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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurement Amounts For Assets And Liabilities | The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets. Derivative amounts in the tables below for all Duke Energy Registrants exclude cash collateral, which is disclosed in Note 14. See Note 15 for additional information related to investments by major security type for the Duke Energy Registrants.
| December 31, 2020
(in millions) | Total Fair Value | Level 1 | Level 2 | Level 3 | Not Categorized
NDTF cash and cash equivalents | $ | 177 |  | $ | 177 |  | $ | — |  | $ | — |  | $ | — |
NDTF equity securities | 6,235 |  | 6,189 |  | — |  | — |  | 46 |
NDTF debt securities | 2,717 |  | 874 |  | 1,843 |  | — |  | — |
Other equity securities | 146 |  | 146 |  | — |  | — |  | — |
Other debt securities | 285 |  | 37 |  | 248 |  | — |  | — |
Other cash and cash equivalents | 127 |  | 127 |  | — |  | — |  | — |
Derivative assets | 61 |  | 1 |  | 53 |  | 7 |  | — |
Total assets | 9,748 |  | 7,551 |  | 2,144 |  | 7 |  | 46 |
Derivative liabilities | (324) |  | — |  | (240) |  | (84) |  | — |
Net assets (liabilities) | $ | 9,424 |  | $ | 7,551 |  | $ | 1,904 |  | $ | (77) |  | $ | 46 |
| December 31, 2019
(in millions) | Total Fair Value | Level 1 | Level 2 | Level 3 | Not Categorized
NDTF cash and cash equivalents | $ | 101 |  | $ | 101 |  | $ | — |  | $ | — |  | $ | — |
NDTF equity securities | 5,684 |  | 5,633 |  | — |  | — |  | 51 |
NDTF debt securities | 2,368 |  | 725 |  | 1,643 |  | — |  | — |
Other equity securities | 122 |  | 122 |  | — |  | — |  | — |
Other debt securities | 258 |  | 39 |  | 219 |  | — |  | — |
Other cash and cash equivalents | 52 |  | 52 |  | — |  | — |  | — |
Derivative assets | 25 |  | 3 |  | 7 |  | 15 |  | — |
Total assets | 8,610 |  | 6,675 |  | 1,869 |  | 15 |  | 51 |
NDTF equity security contracts | (23) |  | — |  | (23) |  | — |  | — |
Derivative liabilities | (277) |  | (15) |  | (145) |  | (117) |  | — |
Net assets (liabilities) | $ | 8,310 |  | $ | 6,660 |  | $ | 1,701 |  | $ | (102) |  | $ | 51 |
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs | The following table provides reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.
|  |  | Derivatives (net) |  |
|  |  | Years Ended December 31, |  |
(in millions) |  |  | 2020 |  |  |  |  |  | 2019 |  |
Balance at beginning of period |  |  | $ | (102) |  |  |  |  |  |  | $ | (113) |  |  |
Total pretax realized or unrealized losses included in comprehensive income |  |  | (84) |  |  |  |  |  |  | — |  |  |
Purchases, sales, issuances and settlements: |  |  |  |  |  |  |  |  |  |  |
Purchases |  |  | 14 |  |  |  |  |  |  | 37 |  |  |
Settlements |  |  | (19) |  |  |  |  |  |  | (44) |  |  |
Net transfers Out of Level 3(a) |  |  | 117 |  |  |  |  |  |  | — |  |  |
Total (losses) gains included on the Consolidated Balance Sheet |  |  | (3) |  |  |  |  |  |  | 18 |  |  |
Balance at end of period |  |  | $ | (77) |  |  |  |  |  |  | $ | (102) |  |  |
(a) Transferred from Level 3 to Level 2 because observable market data became available.
