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Regulatory Matters (Schedule of Regulatory Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | $ 15,018 | $ 15,622
Regulatory Assets: Current | 1,796 | 2,005
Other Noncurrent Assets: Regulatory assets | 13,222 | 13,617
Total regulatory liabilities | 16,048 | 15,432
Less: current portion | 784 | 598
Total noncurrent regulatory liabilities | 15,264 | 14,834
Net regulatory liability related to income taxes |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 7,872 | 8,058
Costs of removal |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 5,756 | 5,421
AROs – nuclear and other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 1,100 | 538
Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 176 | 301
Amounts to be refunded to customers |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 34 | 34
Deferred fuel and purchased power |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 1 | 16
Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 1,109 | 1,064
AROs – coal ash |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 4,084 | 4,255
AROs – nuclear and other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 739 | 772
Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 2,391 | 2,654
Storm cost deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 1,399 | 1,117
Nuclear asset securitized balance, net |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 1,042 | 1,093
Debt fair value adjustment |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 1,019 | 1,099
Deferred fuel and purchased power |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 528 | 838
Deferred asset – Lee and Harris COLA |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 388 | 426
Hedge costs deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 356 | 204
Demand side management (DSM)/Energy Efficiency (EE) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 343 | 449
Advanced metering infrastructure (AMI) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 338 | 367
Retired generation facilities |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 331 | 402
Post-in-service carrying costs (PISCC) and deferred operating expenses |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 329 | 320
Vacation accrual |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 214 | 213
Derivatives – natural gas supply contracts |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 117 | 141
Nuclear deferral |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 107 | 133
Manufactured gas plant (MGP) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 102 | 99
Deferred pipeline integrity costs |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 79 | 65
NCEMPA deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 72 | 50
East Bend deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 44 | 47
Transmission expansion obligation |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 36 | 39
Amounts due from customers |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 36 | 24
Grid Modernization [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 28 | 31
Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 896 | 784
Progress Energy |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 7,292 | 7,701
Regulatory Assets: Current | 946 | 1,137
Other Noncurrent Assets: Regulatory assets | 6,346 | 6,564
Total regulatory liabilities | 5,555 | 5,329
Less: current portion | 330 | 280
Total noncurrent regulatory liabilities | 5,225 | 5,049
Progress Energy | Net regulatory liability related to income taxes |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 2,595 | 2,710
Progress Energy | Costs of removal |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 2,561 | 2,135
Progress Energy | Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities |  | 149
Progress Energy | Deferred fuel and purchased power |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 1 | 16
Progress Energy | Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 398 | 319
Progress Energy | AROs – coal ash |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 1,843 | 2,061
Progress Energy | AROs – nuclear and other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 668 | 601
Progress Energy | Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 897 | 1,074
Progress Energy | Storm cost deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 1,214 | 953
Progress Energy | Nuclear asset securitized balance, net |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 1,042 | 1,093
Progress Energy | Deferred fuel and purchased power |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 305 | 600
Progress Energy | Deferred asset – Lee and Harris COLA |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 38 | 43
Progress Energy | Hedge costs deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 129 | 74
Progress Energy | Demand side management (DSM)/Energy Efficiency (EE) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 241 | 256
Progress Energy | Advanced metering infrastructure (AMI) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 114 | 127
Progress Energy | Retired generation facilities |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 266 | 324
Progress Energy | Post-in-service carrying costs (PISCC) and deferred operating expenses |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 33 | 36
Progress Energy | Vacation accrual |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 41 | 41
Progress Energy | Nuclear deferral |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 40 | 46
Progress Energy | NCEMPA deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 72 | 50
Progress Energy | Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 349 | 322
Duke Energy Carolinas |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 3,910 | 3,977
Regulatory Assets: Current | 550 | 520
Other Noncurrent Assets: Regulatory assets | 3,360 | 3,457
Total regulatory liabilities | 6,678 | 6,198
Less: current portion | 255 | 199
Total noncurrent regulatory liabilities | 6,423 | 5,999
