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Debt and Credit Facilities (Summary of Debt and Related Terms) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate (as a percent) | 3.50% | 3.62%
Unsecured Debt | $ 24,564 | $ 23,669
Secured Debt | 5,584 | 4,270
First mortgage bonds | 31,026 | 29,177
Finance leases | 915 | 845
Tax exempt bonds | 360 | 477
Notes payable and commercial paper | 3,929 | 3,407
Fair value hedge carrying value adjustment | 4 | 4
Unamortized debt discount and premium, net | 1,119 | 1,217
Unamortized debt issuance costs | (362) | (330)
Total debt | 67,139 | 62,736
Short-term notes payable and commercial paper | (3,304) | (2,873)
Current maturities of long-term debt | (3,387) | (4,238)
Total long-term debt | 60,448 | 55,625
Short term obligations classified as long-term debt | $ 937 | $ 937
Unsecured Debt |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate (as a percent) | 3.71% | 3.71%
Secured Debt |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate (as a percent) | 2.50% | 2.67%
First Mortgage Bonds |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate (as a percent) | 3.87% | 4.00%
Capital Lease Obligations |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate (as a percent) | 5.81% | 6.96%
Tax Exempt Bonds |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate (as a percent) | 0.65% | 0.75%
Short term obligations classified as long-term debt | $ 312 | $ 312
Notes Payable And Commercial Paper |  |
Debt Instrument [Line Items] |  |
Weighted Average Interest Rate (as a percent) | 0.35% | 0.51%
Short term obligations classified as long-term debt | $ 625 | $ 625
Weighted average days to maturity | 15 days | 23 days
Parent Company | Purchase Accounting Adjustments |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | $ 29 | $ 33
Duke Energy Carolinas |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | 1,150 | 1,150
Secured Debt | 1,094 | 543
First mortgage bonds | 10,507 | 10,008
Finance leases | 289 | 294
Money pool/intercompany borrowings | 526 | 806
Fair value hedge carrying value adjustment | 4 | 4
Unamortized debt discount and premium, net | (21) | (20)
Unamortized debt issuance costs | (67) | (62)
Total debt | 13,482 | 12,723
Short-term money pool/intercompany borrowings | (226) | (506)
Current maturities of long-term debt | (362) | (506)
Total long-term debt | 12,894 | 11,711
Short term obligations classified as long-term debt | 300 | 300
Progress Energy |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | 2,250 | 3,150
Secured Debt | 2,397 | 1,584
First mortgage bonds | 15,450 | 14,100
Finance leases | 690 | 377
Tax exempt bonds | 48 | 48
Money pool/intercompany borrowings | 2,959 | 3,119
Unamortized debt discount and premium, net | (34) | (31)
Unamortized debt issuance costs | (128) | (113)
Total debt | 23,632 | 22,234
Short-term money pool/intercompany borrowings | (2,809) | (2,969)
Current maturities of long-term debt | (1,082) | (1,426)
Total long-term debt | 19,741 | 17,839
Duke Energy Progress |  |
Debt Instrument [Line Items] |  |
Unsecured Debt |  | 700
Secured Debt | 1,120 | 252
First mortgage bonds | 8,375 | 7,875
Finance leases | 629 | 296
Tax exempt bonds | 48 | 48
Money pool/intercompany borrowings | 322 | 445
Unamortized debt discount and premium, net | (19) | (19)
Unamortized debt issuance costs | (54) | (44)
Total debt | 10,421 | 9,553
Short-term money pool/intercompany borrowings | (172) | (295)
Current maturities of long-term debt | (556) | (603)
Total long-term debt | 9,693 | 8,655
Short term obligations classified as long-term debt | 150 | 150
Duke Energy Progress | Purchase Accounting Adjustments |  |
Debt Instrument [Line Items] |  |
Finance leases |  | 24
Duke Energy Florida |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | 150 | 350
Secured Debt | 1,278 | 1,332
First mortgage bonds | 7,075 | 6,225
Finance leases | 61 | 81
Money pool/intercompany borrowings | 199 | 196
Unamortized debt discount and premium, net | (14) | (11)
Unamortized debt issuance costs | (68) | (62)
Total debt | 8,681 | 8,111
Short-term money pool/intercompany borrowings | (199) | (196)
Current maturities of long-term debt | (76) | (823)
Total long-term debt | 8,406 | 7,092
Duke Energy Florida | Purchase Accounting Adjustments |  |
Debt Instrument [Line Items] |  |
Finance leases | 256 | 341
Duke Energy Ohio |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | 1,330 | 1,180
First mortgage bonds | 1,850 | 1,850
Tax exempt bonds | 27 | 77
Money pool/intercompany borrowings | 128 | 194
Unamortized debt discount and premium, net | (27) | (29)
Unamortized debt issuance costs | (13) | (14)
Total debt | 3,295 | 3,258
Short-term money pool/intercompany borrowings | (103) | (169)
Current maturities of long-term debt |  | (50)
Total long-term debt | 3,192 | 3,039
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 Indiana |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | 700 | 403
First mortgage bonds | 3,219 | 3,219
Finance leases | 10 | 10
Tax exempt bonds | 285 | 352
Money pool/intercompany borrowings | 150 | 281
Unamortized debt discount and premium, net | (18) | (18)
Unamortized debt issuance costs | (23) | (25)
Total debt | 4,323 | 4,222
Short-term money pool/intercompany borrowings |  | (131)
Current maturities of long-term debt | (84) | (70)
Total long-term debt | 4,239 | 4,021
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
Piedmont |  |
Debt Instrument [Line Items] |  |
Unsecured Debt | 2,990 | 2,800
Money pool/intercompany borrowings | 518 | 530
Unamortized debt discount and premium, net | (6) | (5)
Unamortized debt issuance costs | (16) | (15)
Total debt | 3,486 | 3,310
Short-term money pool/intercompany borrowings | (518) | (530)
Current maturities of long-term debt |  | (160)
Total long-term debt | 2,968 | 2,620
Progress Energy | Purchase Accounting Adjustments |  |
Debt Instrument [Line Items] |  |
Unamortized debt discount and premium, net | 1,121 | 1,196
Piedmont | Purchase Accounting Adjustments |  |
Debt Instrument [Line Items] |  |
Unamortized debt discount and premium, net | $ 100 | $ 117

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