Employee Benefit Plans (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Remeasurement gain (loss) recognized	$ (276)
Increase (decrease) in plan assets	1,198
Increase in projected benefit obligation	922
Regulatory Assets, Noncurrent
Defined Benefit Plan Disclosure [Line Items]
Remeasurement gain (loss) recognized	(266)
Accumulated Other Comprehensive Income (Loss), Net of Tax
Defined Benefit Plan Disclosure [Line Items]
Remeasurement gain (loss) recognized	$ (10)
Duke Energy RCBP
Defined Benefit Plan Disclosure [Line Items]
Discount rate (as a percent)	5.70%
Cash balance interest crediting rate (as a percent)	4.50%
Settlement charge	$ 66
Duke Energy RCBP | Other Nonoperating Income (Expense)
Defined Benefit Plan Disclosure [Line Items]
Settlement charge	11
Duke Energy RCBP | Duke Energy Carolinas
Defined Benefit Plan Disclosure [Line Items]
Settlement charge	28
Duke Energy RCBP | Duke Energy Progress
Defined Benefit Plan Disclosure [Line Items]
Settlement charge	16
Duke Energy RCBP | Duke Energy Florida
Defined Benefit Plan Disclosure [Line Items]
Settlement charge	5
Duke Energy RCBP | Duke Energy Indiana
Defined Benefit Plan Disclosure [Line Items]
Settlement charge	4
Duke Energy RCBP | Duke Energy Ohio
Defined Benefit Plan Disclosure [Line Items]
Settlement charge	2
Duke Energy RCBP | Piedmont
Defined Benefit Plan Disclosure [Line Items]
Settlement charge	11
Regulatory Assets, Noncurrent | Noncurrent assets
Defined Benefit Plan Disclosure [Line Items]
Settlement charge	$ 55