 15,942
Less: Current portion 1,271 1,421
Total noncurrent regulatory liabilities 15,682 14,521
COR regulatory liability    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 5,336 5,302
Net regulatory liability related to income taxes    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 4,748 5,356
AROs – nuclear and other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 2,982 2,289
Deferred nuclear PTC    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 1,377 676
Hedge costs deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 582 583
Renewable energy credits    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 267 241
Accrued pension and OPEB    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 184 232
Deferred fuel and purchased power    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 28 223
Storm cost recovery    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 262 6
DSM/EE    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 26 69
Storm reserve    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 132  
Nuclear insurance distributions reserve    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 163 152
Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 866 813
AROs – coal ash    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 3,670 3,384
Accrued pension and OPEB    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 2,281 2,524
Storm cost deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 73 1,951
Storm cost securitized balance, net    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 2,567 1,023
AROs – nuclear and other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 602 948
Nuclear asset securitized balance, net    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 717 771
Debt fair value adjustment    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 665 719
COR regulatory asset    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 860 646
Deferred fuel and purchased power    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 619 588
Hedge costs deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 365 352
PISCC and deferred operating expenses    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 291 331
Retired generation facilities    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 252 337
Customer connect project    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 234 257
Grid deferral    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 257 255
Incremental COVID-19 expenses    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 202 231
Vacation accrual    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 240 228
Deferred asset – Lee and Harris COLA    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 177 215
Advanced metering infrastructure (AMI)    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 162 204
Demand side management (DSM) / Energy efficiency (EE)    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 335 199
CEP deferral    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 200 195
NCEMPA deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 202 179
Decoupling    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 118 162
Nuclear deferral    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 117 134
Deferred pipeline integrity costs    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 117 129
COR settlement    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 106 110
Derivatives – natural gas supply contracts    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 72 94
Deferred coal ash handling system costs    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 60 77
Qualifying facility contract buyouts    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 55 62
Network Integration Transmission Services deferral    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 31 31
Transmission expansion obligation    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 30 31
East Bend deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 20 24
Propane caverns    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 22 24
Deferred purchased gas costs    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 26 9
Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 568 535
Progress Energy    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 7,403 8,265
Less: Current portion 753 1,647
Total noncurrent regulatory assets 6,650 6,618
Total regulatory liabilities 5,951 5,780
Less: Current portion 350 522
Total noncurrent regulatory liabilities 5,601 5,258
Progress Energy | COR regulatory liability    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 3,084 2,984
Progress Energy | Net regulatory liability related to income taxes    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 1,741 1,882
Progress Energy | Deferred nuclear PTC    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 197 95
Progress Energy | Hedge costs deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 248 281
Progress Energy | Renewable energy credits    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 146 139
Progress Energy | Accrued pension and OPEB    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 11 12
Progress Energy | Deferred fuel and purchased power    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 28 94
Progress Energy | Storm cost recovery    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 90 6
Progress Energy | Storm reserve    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 132  
Progress Energy | Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 274 287
Progress Energy | AROs – coal ash    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 1,544 1,335
Progress Energy | Accrued pension and OPEB    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 744 828
Progress Energy | Storm cost deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 49 1,238
Progress Energy | Storm cost securitized balance, net    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 1,239 822
Progress Energy | AROs – nuclear and other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 564 905
Progress Energy | Nuclear asset securitized balance, net    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 717 771
Progress Energy | COR regulatory asset    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 746 571
Progress Energy | Deferred fuel and purchased power    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 228 282
Progress Energy | Hedge costs deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 135 126
Progress Energy | PISCC and deferred operating expenses    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 37 37
Progress Energy | Retired generation facilities    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 176 202
Progress Energy | Customer connect project    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 107 116
Progress Energy | Grid deferral    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 63 54
Progress Energy | Incremental COVID-19 expenses    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 94 89
Progress Energy | Vacation accrual    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 45 43
Progress Energy | Deferred asset – Lee and Harris COLA    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 4 10
Progress Energy | Advanced metering infrastructure (AMI)    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 48 70
Progress Energy | Demand side management (DSM) / Energy efficiency (EE)    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 247 199
Progress Energy | NCEMPA deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 202 179
Progress Energy | Decoupling    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 27 32
Progress Energy | Nuclear deferral    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 53 53
