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Debt and Credit Facilities (Summary of Debt and Related Terms) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |
Weighted-average rate | 3.62% | 3.92%
Unsecured Debt | $ 23,669 | $ 22,477
Secured Debt | 4,270 | 4,537
First mortgage bonds | 29,177 | 27,977
Finance leases | 845 | 969
Tax exempt bonds | 477 | 730
Notes payable and commercial paper | 3,407 | 3,588
Money pool/intercompany borrowings | 0 |
Fair value hedge carrying value adjustment | 4 | 5
Unamortized debt discount and premium, net | 1,217 | 1,294
Unamortized debt issuance costs | (330) | (316)
Total debt | 62,736 | 61,261
Short-term notes payable and commercial paper | (2,873) | (3,135)
Current maturities of long-term debt | (4,238) | (3,141)
Total long-term debt | 55,625 | 54,985
Short term obligations classified as long-term debt | $ 937 | $ 937
Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Weighted-average rate | 3.71% | 4.02%
Secured Debt |  |
Debt Instrument [Line Items] |  |
Weighted-average rate | 2.67% | 3.30%
First Mortgage Bonds |  |
Debt Instrument [Line Items] |  |
Weighted-average rate | 4.00% | 4.13%
Capital Lease Obligations |  |
Debt Instrument [Line Items] |  |
Weighted-average rate | 6.96% | 6.60%
Tax Exempt Bonds |  |
Debt Instrument [Line Items] |  |
Weighted-average rate | 0.75% | 2.90%
Short term obligations classified as long-term debt | $ 312 | $ 312
Commercial Paper |  |
Debt Instrument [Line Items] |  |
Short term obligations classified as long-term debt | $ 625 | $ 625
Notes Payable And Commercial Paper |  |
Debt Instrument [Line Items] |  |
Weighted-average rate | 0.51% | 1.98%
Short term obligations classified as long-term debt | $ 625 | $ 625
Weighted average days to maturity | 23 days | 14 days
Parent Company | Purchase Accounting Adjustments |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | $ 33 | $ 37
Duke Energy Carolinas |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | 1,150 | 1,150
Secured Debt | 543 | 544
First mortgage bonds | 10,008 | 9,557
Finance leases | 294 | 179
Tax exempt bonds |  | 243
Money pool/intercompany borrowings | 806 | 329
Fair value hedge carrying value adjustment | 4 | 5
Unamortized debt discount and premium, net | (20) | (23)
Unamortized debt issuance costs | (62) | (55)
Total debt | 12,723 | 11,929
Short-term money pool/intercompany borrowings | (506) | (29)
Current maturities of long-term debt | (506) | (458)
Total long-term debt | 11,711 | 11,442
Short term obligations classified as long-term debt | 300 | 300
Duke Energy Carolinas | Commercial Paper |  |
Debt Instrument [Line Items] |  |
Short term obligations classified as long-term debt | 300 | 300
Progress Energy |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | 3,150 | 3,650
Secured Debt | 1,584 | 1,722
First mortgage bonds | 14,100 | 13,800
Finance leases | 377 | 405
Tax exempt bonds | 48 | 48
Money pool/intercompany borrowings | 3,119 | 1,970
Unamortized debt discount and premium, net | (31) | (29)
Unamortized debt issuance costs | (113) | (111)
Total debt | 22,234 | 21,455
Short-term money pool/intercompany borrowings | (2,969) | (1,821)
Current maturities of long-term debt | (1,426) | (1,577)
Total long-term debt | 17,839 | 18,057
Duke Energy Progress |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | 700 | 700
Secured Debt | 252 | 335
First mortgage bonds | 7,875 | 7,575
Finance leases | 296 | 307
Tax exempt bonds | 48 | 48
Money pool/intercompany borrowings | 445 | 216
Unamortized debt discount and premium, net | (19) | (17)
Unamortized debt issuance costs | (44) | (40)
Total debt | 9,553 | 9,124
Short-term money pool/intercompany borrowings | (295) | (66)
Current maturities of long-term debt | (603) | (1,006)
Total long-term debt | 8,655 | 8,052
Short term obligations classified as long-term debt | 150 | 150
Duke Energy Progress | Commercial Paper |  |
Debt Instrument [Line Items] |  |
Short term obligations classified as long-term debt | 150 | 150
Duke Energy Progress | Purchase Accounting Adjustments |  |
Debt Instrument [Line Items] |  |
Finance leases | 24 | 44
Duke Energy Florida |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | 350 | 350
Secured Debt | 1,332 | 1,387
First mortgage bonds | 6,225 | 6,225
Finance leases | 81 | 98
Money pool/intercompany borrowings | 196 |
Unamortized debt discount and premium, net | (11) | (11)
Unamortized debt issuance costs | (62) | (62)
Total debt | 8,111 | 7,987
Short-term money pool/intercompany borrowings | (196) |
Current maturities of long-term debt | (823) | (571)
Total long-term debt | 7,092 | 7,416
Duke Energy Florida | Purchase Accounting Adjustments |  |
Debt Instrument [Line Items] |  |
Finance leases | 341 | 419
Duke Energy Ohio |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | 1,180 | 1,110
First mortgage bonds | 1,850 | 1,449
Tax exempt bonds | 77 | 77
Money pool/intercompany borrowings | 194 | 337
Unamortized debt discount and premium, net | (29) | (30)
Unamortized debt issuance costs | (14) | (12)
Total debt | 3,258 | 2,931
Short-term money pool/intercompany borrowings | (169) | (312)
Current maturities of long-term debt | (50) |
Total long-term debt | 3,039 | 2,619
Short term obligations classified as long-term debt | 52 | 52
Duke Energy Ohio | Tax Exempt Bonds |  |
Debt Instrument [Line Items] |  |
Short term obligations classified as long-term debt | 27 | 27
Duke Energy Ohio | Commercial Paper |  |
Debt Instrument [Line Items] |  |
Short term obligations classified as long-term debt | 25 | 25
Duke Energy Indiana |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | 403 | 405
First mortgage bonds | 3,219 | 3,169
Finance leases | 10 | 10
Tax exempt bonds | 352 | 362
Money pool/intercompany borrowings | 281 | 180
Unamortized debt discount and premium, net | (18) | (19)
Unamortized debt issuance costs | (25) | (20)
Total debt | 4,222 | 4,087
Short-term money pool/intercompany borrowings | (131) | (30)
Current maturities of long-term debt | (70) | (503)
Total long-term debt | 4,021 | 3,554
Short term obligations classified as long-term debt | 435 | 435
Duke Energy Indiana | Tax Exempt Bonds |  |
Debt Instrument [Line Items] |  |
Short term obligations classified as long-term debt | 285 | 285
Duke Energy Indiana | Commercial Paper |  |
Debt Instrument [Line Items] |  |
Short term obligations classified as long-term debt | 150 | 150
Piedmont |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | 2,800 | 2,399
Money pool/intercompany borrowings | 530 | 476
Unamortized debt discount and premium, net | (5) | (2)
Unamortized debt issuance costs | (15) | (13)
Total debt | 3,310 | 2,860
Short-term money pool/intercompany borrowings | (530) | (476)
Current maturities of long-term debt | (160) | 0
Total long-term debt | 2,620 | 2,384
Progress Energy | Purchase Accounting Adjustments |  |
Debt Instrument [Line Items] |  |
Unamortized debt discount and premium, net | 1,196 | 1,275
Piedmont | Purchase Accounting Adjustments |  |
Debt Instrument [Line Items] |  |
Unamortized debt discount and premium, net | $ 117 | $ 137

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