Quantitative Information Table - Level 3 | The following tables include quantitative information about the Duke Energy Registrants' derivatives classified as Level 3.
| December 31, 2020 |
|  |  |  |  |  |  | Weighted
| Fair Value |  |  |  |  |  | Average
Investment Type | (in millions) | Valuation Technique | Unobservable Input | Range | Range
Duke Energy |  |  |  |  |  |  |
Electricity contracts | $ | (84) |  | Discounted cash flow | Forward electricity curves – price per MWh | $ | 14.68 |  | – | $ | 151.84 |  | $ | 28.84 |
Duke Energy Ohio |  |  |  |  |  |  |
FTRs | 1 |  | RTO auction pricing | FTR price – per MWh | 0.25 |  | – | 1.68 |  | 0.79 |
Duke Energy Indiana |  |  |  |  |  |  |
FTRs | 6 |  | RTO auction pricing | FTR price – per MWh | (2.40) |  | – | 7.41 |  | 1.05 |
Duke Energy |  |  |  |  |  |  |
Total Level 3 derivatives | $ | (77) |  |  |  |  |  |  |
| December 31, 2019 |
|  |  |  |  |  |  | Weighted
| Fair Value |  |  |  |  |  | Average
Investment Type | (in millions) | Valuation Technique | Unobservable Input | Range | Range
Duke Energy Ohio |  |  |  |  |  |  |
FTRs | $ | 4 |  | RTO auction pricing | FTR price – per MWh | $ | 0.59 |  | – | $ | 3.47 |  | $ | 2.07 |
Duke Energy Indiana |  |  |  |  |  |  |
FTRs | 11 |  | RTO auction pricing | FTR price – per MWh | (0.66) |  | – | 9.24 |  | 1.15 |
Piedmont |  |  |  |  |  |  |
Natural gas contracts | (117) |  | Discounted cash flow | Forward natural gas curves – price per MMBtu | 1.59 |  | – | 2.46 |  | 1.91 |
Duke Energy |  |  |  |  |  |  |
Total Level 3 derivatives | $ | (102) |  |  |  |  |  |  |
Schedule of Long-term debt Fair Value | The fair value and book value of long-term debt, including current maturities, is summarized in the following table. Estimates determined are not necessarily indicative of amounts that could have been settled in current markets. Fair value of long-term debt uses Level 2 measurements.
| December 31, 2020 |  | December 31, 2019
(in millions) | Book Value |  | Fair Value |  | Book Value |  | Fair Value
Duke Energy(a) | $ | 59,863 |  |  | $ | 69,292 |  |  | $ | 58,126 |  |  | $ | 63,062 |
Duke Energy Carolinas | 12,218 |  |  | 14,917 |  |  | 11,900 |  |  | 13,516 |
Progress Energy | 19,264 |  |  | 23,470 |  |  | 19,634 |  |  | 22,291 |
Duke Energy Progress | 9,258 |  |  | 10,862 |  |  | 9,058 |  |  | 9,934 |
Duke Energy Florida | 7,915 |  |  | 9,756 |  |  | 7,987 |  |  | 9,131 |
Duke Energy Ohio | 3,089 |  |  | 3,650 |  |  | 2,619 |  |  | 2,964 |
Duke Energy Indiana | 4,091 |  |  | 5,204 |  |  | 4,057 |  |  | 4,800 |
Piedmont | 2,780 |  |  | 3,306 |  |  | 2,384 |  |  | 2,642 |
(a) Book value of long-term debt includes $1.3 billion as of December 31, 2020, and $1.5 billion as of December 31, 2019, of unamortized debt discount and premium, net in purchase accounting adjustments related to the mergers with Progress Energy and Piedmont that are excluded from fair value of long-term debt.
Duke Energy Carolinas |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurement Amounts For Assets And Liabilities | The following tables provide recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets.