Progress Energy | COR settlement    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 28 29
Progress Energy | Deferred coal ash handling system costs    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 13 17
Progress Energy | Qualifying facility contract buyouts    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 55 62
Progress Energy | Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 238 195
Duke Energy Carolinas    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 5,232 4,884
Less: Current portion 730 685
Total noncurrent regulatory assets 4,502 4,199
Total regulatory liabilities 8,178 7,210
Less: Current portion 569 618
Total noncurrent regulatory liabilities 7,609 6,592
Duke Energy Carolinas | COR regulatory liability    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 1,383 1,479
Duke Energy Carolinas | Net regulatory liability related to income taxes    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 1,608 1,951
Duke Energy Carolinas | AROs – nuclear and other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 2,982 2,289
Duke Energy Carolinas | Deferred nuclear PTC    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 1,180 581
Duke Energy Carolinas | Hedge costs deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 228 199
Duke Energy Carolinas | Renewable energy credits    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 121 102
Duke Energy Carolinas | Accrued pension and OPEB    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 18 35
Duke Energy Carolinas | Deferred fuel and purchased power    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities   108
Duke Energy Carolinas | Storm cost recovery    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 172  
Duke Energy Carolinas | DSM/EE    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities   53
Duke Energy Carolinas | Nuclear insurance distributions reserve    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 163 152
Duke Energy Carolinas | Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 323 261
Duke Energy Carolinas | AROs – coal ash    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 1,506 1,481
Duke Energy Carolinas | Accrued pension and OPEB    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 592 668
Duke Energy Carolinas | Storm cost deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets   691
Duke Energy Carolinas | Storm cost securitized balance, net    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 1,328 201
Duke Energy Carolinas | Deferred fuel and purchased power    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 306 298
Duke Energy Carolinas | Hedge costs deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 199 202
Duke Energy Carolinas | PISCC and deferred operating expenses    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 39 42
Duke Energy Carolinas | Retired generation facilities    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 56 110
Duke Energy Carolinas | Customer connect project    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 48 54
Duke Energy Carolinas | Grid deferral    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 194 201
Duke Energy Carolinas | Incremental COVID-19 expenses    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 104 137
Duke Energy Carolinas | Vacation accrual    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 91 86
Duke Energy Carolinas | Deferred asset – Lee and Harris COLA    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 173 205
Duke Energy Carolinas | Advanced metering infrastructure (AMI)    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 102 114
Duke Energy Carolinas | Demand side management (DSM) / Energy efficiency (EE)    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 86  
Duke Energy Carolinas | Decoupling    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 45 24
Duke Energy Carolinas | Nuclear deferral    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 64 81
Duke Energy Carolinas | COR settlement    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 78 81
Duke Energy Carolinas | Deferred coal ash handling system costs    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 47 60
Duke Energy Carolinas | Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 174 148
Duke Energy Progress    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 5,195 5,181
Less: Current portion 652 626
Total noncurrent regulatory assets 4,543 4,555
Total regulatory liabilities 5,081 4,918
Less: Current portion 274 348
Total noncurrent regulatory liabilities 4,807 4,570
Duke Energy Progress | COR regulatory liability    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 3,084 2,984
Duke Energy Progress | Net regulatory liability related to income taxes    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 1,206 1,318
Duke Energy Progress | Deferred nuclear PTC    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 197 95
Duke Energy Progress | Hedge costs deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 126 151
Duke Energy Progress | Renewable energy credits    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 146 139
Duke Energy Progress | Accrued pension and OPEB    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 11 12
Duke Energy Progress | Deferred fuel and purchased power    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 10 10
Duke Energy Progress | Storm cost recovery    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 90 6
Duke Energy Progress | Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 211 203
Duke Energy Progress | AROs – coal ash    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 1,531 1,322
Duke Energy Progress | Accrued pension and OPEB    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 396 439
Duke Energy Progress | Storm cost deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 20 276
Duke Energy Progress | Storm cost securitized balance, net    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 1,239 822
Duke Energy Progress | AROs – nuclear and other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 554 900
Duke Energy Progress | Deferred fuel and purchased power    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 227 277
Duke Energy Progress | Hedge costs deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 87 85
Duke Energy Progress | PISCC and deferred operating expenses    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 37 37
Duke Energy Progress | Retired generation facilities    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 87 108
Duke Energy Progress | Customer connect project    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 42 45
Duke Energy Progress | Grid deferral    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 63 54
Duke Energy Progress | Incremental COVID-19 expenses    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 94 89
Duke Energy Progress | Vacation accrual    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 45 43
Duke Energy Progress | Deferred asset – Lee and Harris COLA    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 4 10
Duke Energy Progress | Advanced metering infrastructure (AMI)    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 39 54
Duke Energy Progress | Demand side management (DSM) / Energy efficiency (EE)    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 229 188
Duke Energy Progress | NCEMPA deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 202 179
Duke Energy Progress | Decoupling    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 27 32
Duke Energy Progress | Nuclear deferral    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 53 53
Duke Energy Progress | COR settlement    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 28 29
Duke Energy Progress | Deferred coal ash handling system costs    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 13 17
