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Investments in Debt and Equity Securities (Tables)
 9 Months Ended
Sep. 30, 2021
Debt Securities, Available-for-sale [Line Items]  
Debt Securities, Trading, and Equity Securities, FV-NI
The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
September 30, 2021December 31, 2020
GrossGrossGrossGross
UnrealizedUnrealizedEstimatedUnrealizedUnrealizedEstimated
HoldingHoldingFairHoldingHoldingFair
(in millions)GainsLossesValueGainsLossesValue
NDTF
Cash and cash equivalents$— $— $164 $— $— $177 
Equity securities4,700 35 6,754 4,138 54 6,235 
Corporate debt securities44 5 847 76 1 806 
Municipal bonds13 1 296 22 — 370 
U.S. government bonds34 8 1,605 51 — 1,361 
Other debt securities4 1 195 8 — 180 
Total NDTF Investments$4,795 $50 $9,861 $4,295 $55 $9,129 
Other Investments
Cash and cash equivalents$— $— $87 $— $— $127 
Equity securities83 — 145 79 — 146 
Corporate debt securities4 1 130 8 — 110 
Municipal bonds3 1 69 5 — 86 
U.S. government bonds— — 50 — — 42 
Other debt securities— — 34 — — 47 
Total Other Investments$90 $2 $515 $92 $— $558 
Total Investments$4,885 $52 $10,376 $4,387 $55 $9,687 
Debt Securities, Available-for-sale
The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
September 30, 2021December 31, 2020
GrossGrossGrossGross
UnrealizedUnrealizedEstimatedUnrealizedUnrealizedEstimated
HoldingHoldingFairHoldingHoldingFair
(in millions)GainsLossesValueGainsLossesValue
NDTF
Cash and cash equivalents$— $— $164 $— $— $177 
Equity securities4,700 35 6,754 4,138 54 6,235 
Corporate debt securities44 5 847 76 1 806 
Municipal bonds13 1 296 22 — 370 
U.S. government bonds34 8 1,605 51 — 1,361 
Other debt securities4 1 195 8 — 180 
Total NDTF Investments$4,795 $50 $9,861 $4,295 $55 $9,129 
Other Investments
Cash and cash equivalents$— $— $87 $— $— $127 
Equity securities83 — 145 79 — 146 
Corporate debt securities4 1 130 8 — 110 
Municipal bonds3 1 69 5 — 86 
U.S. government bonds— — 50 — — 42 
Other debt securities— — 34 — — 47 
Total Other Investments$90 $2 $515 $92 $— $558 
Total Investments$4,885 $52 $10,376 $4,387 $55 $9,687 
Schedule of Realized Gain (Loss)
Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.
Three Months EndedNine Months Ended
(in millions)September 30, 2021September 30, 2020September 30, 2021September 30, 2020
FV-NI:
 Realized gains $34 $13 $320 $338 
 Realized losses40 16 100 148 
AFS:
 Realized gains17 26 51 73 
 Realized losses15 19 46 38 
Investments Classified by Contractual Maturity Date
The table below summarizes the maturity date for debt securities.
September 30, 2021
DukeDukeDukeDuke
DukeEnergyProgressEnergyEnergyEnergy
(in millions)EnergyCarolinasEnergyProgressFloridaIndiana
Due in one year or less$151 $3 $121 $22 $99 $5 
Due after one through five years954 343 548 244 304 18 
Due after five through 10 years639 268 286 247 39 8 
Due after 10 years1,482 847 553 517 36 15 
Total$3,226 $1,461 $1,508 $1,030 $478 $46 
Duke Energy Carolinas  
Debt Securities, Available-for-sale [Line Items]  
Debt Securities, Trading, and Equity Securities, FV-NI
The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
September 30, 2021December 31, 2020
GrossGrossGrossGross
UnrealizedUnrealizedEstimatedUnrealizedUnrealizedEstimated
HoldingHoldingFairHoldingHoldingFair
(in millions)GainsLossesValueGainsLossesValue
NDTF
Cash and cash equivalents$— $— $60 $— $— $30 
Equity securities2,725 14 3,912 2,442 23 3,685 
Corporate debt securities27 3 495 49 1 510 
Municipal bonds1 — 24 6 — 91 
U.S. government bonds18 2 752 25 — 475 
Other debt securities4 1 190 7 — 174 
Total NDTF Investments$2,775 $20 $5,433 $2,529 $24 $4,965 
Debt Securities, Available-for-sale
The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
September 30, 2021December 31, 2020
GrossGrossGrossGross
UnrealizedUnrealizedEstimatedUnrealizedUnrealizedEstimated
HoldingHoldingFairHoldingHoldingFair
(in millions)GainsLossesValueGainsLossesValue
NDTF
Cash and cash equivalents$— $— $60 $— $— $30 
Equity securities2,725 14 3,912 2,442 23 3,685 
Corporate debt securities27 3 495 49 1 510 
Municipal bonds1 — 24 6 — 91 
U.S. government bonds18 2 752 25 — 475 
Other debt securities4 1 190 7 — 174 
Total NDTF Investments$2,775 $20 $5,433 $2,529 $24 $4,965 
Schedule of Realized Gain (Loss)
Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.