| December 31, 2020
(in millions) | Total Fair Value | Level 1 | Level 2 |  | Not Categorized
NDTF cash and cash equivalents | $ | 30 |  | $ | 30 |  | $ | — |  |  | $ | — |
NDTF equity securities | 3,685 |  | 3,639 |  | — |  |  | 46 |
NDTF debt securities | 1,250 |  | 192 |  | 1,058 |  |  | — |
Derivative assets | 20 |  | — |  | 20 |  |  | — |
Total assets | 4,985 |  | 3,861 |  | 1,078 |  |  | 46 |
Derivative liabilities | (20) |  | — |  | (20) |  |  | — |
Net assets | $ | 4,965 |  | $ | 3,861 |  | $ | 1,058 |  |  | $ | 46 |
| December 31, 2019
(in millions) | Total Fair Value | Level 1 | Level 2 |  | Not Categorized
NDTF cash and cash equivalents | $ | 21 |  | $ | 21 |  | $ | — |  |  | $ | — |
NDTF equity securities | 3,154 |  | 3,103 |  | — |  |  | 51 |
NDTF debt securities | 1,172 |  | 206 |  | 966 |  |  | — |
Total assets | 4,347 |  | 3,330 |  | 966 |  |  | 51 |
Derivative liabilities | (49) |  | — |  | (49) |  |  | — |
Net assets | $ | 4,298 |  | $ | 3,330 |  | $ | 917 |  |  | $ | 51 |
Progress Energy |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurement Amounts For Assets And Liabilities | The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets.
| December 31, 2020 |  | December 31, 2019
(in millions) | Total Fair Value | Level 1 | Level 2 |  |  | Total Fair Value | Level 1 | Level 2 |
NDTF cash and cash equivalents | $ | 147 |  | $ | 147 |  | $ | — |  |  |  | $ | 80 |  | $ | 80 |  | $ | — |  |
NDTF equity securities | 2,550 |  | 2,550 |  | — |  |  |  | 2,530 |  | 2,530 |  | — |  |
NDTF debt securities | 1,467 |  | 682 |  | 785 |  |  |  | 1,196 |  | 519 |  | 677 |  |
Other debt securities | 26 |  | — |  | 26 |  |  |  | 51 |  | — |  | 51 |  |
Other cash and cash equivalents | 106 |  | 106 |  |  |  |  | 49 |  | 49 |  | — |  |
Derivative assets | 33 |  | — |  | 33 |  |  |  | 7 |  | — |  | 7 |  |
Total assets | 4,329 |  | 3,485 |  | 844 |  |  |  | 3,913 |  | 3,178 |  | 735 |  |
NDTF equity security contracts | — |  | — |  | — |  |  |  | (23) |  | — |  | (23) |  |
Derivative liabilities | (29) |  | — |  | (29) |  |  |  | (65) |  | — |  | (65) |  |
Net assets | $ | 4,300 |  | $ | 3,485 |  | $ | 815 |  |  |  | $ | 3,825 |  | $ | 3,178 |  | $ | 647 |  |
Duke Energy Progress |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurement Amounts For Assets And Liabilities | The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets.
| December 31, 2020 |  | December 31, 2019 |
(in millions) | Total Fair Value | Level 1 | Level 2 |  |  | Total Fair Value | Level 1 | Level 2 |
NDTF cash and cash equivalents | $ | 76 |  | $ | 76 |  | $ | — |  |  |  | $ | 53 |  | $ | 53 |  | $ | — |  |
NDTF equity securities | 2,459 |  | 2,459 |  | — |  |  |  | 2,077 |  | 2,077 |  | — |  |
NDTF debt securities | 993 |  | 237 |  | 756 |  |  |  | 921 |  | 244 |  | 677 |  |
Other cash and cash equivalents | 1 |  | 1 |  | — |  |  |  | 2 |  | 2 |  | — |  |
Derivative assets | 33 |  | — |  | 33 |  |  |  | — |  | — |  | — |  |
Total assets | 3,562 |  | 2,773 |  | 789 |  |  |  | 3,053 |  | 2,376 |  | 677 |  |
Derivative liabilities | (14) |  | — |  | (14) |  |  |  | (49) |  | — |  | (49) |  |
Net assets | $ | 3,548 |  | $ | 2,773 |  | $ | 775 |  |  |  | $ | 3,004 |  | $ | 2,376 |  | $ | 628 |  |
Duke Energy Florida |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurement Amounts For Assets And Liabilities | The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets.