Duke Energy Progress | Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 178 122
Duke Energy Florida    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 2,208 3,086
Less: Current portion 102 1,022
Total noncurrent regulatory assets 2,106 2,064
Total regulatory liabilities 870 862
Less: Current portion 76 174
Total noncurrent regulatory liabilities 794 688
Duke Energy Florida | Net regulatory liability related to income taxes    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 535 564
Duke Energy Florida | Hedge costs deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 122 130
Duke Energy Florida | Deferred fuel and purchased power    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 18 84
Duke Energy Florida | Storm reserve    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 132  
Duke Energy Florida | Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 63 84
Duke Energy Florida | AROs – coal ash    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 13 13
Duke Energy Florida | Accrued pension and OPEB    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 348 389
Duke Energy Florida | Storm cost deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 29 962
Duke Energy Florida | AROs – nuclear and other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 10 5
Duke Energy Florida | Nuclear asset securitized balance, net    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 717 771
Duke Energy Florida | COR regulatory asset    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 746 571
Duke Energy Florida | Hedge costs deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 48 41
Duke Energy Florida | Retired generation facilities    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 89 94
Duke Energy Florida | Customer connect project    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 65 71
Duke Energy Florida | Advanced metering infrastructure (AMI)    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 9 16
Duke Energy Florida | Qualifying facility contract buyouts    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 55 62
Duke Energy Florida | Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 79 91
Duke Energy Ohio    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 772 793
Less: Current portion 86 88
Total noncurrent regulatory assets 686 705
Total regulatory liabilities 527 499
Less: Current portion 57 34
Total noncurrent regulatory liabilities 470 465
Duke Energy Ohio | Net regulatory liability related to income taxes    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 405 432
Duke Energy Ohio | Accrued pension and OPEB    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 13 14
Duke Energy Ohio | Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 109 53
Duke Energy Ohio | AROs – coal ash    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 14 14
Duke Energy Ohio | Accrued pension and OPEB    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 121 131
Duke Energy Ohio | COR regulatory asset    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 114 75
Duke Energy Ohio | Deferred fuel and purchased power    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 25 8
Duke Energy Ohio | PISCC and deferred operating expenses    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 14 15
Duke Energy Ohio | Customer connect project    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 39 44
Duke Energy Ohio | CEP deferral    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 200 195
Duke Energy Ohio | Decoupling    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 18 29
Duke Energy Ohio | Deferred pipeline integrity costs    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 26 28
Duke Energy Ohio | Network Integration Transmission Services deferral    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 31 31
Duke Energy Ohio | Transmission expansion obligation    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 30 31
Duke Energy Ohio | East Bend deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 20 24
Duke Energy Ohio | Propane caverns    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 22 24
Duke Energy Ohio | Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 98 144
Duke Energy Indiana    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 1,225 1,153
Less: Current portion 193 113
Total noncurrent regulatory assets 1,032 1,040
Total regulatory liabilities 1,460 1,587
Less: Current portion 275 183
Total noncurrent regulatory liabilities 1,185 1,404
Duke Energy Indiana | COR regulatory liability    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 444 434
Duke Energy Indiana | Net regulatory liability related to income taxes    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 641 725
Duke Energy Indiana | Hedge costs deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 106 103
Duke Energy Indiana | Accrued pension and OPEB    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 113 139
Duke Energy Indiana | Deferred fuel and purchased power    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities   21
Duke Energy Indiana | DSM/EE    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 19 11
Duke Energy Indiana | Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 137 154
Duke Energy Indiana | AROs – coal ash    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 606 554
Duke Energy Indiana | Accrued pension and OPEB    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 203 212
Duke Energy Indiana | Storm cost deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 21 17
Duke Energy Indiana | Deferred fuel and purchased power    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 60  
Duke Energy Indiana | Hedge costs deferrals    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 30 23
Duke Energy Indiana | PISCC and deferred operating expenses    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 201 237
Duke Energy Indiana | Retired generation facilities    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 20 25
Duke Energy Indiana | Customer connect project    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 18 19
Duke Energy Indiana | Advanced metering infrastructure (AMI)    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 10 12
Duke Energy Indiana | Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 56 54
Piedmont    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 456 528
Less: Current portion 106 141
Total noncurrent regulatory assets 350 387
Total regulatory liabilities 822 847
Less: Current portion 20 64
Total noncurrent regulatory liabilities 802 783
Piedmont | COR regulatory liability    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 425 405
Piedmont | Net regulatory liability related to income taxes    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 353 366
Piedmont | Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory liabilities 44 76
Piedmont | Accrued pension and OPEB    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 131 144
Piedmont | AROs – nuclear and other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 25 25
Piedmont | Customer connect project    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 22 24
Piedmont | Vacation accrual    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 15 14
Piedmont | Decoupling    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 28 77
Piedmont | Deferred pipeline integrity costs    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 91 101
Piedmont | Derivatives – natural gas supply contracts    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 72 94
Piedmont | Deferred purchased gas costs    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 26 9
Piedmont | Other    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets 19 26
Piedmont | Pipeline Integrity Management – Transmission/Distribution    
Regulatory Assets Liabilities [Line Items]    
Total regulatory assets $ 27 $ 14