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v3.10.0.1

Regulatory Matters (Schedule of Regulatory Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | $ 15,622 | $ 13,879
Regulatory Assets, Current | 2,005 | 1,437
Regulatory assets, noncurrent | 13,617 | 12,442
Regulatory Liabilities | 15,432 | 15,732
Regulatory Liability, Current | 598 | 402
Regulatory Liability, Noncurrent | 14,834 | 15,330
Costs of Removal [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 5,421 | 5,968
Asset retirement obligations - nuclear and other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 538 | 806
Net regulatory liability related to income taxes [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 8,058 | 8,113
Amounts To Be Refunded to Customers [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 34 | 10
Storm cost deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities |  | 20
Accrued Pension And OPEB [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 301 | 146
Deferred Fuel and Purchased Power [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 16 | 47
Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 1,064 | 622
Deferred Asset - Lee COLA [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 383 |
Asset retirement obligations - coal ash [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 4,255 | 4,025
Asset retirement obligations - nuclear and other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 772 | 852
Accrued Pension And Post Retirement [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 2,654 | 2,249
Retired Generation Facilities [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 445 | 480
Debt Fair Value Adjustment [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 1,099 | 1,197
Storm cost deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 1,117 | 531
Nuclear asset securitized balance, net [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 1,093 | 1,142
Hedge costs deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 204 | 234
Derivatives - natural gas supply contracts [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 141 | 142
Demand Side Management And Energy Efficiency, Asset [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 449 | 530
Grid Modernization [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 31 | 39
Vacation accrual [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 213 | 213
Deferred Fuel and Purchased Power [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 838 | 507
Nuclear Deferral [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 133 | 119
Post In Service Carrying Costs And Deferred Operating Expense [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 320 | 366
Transmission Expansion Obligation [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 39 | 46
Manufactured Gas Plant [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 99 | 91
Advanced Metering Infrastructure [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 367 | 362
NCEMPA deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 50 | 53
East Bend deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 47 | 45
Deferred pipeline integrity [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 65 | 54
Amounts due from customers [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 24 | 64
Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 784 | 538
Duke Energy Carolinas [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 3,977 | 3,152
Regulatory Assets, Current | 520 | 299
Regulatory assets, noncurrent | 3,457 | 2,853
Regulatory Liabilities | 6,198 | 6,357
Regulatory Liability, Current | 199 | 126
Regulatory Liability, Noncurrent | 5,999 | 6,231
Duke Energy Carolinas [Member] | Costs of Removal [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 1,968 | 2,054
Duke Energy Carolinas [Member] | Asset retirement obligations - nuclear and other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 538 | 806
Duke Energy Carolinas [Member] | Net regulatory liability related to income taxes [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 3,082 | 3,028
Duke Energy Carolinas [Member] | Storm cost deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities |  | 20
Duke Energy Carolinas [Member] | Accrued Pension And OPEB [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 38 | 44
Duke Energy Carolinas [Member] | Deferred Fuel and Purchased Power [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities |  | 46
Duke Energy Carolinas [Member] | Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 572 | 359
Duke Energy Carolinas [Member] | Deferred Asset - Lee COLA [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 383 |
Duke Energy Carolinas [Member] | Asset retirement obligations - coal ash [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 1,725 | 1,645
Duke Energy Carolinas [Member] | Accrued Pension And Post Retirement [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 581 | 410
Duke Energy Carolinas [Member] | Retired Generation Facilities [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 21 | 29
Duke Energy Carolinas [Member] | Storm cost deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 160 |
Duke Energy Carolinas [Member] | Hedge costs deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 101 | 109
Duke Energy Carolinas [Member] | Demand Side Management And Energy Efficiency, Asset [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 169 | 210
Duke Energy Carolinas [Member] | Vacation accrual [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 78 | 83
Duke Energy Carolinas [Member] | Deferred Fuel and Purchased Power [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 196 | 140
Duke Energy Carolinas [Member] | Nuclear Deferral [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 87 | 84
Duke Energy Carolinas [Member] | Post In Service Carrying Costs And Deferred Operating Expense [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 34 | 35
Duke Energy Carolinas [Member] | Advanced Metering Infrastructure [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 176 | 185
Duke Energy Carolinas [Member] | Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 266 | 222
Progress Energy [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 7,701 | 6,751
Regulatory Assets, Current | 1,137 | 741
Regulatory assets, noncurrent | 6,564 | 6,010
Regulatory Liabilities | 5,329 | 5,519
Regulatory Liability, Current | 280 | 213
Regulatory Liability, Noncurrent | 5,049 | 5,306
Progress Energy [Member] | Costs of Removal [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 2,135 | 2,537
Progress Energy [Member] | Net regulatory liability related to income taxes [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 2,710 | 2,802
Progress Energy [Member] | Accrued Pension And OPEB [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 149 |