| December 31, 2020 |  | December 31, 2019 |
(in millions) | Total Fair Value | Level 1 | Level 2 |  | Total Fair Value | Level 1 | Level 2 |
NDTF cash and cash equivalents | $ | 71 |  | $ | 71 |  | $ | — |  |  | $ | 27 |  | $ | 27 |  | $ | — |  |
NDTF equity securities | 91 |  | 91 |  | — |  |  | 453 |  | 453 |  | — |  |
NDTF debt securities | 474 |  | 445 |  | 29 |  |  | 275 |  | 275 |  | — |  |
Other debt securities | 26 |  | — |  | 26 |  |  | 51 |  | — |  | 51 |  |
Other cash and cash equivalents | 1 |  | 1 |  | — |  |  | 4 |  | 4 |  | — |  |
Derivative assets | — |  | — |  | — |  |  | 7 |  | — |  | 7 |  |
Total assets | 663 |  | 608 |  | 55 |  |  | 817 |  | 759 |  | 58 |  |
NDTF equity security contracts | — |  | — |  | — |  |  | (23) |  | — |  | (23) |  |
Derivative liabilities | — |  | — |  | — |  |  | (1) |  | — |  | (1) |  |
Net assets | $ | 663 |  | $ | 608 |  | $ | 55 |  |  | $ | 793 |  | $ | 759 |  | $ | 34 |  |
Duke Energy Indiana |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurement Amounts For Assets And Liabilities | The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets.
| December 31, 2020 |  | December 31, 2019
(in millions) | Total Fair Value | Level 1 | Level 2 | Level 3 |  | Total Fair Value | Level 1 | Level 2 | Level 3
Other equity securities | $ | 97 |  | $ | 97 |  | $ | — |  | $ | — |  |  | $ | 81 |  | $ | 81 |  | $ | — |  | $ | — |
Other debt securities | 45 |  | — |  | 45 |  | — |  |  | 44 |  | — |  | 44 |  | — |
Other cash equivalents | 1 |  | 1 |  | — |  | — |  |  | — |  | — |  | — |  | — |
Derivative assets | 6 |  | — |  | — |  | 6 |  |  | 13 |  | 2 |  | — |  | 11 |
Total assets | 149 |  | 98 |  | 45 |  | 6 |  |  | 138 |  | 83 |  | 44 |  | 11 |
Derivative liabilities | (1) |  | (1) |  | — |  | — |  |  | (1) |  | (1) |  | — |  | — |
Total assets | $ | 148 |  | $ | 97 |  | $ | 45 |  | $ | 6 |  |  | $ | 137 |  | $ | 82 |  | $ | 44 |  | $ | 11 |
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs | The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.
| Derivatives (net)
| Years Ended December 31,
(in millions) | 2020 |  | 2019
Balance at beginning of period | $ | 11 |  |  | $ | 22 |
Purchases, sales, issuances and settlements: |  |  |
Purchases | 10 |  |  | 28 |
Settlements | (13) |  |  | (36) |
Total losses included on the Consolidated Balance Sheet | (2) |  |  | (3) |
Balance at end of period | $ | 6 |  |  | $ | 11 |
Piedmont |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Fair Value Measurement Amounts For Assets And Liabilities | The following table provides recorded balances for assets and liabilities measured at fair value on a recurring basis on the Consolidated Balance Sheets.
| December 31, 2020 |  | December 31, 2019
(in millions) | Total Fair Value | Level 1 | Level 2 |  |  | Total Fair Value | Level 1 |  | Level 3
Derivative assets | $ | 1 |  | $ | 1 |  | $ | — |  |  |  | $ | 1 |  | $ | 1 |  |  | $ | — |
Derivative liabilities | (122) |  | — |  | (122) |  |  |  | (117) |  | — |  |  | (117) |
Net (liabilities) assets | $ | (121) |  | $ | 1 |  | $ | (122) |  |  |  | $ | (116) |  | $ | 1 |  |  | $ | (117) |
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs | The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.
| Derivatives (net)
| Years Ended December 31,
(in millions) | 2020 |  | 2019
Balance at beginning of period | $ | (117) |  |  | $ | (141) |
Net transfers Out of Level 3(a) | 117 |  |  | — |
Total gains and settlements | — |  |  | 24 |
Balance at end of period | $ | — |  |  | $ | (117) |
(a) Transferred from Level 3 to Level 2 because observable market data became available.

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