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Regulatory Matters (Other Regulatory Matters) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Sep. 02, 2014
Public Utilities, General Disclosures [Line Items]
Income (Loss) from Equity Method Investments	$ 1,968	$ (44)	$ 1,924	$ (87)
Current Liabilities: Other	2,898		2,898			$ 2,367
Income tax benefit	(316)	141	(179)	236
Asset retirement obligations	729		729			881
Public utilities, property, plant and equipment, net	104,325		104,325			102,127
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Current Liabilities: Other	488		488			611
Income tax benefit	37	74	102	137
Asset retirement obligations	194		194			206
Public utilities, property, plant and equipment, net	32,970		32,970			32,397
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Current Liabilities: Other	468		468			478
Income tax benefit	26	$ 33	68	$ 77
Asset retirement obligations	357		357			485
Public utilities, property, plant and equipment, net	22,845		22,845			$ 22,934
Generation facilities evaluated for retirement \| Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	693		693
Generation facilities evaluated for retirement \| Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	1,200		1,200
ACP
Public Utilities, General Disclosures [Line Items]
Current Liabilities: Other	920		920
ACP \| ACP
Public Utilities, General Disclosures [Line Items]
Income (Loss) from Equity Method Investments	2,000		(2,000)
Current Liabilities: Other	920		920
Income tax benefit			374
Expected costs (less than)	100		100
ACP
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage							47.00%
Dominion resources \| ACP
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage					53.00%
Southern Company Gas \| ACP
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage							5.00%
Current liabilities \| ACP \| ACP
Public Utilities, General Disclosures [Line Items]
Asset retirement obligations	60		60
Guarantees of outstanding debt	$ 860		$ 860