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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021
(in millions)Total Fair ValueLevel 1Level 2Level 3Not Categorized
NDTF cash and cash equivalents$160 $160 $— $— $— 
NDTF equity securities7,350 7,300 — — 50 
NDTF debt securities2,891 967 1,924 — — 
Other equity securities156 156 — — — 
Other debt securities300 45 255 — — 
Other cash and cash equivalents36 36 — — — 
Derivative assets320 3 293 24 — 
Total assets11,213 8,667 2,472 24 50 
Derivative liabilities(472)(13)(314)(145)— 
Net assets (liabilities)$10,741 $8,654 $2,158 $(121)$50 
 December 31, 2020
(in millions)Total Fair ValueLevel 1Level 2Level 3Not Categorized
NDTF cash and cash equivalents$177 $177 $— $— $— 
NDTF equity securities6,235 6,189 — — 46 
NDTF debt securities2,717 874 1,843 — — 
Other equity securities146 146 — — — 
Other debt securities285 37 248 — — 
Other cash and cash equivalents127 127 — — — 
Derivative assets61 1 53 7 — 
Total assets9,748 7,551 2,144 7 46 
Derivative liabilities(324)— (240)(84)— 
Net assets (liabilities)$9,424 $7,551 $1,904 $(77)$46 
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs
The following table provides reconciliations of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.
Derivatives (net)
 Years Ended December 31,
(in millions) 20212020
Balance at beginning of period$(77)$(102)
Total pretax realized or unrealized losses included in comprehensive income(75)(84)
Purchases, sales, issuances and settlements:
Purchases21 14 
Settlements(5)(19)
Net transfers Out of Level 3(a)
— 117 
Total gains (losses) included on the Consolidated Balance Sheet15 (3)
Balance at end of period$(121)$(77)
(a)    Transferred from Level 3 to Level 2 because observable market data became available.
Quantitative Information Table - Level 3
The following tables include quantitative information about the Duke Energy Registrants' derivatives classified as Level 3.
December 31, 2021
Weighted
Fair ValueAverage
Investment Type(in millions)Valuation TechniqueUnobservable InputRangeRange
Duke Energy
Electricity contracts$(145)RTO forward pricingForward electricity curves – price per MWh$19.04 –$139.11 $37.57 
Duke Energy Ohio
FTRs2 RTO auction pricingFTR price – per MWh0.06 –1.79 0.96 
Duke Energy Indiana
FTRs22 RTO auction pricingFTR price – per MWh(1.18)–13.11 2.68 
Duke Energy
Total Level 3 derivatives$(121)
December 31, 2020
Weighted
Fair ValueAverage
Investment Type(in millions)Valuation TechniqueUnobservable InputRangeRange
Duke Energy
Electricity contracts$(84)Discounted cash flowForward electricity curves – price per MWh$14.68 
–
$151.84 $28.84 
Duke Energy Ohio
FTRs1 RTO auction pricingFTR price – per MWh0.25 
–
1.68 0.79 
Duke Energy Indiana
FTRs6 RTO auction pricingFTR price – per MWh(2.40)
–
7.41 1.05 
Duke Energy
Total Level 3 derivatives$(77)
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, 2021December 31, 2020
(in millions)Book ValueFair ValueBook ValueFair Value
Duke Energy(a)
$63,835 $69,683 $59,863 $69,292 
Duke Energy Carolinas13,275 15,101 12,218 14,917 
Progress Energy20,823 23,751 19,264 23,470 
Duke Energy Progress10,249 11,252 9,258 10,862 
Duke Energy Florida8,482 9,772 7,915 9,756 
Duke Energy Ohio3,193 3,570 3,089 3,650 
Duke Energy Indiana4,323 5,067 4,091 5,204 
Piedmont2,968 3,278 2,780 3,306 
(a)    Book value of long-term debt includes $1.25 billion as of December 31, 2021, and $1.3 billion as of December 31, 2020, 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, 2021
(in millions)Total Fair ValueLevel 1Level 2Not Categorized
NDTF cash and cash equivalents$53 $53 $— $— 