Progress Energy [Member] | Deferred Fuel and Purchased Power [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 16 | 1
Progress Energy [Member] | Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 319 | 179
Progress Energy [Member] | Asset retirement obligations - coal ash [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 2,061 | 1,984
Progress Energy [Member] | Asset retirement obligations - nuclear and other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 601 | 655
Progress Energy [Member] | Accrued Pension And Post Retirement [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 1,074 | 906
Progress Energy [Member] | Retired Generation Facilities [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 367 | 386
Progress Energy [Member] | Storm cost deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 953 | 526
Progress Energy [Member] | Nuclear asset securitized balance, net [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 1,093 | 1,142
Progress Energy [Member] | Hedge costs deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 74 | 94
Progress Energy [Member] | Demand Side Management And Energy Efficiency, Asset [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 256 | 281
Progress Energy [Member] | Vacation accrual [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 41 | 42
Progress Energy [Member] | Deferred Fuel and Purchased Power [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 600 | 349
Progress Energy [Member] | Nuclear Deferral [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 46 | 35
Progress Energy [Member] | Post In Service Carrying Costs And Deferred Operating Expense [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 36 | 38
Progress Energy [Member] | Advanced Metering Infrastructure [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 127 | 150
Progress Energy [Member] | NCEMPA deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 50 | 53
Progress Energy [Member] | Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 322 | 110
Duke Energy Progress [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 4,814 | 3,859
Regulatory Assets, Current | 703 | 352
Regulatory assets, noncurrent | 4,111 | 3,507
Regulatory Liabilities | 4,133 | 4,138
Regulatory Liability, Current | 178 | 139
Regulatory Liability, Noncurrent | 3,955 | 3,999
Duke Energy Progress [Member] | Costs of Removal [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 1,878 | 2,122
Duke Energy Progress [Member] | Net regulatory liability related to income taxes [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 1,863 | 1,854
Duke Energy Progress [Member] | Accrued Pension And OPEB [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 93 |
Duke Energy Progress [Member] | Deferred Fuel and Purchased Power [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities |  | 1
Duke Energy Progress [Member] | Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 299 | 161
Duke Energy Progress [Member] | Asset retirement obligations - coal ash [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 2,051 | 1,975
Duke Energy Progress [Member] | Asset retirement obligations - nuclear and other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 429 | 359
Duke Energy Progress [Member] | Accrued Pension And Post Retirement [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 542 | 430
Duke Energy Progress [Member] | Retired Generation Facilities [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 148 | 170
Duke Energy Progress [Member] | Storm cost deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 571 | 150
Duke Energy Progress [Member] | Hedge costs deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 54 | 64
Duke Energy Progress [Member] | Demand Side Management And Energy Efficiency, Asset [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 235 | 264
Duke Energy Progress [Member] | Vacation accrual [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 41 | 42
Duke Energy Progress [Member] | Deferred Fuel and Purchased Power [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 397 | 130
Duke Energy Progress [Member] | Nuclear Deferral [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 46 | 35
Duke Energy Progress [Member] | Post In Service Carrying Costs And Deferred Operating Expense [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 36 | 38
Duke Energy Progress [Member] | Advanced Metering Infrastructure [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 67 | 75
Duke Energy Progress [Member] | NCEMPA deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 50 | 53
Duke Energy Progress [Member] | Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 147 | 74
Duke Energy Florida [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 2,888 | 2,892
Regulatory Assets, Current | 434 | 389
Regulatory assets, noncurrent | 2,454 | 2,503
Regulatory Liabilities | 1,196 | 1,381
Regulatory Liability, Current | 102 | 74
Regulatory Liability, Noncurrent | 1,094 | 1,307
Duke Energy Florida [Member] | Costs of Removal [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 257 | 415
Duke Energy Florida [Member] | Net regulatory liability related to income taxes [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 847 | 948
Duke Energy Florida [Member] | Accrued Pension And OPEB [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 56 |
Duke Energy Florida [Member] | Deferred Fuel and Purchased Power [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 16 |
Duke Energy Florida [Member] | Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 20 | 18
Duke Energy Florida [Member] | Asset retirement obligations - coal ash [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 10 | 9
Duke Energy Florida [Member] | Asset retirement obligations - nuclear and other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 172 | 296
Duke Energy Florida [Member] | Accrued Pension And Post Retirement [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 532 | 476
Duke Energy Florida [Member] | Retired Generation Facilities [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 219 | 216
Duke Energy Florida [Member] | Storm cost deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 382 | 376
Duke Energy Florida [Member] | Nuclear asset securitized balance, net [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 1,093 | 1,142
Duke Energy Florida [Member] | Hedge costs deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 20 | 30
Duke Energy Florida [Member] | Demand Side Management And Energy Efficiency, Asset [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 21 | 17
Duke Energy Florida [Member] | Deferred Fuel and Purchased Power [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 203 | 219
Duke Energy Florida [Member] | Advanced Metering Infrastructure [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 60 | 75