Duke Energy Carolinas | Net regulatory liability related to income taxes |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 3,060 | 3,082
Duke Energy Carolinas | Costs of removal |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 1,936 | 1,968
Duke Energy Carolinas | AROs – nuclear and other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 1,100 | 538
Duke Energy Carolinas | Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 39 | 38
Duke Energy Carolinas | Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 543 | 572
Duke Energy Carolinas | AROs – coal ash |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 1,696 | 1,725
Duke Energy Carolinas | Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 477 | 581
Duke Energy Carolinas | Storm cost deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 178 | 160
Duke Energy Carolinas | Deferred fuel and purchased power |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 222 | 196
Duke Energy Carolinas | Deferred asset – Lee and Harris COLA |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 350 | 383
Duke Energy Carolinas | Hedge costs deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 198 | 101
Duke Energy Carolinas | Demand side management (DSM)/Energy Efficiency (EE) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 100 | 169
Duke Energy Carolinas | Advanced metering infrastructure (AMI) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 166 | 176
Duke Energy Carolinas | Retired generation facilities |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 16 | 21
Duke Energy Carolinas | Post-in-service carrying costs (PISCC) and deferred operating expenses |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 33 | 34
Duke Energy Carolinas | Vacation accrual |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 80 | 78
Duke Energy Carolinas | Nuclear deferral |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 67 | 87
Duke Energy Carolinas | Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 327 | 266
Duke Energy Progress |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 4,678 | 4,814
Regulatory Assets: Current | 526 | 703
Other Noncurrent Assets: Regulatory assets | 4,152 | 4,111
Total regulatory liabilities | 4,468 | 4,133
Less: current portion | 236 | 178
Total noncurrent regulatory liabilities | 4,232 | 3,955
Duke Energy Progress | Net regulatory liability related to income taxes |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 1,802 | 1,863
Duke Energy Progress | Costs of removal |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 2,294 | 1,878
Duke Energy Progress | Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities |  | 93
Duke Energy Progress | Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 372 | 299
Duke Energy Progress | AROs – coal ash |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 1,834 | 2,051
Duke Energy Progress | AROs – nuclear and other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 509 | 429
Duke Energy Progress | Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 423 | 542
Duke Energy Progress | Storm cost deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 801 | 571
Duke Energy Progress | Deferred fuel and purchased power |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 266 | 397
Duke Energy Progress | Deferred asset – Lee and Harris COLA |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 38 | 43
Duke Energy Progress | Hedge costs deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 85 | 54
Duke Energy Progress | Demand side management (DSM)/Energy Efficiency (EE) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 216 | 235
Duke Energy Progress | Advanced metering infrastructure (AMI) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 61 | 67
Duke Energy Progress | Retired generation facilities |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 83 | 105
Duke Energy Progress | Post-in-service carrying costs (PISCC) and deferred operating expenses |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 33 | 36
Duke Energy Progress | Vacation accrual |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 41 | 41
Duke Energy Progress | Nuclear deferral |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 40 | 46
Duke Energy Progress | NCEMPA deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 72 | 50
Duke Energy Progress | Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 176 | 147
Duke Energy Florida |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 2,613 | 2,888
Regulatory Assets: Current | 419 | 434
Other Noncurrent Assets: Regulatory assets | 2,194 | 2,454
Total regulatory liabilities | 1,087 | 1,196
Less: current portion | 94 | 102
Total noncurrent regulatory liabilities | 993 | 1,094
Duke Energy Florida | Net regulatory liability related to income taxes |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 793 | 847
Duke Energy Florida | Costs of removal |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 267 | 257
Duke Energy Florida | Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities |  | 56
Duke Energy Florida | Deferred fuel and purchased power |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 1 | 16
Duke Energy Florida | Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 26 | 20
Duke Energy Florida | AROs – coal ash |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 9 | 10
Duke Energy Florida | AROs – nuclear and other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 159 | 172
Duke Energy Florida | Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 474 | 532
Duke Energy Florida | Storm cost deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 413 | 382
Duke Energy Florida | Nuclear asset securitized balance, net |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 1,042 | 1,093
Duke Energy Florida | Deferred fuel and purchased power |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 39 | 203
Duke Energy Florida | Hedge costs deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 44 | 20
Duke Energy Florida | Demand side management (DSM)/Energy Efficiency (EE) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 25 | 21