Three Months EndedNine Months Ended
(in millions)September 30, 2021September 30, 2020September 30, 2021September 30, 2020
FV-NI:
 Realized gains$25 $10 $243 $46 
 Realized losses 29 12 68 82 
AFS:
 Realized gains10 20 35 50 
 Realized losses10 17 32 30 
Progress Energy  
Debt Securities, Available-for-sale [Line Items]  
Debt Securities, Trading, and Equity Securities, FV-NI
The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
September 30, 2021December 31, 2020
GrossGrossGrossGross
UnrealizedUnrealizedEstimatedUnrealizedUnrealizedEstimated
HoldingHoldingFairHoldingHoldingFair
(in millions)GainsLossesValueGainsLossesValue
NDTF
Cash and cash equivalents$— $— $104 $— $— $147 
Equity securities1,975 21 2,842 1,696 31 2,550 
Corporate debt securities17 2 352 27 — 296 
Municipal bonds12 1 272 16 — 279 
U.S. government bonds16 6 853 26 — 886 
Other debt securities— — 5 1 — 6 
Total NDTF Investments$2,020 $30 $4,428 $1,766 $31 $4,164 
Other Investments
Cash and cash equivalents$— $— $18 $— $— $106 
Municipal bonds2 — 26 3 — 26 
Total Other Investments$2 $— $44 $3 $— $132 
Total Investments$2,022 $30 $4,472 $1,769 $31 $4,296 
Debt Securities, Available-for-sale
The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
September 30, 2021December 31, 2020
GrossGrossGrossGross
UnrealizedUnrealizedEstimatedUnrealizedUnrealizedEstimated
HoldingHoldingFairHoldingHoldingFair
(in millions)GainsLossesValueGainsLossesValue
NDTF
Cash and cash equivalents$— $— $104 $— $— $147 
Equity securities1,975 21 2,842 1,696 31 2,550 
Corporate debt securities17 2 352 27 — 296 
Municipal bonds12 1 272 16 — 279 
U.S. government bonds16 6 853 26 — 886 
Other debt securities— — 5 1 — 6 
Total NDTF Investments$2,020 $30 $4,428 $1,766 $31 $4,164 
Other Investments
Cash and cash equivalents$— $— $18 $— $— $106 
Municipal bonds2 — 26 3 — 26 
Total Other Investments$2 $— $44 $3 $— $132 
Total Investments$2,022 $30 $4,472 $1,769 $31 $4,296 
Schedule of Realized Gain (Loss)
Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.
Three Months EndedNine Months Ended
(in millions)September 30, 2021September 30, 2020September 30, 2021September 30, 2020
FV-NI:
 Realized gains$9 $3 $77 $292 
 Realized losses11 4 32 66 
AFS:
 Realized gains7 6 14 17 
 Realized losses6 2 12 7 
Duke Energy Progress  
Debt Securities, Available-for-sale [Line Items]  
Debt Securities, Trading, and Equity Securities, FV-NI
The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
September 30, 2021December 31, 2020
GrossGrossGrossGross
UnrealizedUnrealizedEstimatedUnrealizedUnrealizedEstimated
HoldingHoldingFairHoldingHoldingFair
(in millions)GainsLossesValueGainsLossesValue
NDTF
Cash and cash equivalents$— $— $92 $— $— $76 
Equity securities1,882 21 2,736 1,617 31 2,459 
Corporate debt securities17 2 287 27 — 296 
Municipal bonds12 1 272 16 — 279 
U.S. government bonds16 2 466 26 — 412 
Other debt securities— — 5 1 — 6 
Total NDTF Investments$1,927 $26 $3,858 $1,687 $31 $3,528 
Other Investments
Cash and cash equivalents$— $— $16 $— $— $1 
Total Other Investments$— $— $16 $— $— $1 
Total Investments$1,927 $26 $3,874 $1,687 $31 $3,529 
Debt Securities, Available-for-sale
The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
September 30, 2021December 31, 2020
GrossGrossGrossGross
UnrealizedUnrealizedEstimatedUnrealizedUnrealizedEstimated
HoldingHoldingFairHoldingHoldingFair
(in millions)GainsLossesValueGainsLossesValue
NDTF
Cash and cash equivalents$— $— $92 $— $— $76 
Equity securities1,882 21 2,736 1,617 31 2,459 
Corporate debt securities17 2 287 27 — 296 
Municipal bonds12 1 272 16 — 279 
U.S. government bonds16 2 466 26 — 412 
Other debt securities— — 5 1 — 6 
Total NDTF Investments$1,927 $26 $3,858 $1,687 $31 $3,528 
Other Investments
Cash and cash equivalents$— $— $16 $— $— $1 
Total Other Investments$— $— $16 $— $— $1 
Total Investments$1,927 $26 $3,874 $1,687 $31 $3,529 
Schedule of Realized Gain (Loss)
Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows.