Duke Energy Florida [Member] | Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 176 | 36
Duke Energy Ohio [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 564 | 494
Regulatory Assets, Current | 33 | 49
Regulatory assets, noncurrent | 531 | 445
Regulatory Liabilities | 897 | 927
Regulatory Liability, Current | 57 | 36
Regulatory Liability, Noncurrent | 840 | 891
Duke Energy Ohio [Member] | Costs of Removal [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 126 | 189
Duke Energy Ohio [Member] | Net regulatory liability related to income taxes [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 678 | 688
Duke Energy Ohio [Member] | Accrued Pension And OPEB [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 18 | 16
Duke Energy Ohio [Member] | Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 75 | 34
Duke Energy Ohio [Member] | Asset retirement obligations - coal ash [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 20 | 17
Duke Energy Ohio [Member] | Accrued Pension And Post Retirement [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 146 | 139
Duke Energy Ohio [Member] | Storm cost deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 4 | 5
Duke Energy Ohio [Member] | Hedge costs deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 5 | 6
Duke Energy Ohio [Member] | Demand Side Management And Energy Efficiency, Asset [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 10 | 18
Duke Energy Ohio [Member] | Grid Modernization [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 31 | 39
Duke Energy Ohio [Member] | Vacation accrual [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 5 | 5
Duke Energy Ohio [Member] | Deferred Fuel and Purchased Power [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 2 |
Duke Energy Ohio [Member] | Post In Service Carrying Costs And Deferred Operating Expense [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 17 | 19
Duke Energy Ohio [Member] | Transmission Expansion Obligation [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 43 | 50
Duke Energy Ohio [Member] | Manufactured Gas Plant [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 99 | 91
Duke Energy Ohio [Member] | Advanced Metering Infrastructure [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 46 | 6
Duke Energy Ohio [Member] | East Bend deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 47 | 45
Duke Energy Ohio [Member] | Deferred pipeline integrity [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 14 | 12
Duke Energy Ohio [Member] | Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 75 | 42
Duke Energy Indiana [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 1,157 | 1,143
Regulatory Assets, Current | 175 | 165
Regulatory assets, noncurrent | 982 | 978
Regulatory Liabilities | 1,747 | 1,747
Regulatory Liability, Current | 25 | 24
Regulatory Liability, Noncurrent | 1,722 | 1,723
Duke Energy Indiana [Member] | Costs of Removal [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 628 | 644
Duke Energy Indiana [Member] | Net regulatory liability related to income taxes [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 1,009 | 998
Duke Energy Indiana [Member] | Amounts To Be Refunded to Customers [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 1 | 10
Duke Energy Indiana [Member] | Accrued Pension And OPEB [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 67 | 64
Duke Energy Indiana [Member] | Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 42 | 31
Duke Energy Indiana [Member] | Asset retirement obligations - coal ash [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 450 | 380
Duke Energy Indiana [Member] | Accrued Pension And Post Retirement [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 222 | 197
Duke Energy Indiana [Member] | Retired Generation Facilities [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 57 | 65
Duke Energy Indiana [Member] | Hedge costs deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 24 | 25
Duke Energy Indiana [Member] | Demand Side Management And Energy Efficiency, Asset [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 14 | 21
Duke Energy Indiana [Member] | Vacation accrual [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 11 | 11
Duke Energy Indiana [Member] | Deferred Fuel and Purchased Power [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 40 | 18
Duke Energy Indiana [Member] | Post In Service Carrying Costs And Deferred Operating Expense [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 233 | 274
Duke Energy Indiana [Member] | Advanced Metering Infrastructure [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 18 | 21
Duke Energy Indiana [Member] | Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 88 | 131
Piedmont Natural Gas [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 357 | 378
Regulatory Assets, Current | 54 | 95
Regulatory assets, noncurrent | 303 | 283
Regulatory Liabilities | 1,218 | 1,144
Regulatory Liability, Current | 37 | 3
Regulatory Liability, Noncurrent | 1,181 | 1,141
Piedmont Natural Gas [Member] | Costs of Removal [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 564 | 544
Piedmont Natural Gas [Member] | Net regulatory liability related to income taxes [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 579 | 597
Piedmont Natural Gas [Member] | Amounts To Be Refunded to Customers [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 33 |
Piedmont Natural Gas [Member] | Accrued Pension And OPEB [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 1 |
Piedmont Natural Gas [Member] | Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory Liabilities | 41 | 3
Piedmont Natural Gas [Member] | Asset retirement obligations - nuclear and other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 19 | 15
Piedmont Natural Gas [Member] | Accrued Pension And Post Retirement [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 99 | 91
Piedmont Natural Gas [Member] | Derivatives - natural gas supply contracts [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 141 | 142
Piedmont Natural Gas [Member] | Vacation accrual [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 12 | 10
Piedmont Natural Gas [Member] | Deferred pipeline integrity [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 51 | 42
Piedmont Natural Gas [Member] | Amounts due from customers [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 24 | 64
Piedmont Natural Gas [Member] | Other [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | 11 | $ 14
Hurricane Michael Storm Damage [Member] | Duke Energy Florida [Member] | Storm cost deferrals [Member] |  |
Regulatory Assets Liabilities [Line Items] |  |
Regulatory assets | $ 165 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + 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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