Duke Energy Florida | Advanced metering infrastructure (AMI) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 53 | 60
Duke Energy Florida | Retired generation facilities |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 183 | 219
Duke Energy Florida | Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 172 | 176
Duke Energy Ohio |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 598 | 564
Regulatory Assets: Current | 49 | 33
Other Noncurrent Assets: Regulatory assets | 549 | 531
Total regulatory liabilities | 827 | 897
Less: current portion | 64 | 57
Total noncurrent regulatory liabilities | 763 | 840
Duke Energy Ohio | Net regulatory liability related to income taxes |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 654 | 678
Duke Energy Ohio | Costs of removal |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 86 | 126
Duke Energy Ohio | Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 16 | 18
Duke Energy Ohio | Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 71 | 75
Duke Energy Ohio | AROs – coal ash |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 16 | 20
Duke Energy Ohio | Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 155 | 146
Duke Energy Ohio | Storm cost deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 7 | 4
Duke Energy Ohio | Deferred fuel and purchased power |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 1 | 2
Duke Energy Ohio | Hedge costs deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 6 | 5
Duke Energy Ohio | Demand side management (DSM)/Energy Efficiency (EE) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 2 | 10
Duke Energy Ohio | Advanced metering infrastructure (AMI) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 40 | 46
Duke Energy Ohio | Post-in-service carrying costs (PISCC) and deferred operating expenses |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 17 | 17
Duke Energy Ohio | Vacation accrual |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 5 | 5
Duke Energy Ohio | Manufactured gas plant (MGP) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 102 | 99
Duke Energy Ohio | Deferred pipeline integrity costs |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 17 | 14
Duke Energy Ohio | East Bend deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 44 | 47
Duke Energy Ohio | Transmission expansion obligation |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 40 | 43
Duke Energy Ohio | Grid Modernization [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 28 | 31
Duke Energy Ohio | Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 118 | 75
Duke Energy Indiana |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 1,172 | 1,157
Regulatory Assets: Current | 90 | 175
Other Noncurrent Assets: Regulatory assets | 1,082 | 982
Total regulatory liabilities | 1,740 | 1,747
Less: current portion | 55 | 25
Total noncurrent regulatory liabilities | 1,685 | 1,722
Duke Energy Indiana | Net regulatory liability related to income taxes |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 1,008 | 1,009
Duke Energy Indiana | Costs of removal |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 599 | 628
Duke Energy Indiana | Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 90 | 67
Duke Energy Indiana | Amounts to be refunded to customers |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities |  | 1
Duke Energy Indiana | Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 43 | 42
Duke Energy Indiana | AROs – coal ash |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 529 | 450
Duke Energy Indiana | Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 243 | 222
Duke Energy Indiana | Deferred fuel and purchased power |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets |  | 40
Duke Energy Indiana | Hedge costs deferrals |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 23 | 24
Duke Energy Indiana | Demand side management (DSM)/Energy Efficiency (EE) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets |  | 14
Duke Energy Indiana | Advanced metering infrastructure (AMI) |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 18 | 18
Duke Energy Indiana | Retired generation facilities |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 49 | 57
Duke Energy Indiana | Post-in-service carrying costs (PISCC) and deferred operating expenses |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 246 | 233
Duke Energy Indiana | Vacation accrual |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 12 | 11
Duke Energy Indiana | Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 52 | 88
Piedmont |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 363 | 357
Regulatory Assets: Current | 73 | 54
Other Noncurrent Assets: Regulatory assets | 290 | 303
Total regulatory liabilities | 1,212 | 1,218
Less: current portion | 81 | 37
Total noncurrent regulatory liabilities | 1,131 | 1,181
Piedmont | Net regulatory liability related to income taxes |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 555 | 579
Piedmont | Costs of removal |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 574 | 564
Piedmont | Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 3 | 1
Piedmont | Amounts to be refunded to customers |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 34 | 33
Piedmont | Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory liabilities | 46 | 41
Piedmont | AROs – nuclear and other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 16 | 19
Piedmont | Accrued pension and OPEB |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 90 | 99
Piedmont | Vacation accrual |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 12 | 12
Piedmont | Derivatives – natural gas supply contracts |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 117 | 141
Piedmont | Deferred pipeline integrity costs |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 62 | 51
Piedmont | Amounts due from customers |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | 36 | 24
Piedmont | Other |  |
Regulatory Assets Liabilities [Line Items] |  |
Total regulatory assets | $ 30 | $ 11

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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