Three Months EndedNine Months Ended
(in millions)September 30, 2021September 30, 2020September 30, 2021September 30, 2020
FV-NI:
 Realized gains$9 $3 $76 $43 
 Realized losses11 4 31 51 
AFS:
 Realized gains6 6 13 17 
 Realized losses5 2 11 7 
Duke Energy Florida  
Debt Securities, Available-for-sale [Line Items]  
Debt Securities, Trading, and Equity Securities, FV-NI
The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
September 30, 2021December 31, 2020
GrossGrossGrossGross
UnrealizedUnrealizedEstimatedUnrealizedUnrealizedEstimated
HoldingHoldingFairHoldingHoldingFair
(in millions)GainsLossesValueGainsLossesValue
NDTF
Cash and cash equivalents$— $— $12 $— $— $71 
Equity securities93 — 106 79 — 91 
Corporate debt securities— — 65 — — — 
U.S. government bonds— 4 387 — — 474 
Total NDTF Investments(a)
$93 $4 $570 $79 $— $636 
Other Investments
Cash and cash equivalents$— $— $1 $— $— $1 
Municipal bonds2 — 26 3 — 26 
Total Other Investments$2 $— $27 $3 $— $27 
Total Investments$95 $4 $597 $82 $— $663 
(a)During the nine months ended September 30, 2021, and the year ended December 31, 2020, Duke Energy Florida received reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.
Debt Securities, Available-for-sale
The following table presents the estimated fair value of investments in debt and equity securities; equity investments are classified as FV-NI and debt investments are classified as AFS.
September 30, 2021December 31, 2020
GrossGrossGrossGross
UnrealizedUnrealizedEstimatedUnrealizedUnrealizedEstimated
HoldingHoldingFairHoldingHoldingFair
(in millions)GainsLossesValueGainsLossesValue
NDTF
Cash and cash equivalents$— $— $12 $— $— $71 
Equity securities93 — 106 79 — 91 
Corporate debt securities— — 65 — — — 
U.S. government bonds— 4 387 — — 474 
Total NDTF Investments(a)
$93 $4 $570 $79 $— $636 
Other Investments
Cash and cash equivalents$— $— $1 $— $— $1 
Municipal bonds2 — 26 3 — 26 
Total Other Investments$2 $— $27 $3 $— $27 
Total Investments$95 $4 $597 $82 $— $663 
(a)During the nine months ended September 30, 2021, and the year ended December 31, 2020, Duke Energy Florida received reimbursements from the NDTF for costs related to ongoing decommissioning activity of Crystal River Unit 3.
Schedule of Realized Gain (Loss)
Realized gains and losses, which were determined on a specific identification basis, from sales of FV-NI and AFS securities for the three and nine months ended September 30, 2021, and 2020, were as follows:
Three Months EndedNine Months Ended
(in millions)September 30, 2021September 30, 2020September 30, 2021September 30, 2020
FV-NI:
Realized gains$— $— $1 $249 
Realized losses— — 1 15 
AFS:
 Realized gains1 — 1 — 
 Realized losses1 — 1 — 
Duke Energy Indiana  
Debt Securities, Available-for-sale [Line Items]  
Debt Securities, Trading, and Equity Securities, FV-NI
The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS.
September 30, 2021December 31, 2020
GrossGrossGrossGross
UnrealizedUnrealizedEstimatedUnrealizedUnrealizedEstimated
HoldingHoldingFairHoldingHoldingFair
(in millions)GainsLossesValueGainsLossesValue
Investments
Cash and cash equivalents$— $— $19 $— $— $1 
Equity securities56 — 90 58 — 97 
Corporate debt securities— — 5 — — 3 
Municipal bonds1 1 36 1 — 38 
U.S. government bonds— — 5 — — 4 
Total Investments$57 $1 $155 $59 $— $143 
Debt Securities, Available-for-sale
The following table presents the estimated fair value of investments in debt and equity securities; equity investments are measured at FV-NI and debt investments are classified as AFS.
September 30, 2021December 31, 2020
GrossGrossGrossGross
UnrealizedUnrealizedEstimatedUnrealizedUnrealizedEstimated
HoldingHoldingFairHoldingHoldingFair
(in millions)GainsLossesValueGainsLossesValue
Investments
Cash and cash equivalents$— $— $19 $— $— $1 
Equity securities56 — 90 58 — 97 
Corporate debt securities— — 5 — — 3 
Municipal bonds1 1 36 1 — 38 
U.S. government bonds— — 5 — — 4 
Total Investments$57 $1 $155 $59 $— $143