NDTF equity securities4,265 4,215 — 50 
NDTF debt securities1,441 339 1,102 — 
Derivative assets162 — 162 — 
Total assets5,921 4,607 1,264 50 
Derivative liabilities(35)— (35)— 
Net assets$5,886 $4,607 $1,229 $50 
 December 31, 2020
(in millions)Total Fair ValueLevel 1Level 2Not Categorized
NDTF cash and cash equivalents$30 $30 $— $— 
NDTF equity securities3,685 3,639 — 46 
NDTF debt securities1,250 192 1,058 — 
Derivative assets20 — 20 — 
Total assets4,985 3,861 1,078 46 
Derivative liabilities(20)— (20)— 
Net assets$4,965 $3,861 $1,058 $46 
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, 2021December 31, 2020
(in millions)Total Fair ValueLevel 1Level 2Total Fair ValueLevel 1Level 2
NDTF cash and cash equivalents$107 $107 $— $147 $147 $— 
NDTF equity securities3,085 3,085 — 2,550 2,550 — 
NDTF debt securities1,450 628 822 1,467 682 785 
Other debt securities26 — 26 26 — 26 
Other cash and cash equivalents20 20 — 106 106 
Derivative assets124 — 124 33 — 33 
Total assets4,812 3,840 972 4,329 3,485 844 
Derivative liabilities(24)— (24)(29)— (29)
Net assets$4,788 $3,840 $948 $4,300 $3,485 $815 
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, 2021December 31, 2020
(in millions)Total Fair ValueLevel 1Level 2Total Fair ValueLevel 1Level 2
NDTF cash and cash equivalents$94 $94 $— $76 $76 $— 
NDTF equity securities2,970 2,970 — 2,459 2,459 — 
NDTF debt securities1,025 289 736 993 237 756 
Other cash and cash equivalents16 16 — 1 1 — 
Derivative assets124 — 124 33 — 33 
Total assets4,229 3,369 860 3,562 2,773 789 
Derivative liabilities(10)— (10)(14)— (14)
Net assets$4,219 $3,369 $850 $3,548 $2,773 $775 
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, 2021December 31, 2020
(in millions)Total Fair ValueLevel 1Level 2Total Fair ValueLevel 1Level 2
NDTF cash and cash equivalents$13 $13 $— $71 $71 $— 
NDTF equity securities115 115 — 91 91 — 
NDTF debt securities425 339 86 474 445 29 
Other debt securities26 — 26 26 — 26 
Other cash and cash equivalents3 3 — 1 1 — 
Total assets582 470 112 663 608 55 
Derivative liabilities(14)— (14)— — — 
Net assets$568 $470 $98 $663 $608 $55 
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, 2021December 31, 2020
(in millions)Total Fair ValueLevel 1Level 2Level 3Total Fair ValueLevel 1Level 2Level 3
Other equity securities$97 $97 $— $— $97 $97 $— $— 
Other debt securities64 — 64 — 45 — 45 — 
Other cash equivalents— — — — 1 1 — — 
Derivative assets23 1 — 22 6 — — 6 
Total assets184 98 64 22 149 98 45 6 
Derivative liabilities(27)(13)(14)— (1)(1)— — 
Net assets$157 $85 $50 $22 $148 $97 $45 $6 
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)20212020
Balance at beginning of period$6 $11 
Purchases, sales, issuances and settlements:
Purchases18 10 
Settlements(16)(13)
Total gains (losses) included on the Consolidated Balance Sheet14 (2)
Balance at end of period$22 $6 
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, 2021December 31, 2020
(in millions)Total Fair ValueLevel 1Level 2Total Fair ValueLevel 1Level 2
Derivative assets$3 $3 $— $1 $1 $— 
Derivative liabilities(139)— (139)(122)— (122)
Net (liabilities) assets$(136)$3 $(139)$(121)$1 $(122)
Reconciliation Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs
The following table provides a reconciliation of beginning and ending balances of assets and liabilities measured at fair value using Level 3 measurements.
 Derivatives (net)
 Year Ended December 31,
(in millions)2020
Balance at beginning of period$(117)
Net transfers Out of Level 3(a)
117 
Balance at end of period$— 
(a)    Transferred from Level 3 to Level 2 because observable market data became available.