Derivatives and Hedging (Location and Fair Value Amounts of Derivatives Reflected in the Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	$ 320	$ 61
Location and fair value amounts of derivatives liabilities	472	324
Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	204	48
Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	116	13
Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	184	64
Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	288	260
Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	312	43
Location and fair value amounts of derivatives liabilities	348	251
Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	8	18
Location and fair value amounts of derivatives liabilities	124	73
Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	27	14
Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	117	70
Designated as Hedging Instruments | Interest Rate Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	3
Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	3
Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	75	15
Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	21	48
Not Designated as Hedging Instruments | Commodity Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	199	30
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	113	13
Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	72	30
Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	132	137
Not Designated as Hedging Instruments | Interest Rate Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	18
Not Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	10	5
Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	18	5
Duke Energy Carolinas
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	162	20
Location and fair value amounts of derivatives liabilities	35	20
Duke Energy Carolinas | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	99	14
Duke Energy Carolinas | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	63	6
Duke Energy Carolinas | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	26	17
Duke Energy Carolinas | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	9	3
Duke Energy Carolinas | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	162	20
Location and fair value amounts of derivatives liabilities	27	16
Duke Energy Carolinas | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	8	4
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	99	14
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	63	6
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	18	13
Duke Energy Carolinas | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	9	3
Duke Energy Carolinas | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	8	4
Progress Energy
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	124	33
Location and fair value amounts of derivatives liabilities	24	29
Progress Energy | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	74	27
Progress Energy | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	50	6
Progress Energy | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	19	2
Progress Energy | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	5	27
Progress Energy | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	122	15
Location and fair value amounts of derivatives liabilities	24	29
Progress Energy | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	18
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	72	9
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	50	6
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	19	2
Progress Energy | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	5	27
Progress Energy | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	18
Duke Energy Progress
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	124	33
Location and fair value amounts of derivatives liabilities	10	14
Duke Energy Progress | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	74	27
Duke Energy Progress | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	50	6
Duke Energy Progress | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	5	2
Duke Energy Progress | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	5	12
Duke Energy Progress | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	122	15
Location and fair value amounts of derivatives liabilities	10	14
Duke Energy Progress | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	18
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	72	9
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	50	6
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	5	2
Duke Energy Progress | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	5	12
Duke Energy Progress | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	18
Duke Energy Florida
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	14
Duke Energy Florida | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	14
Duke Energy Florida | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	14
Duke Energy Florida | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	14
Duke Energy Ohio
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	1
Location and fair value amounts of derivatives liabilities	5	6
Duke Energy Ohio | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	1
Duke Energy Ohio | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	1	1
Duke Energy Ohio | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	4	5
Duke Energy Ohio | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	1
Duke Energy Ohio | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	5	6
Duke Energy Ohio | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	2	1
Duke Energy Ohio | Not Designated as Hedging Instruments | Interest Rate Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	1	1
Duke Energy Ohio | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	4	5
Duke Energy Indiana
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	23	6
Location and fair value amounts of derivatives liabilities	27	1
Duke Energy Indiana | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	23	6
Duke Energy Indiana | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	13	1
Duke Energy Indiana | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	14
Duke Energy Indiana | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	23	6
Location and fair value amounts of derivatives liabilities	13	1
Duke Energy Indiana | Interest Rate Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	14
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	23	6
Duke Energy Indiana | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	13	1
Duke Energy Indiana | Not Designated as Hedging Instruments | Interest Rate Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	14
Piedmont
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	3	1
Location and fair value amounts of derivatives liabilities	139	122
Piedmont | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	3	1
Piedmont | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	21	15
Piedmont | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	118	107
Piedmont | Commodity Contracts
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	3	1
Location and fair value amounts of derivatives liabilities	139	122
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Current Assets
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives assets	3	1
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Current Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	21	15
Piedmont | Not Designated as Hedging Instruments | Commodity Contracts | Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Location and fair value amounts of derivatives liabilities	$ 118	$ 107