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Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2024

Defined Benefit Plan Disclosure [Line Items]

Plan Contributions

The following table includes information related to the Duke Energy Registrants' contributions to its qualified defined benefit pension plans.

			Nine Months Ended September 30, 2024 and 2023
									Duke									Duke						Duke						Duke						Duke
			Duke						Energy						Progress			Energy						Energy						Energy						Energy
(in millions)			Energy						Carolinas						Energy			Progress						Florida						Ohio						Indiana						Piedmont
Contributions made:
2024			$	100					$	26					$	23		$	14					$	9					$	5					$	8					$	3
2023			$	100					$	26					$	22		$	13					$	9					$	5					$	8					$	3

Qualified Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Components of Net Periodic Pension Costs

The following tables include the components of net periodic pension costs for qualified pension plans.

			Three Months Ended September 30, 2024
									Duke												Duke						Duke						Duke						Duke
			Duke						Energy						Progress						Energy						Energy						Energy						Energy
(in millions)			Energy						Carolinas						Energy						Progress						Florida						Ohio						Indiana						Piedmont
Service cost			$	28					$	9					$	8					$	5					$	3					$	1					$	1					$	1
Interest cost on projected benefit obligation			82						19						26						12						14						5						6						2
Expected return on plan assets			(154)						(41)						(55)						(25)						(29)						(6)						(10)						(5)
Amortization of actuarial loss			9						2						2						1						1						—						1						1
Amortization of prior service credit			(3)						—						—						—						—						—						—						(1)
Amortization of settlement charges			17						5						7						6						—						2						—						2
Net periodic pension costs			$	(21)					$	(6)					$	(12)					$	(1)					$	(11)					$	2					$	(2)					$	—

			Three Months Ended September 30, 2023
									Duke												Duke						Duke						Duke						Duke
			Duke						Energy						Progress						Energy						Energy						Energy						Energy
(in millions)			Energy						Carolinas						Energy						Progress						Florida						Ohio						Indiana						Piedmont
Service cost			$	28					$	9					$	9					$	5					$	3					$	1					$	1					$	1
Interest cost on projected benefit obligation			86						21						26						12						14						4						6						2
Expected return on plan assets			(147)						(40)						(50)						(24)						(26)						(6)						(10)						(5)
Amortization of actuarial loss			2						—						1						—						1						—						1						—
Amortization of prior service credit			(3)						—						—						—						—						—						—						(1)
Amortization of settlement charges			5						3						1						1						—						—						—						1
Net periodic pension costs			$	(29)					$	(7)					$	(13)					$	(6)					$	(8)					$	(1)					$	(2)					$	(2)

			Nine Months Ended September 30, 2024
									Duke												Duke						Duke						Duke						Duke
			Duke						Energy						Progress						Energy						Energy						Energy						Energy
(in millions)			Energy						Carolinas						Energy						Progress						Florida						Ohio						Indiana						Piedmont
Service cost			$	85					$	28					$	24					$	15					$	10					$	2					$	4					$	3
Interest cost on projected benefit obligation			247						59						78						36						42						13						19						7
Expected return on plan assets			(462)						(122)						(163)						(75)						(87)						(19)						(31)						(15)
Amortization of actuarial loss			25						6						7						4						3						1						3						2
Amortization of prior service credit			(10)						—						—						—						—						—						(1)						(5)
Amortization of settlement charges			26						9						9						8						1						2						1						4
Net periodic pension costs			$	(89)					$	(20)					$	(45)					$	(12)					$	(31)					$	(1)					$	(5)					$	(4)

			Nine Months Ended September 30, 2023
									Duke												Duke						Duke						Duke						Duke
			Duke						Energy						Progress						Energy						Energy						Energy						Energy
(in millions)			Energy						Carolinas						Energy						Progress						Florida						Ohio						Indiana						Piedmont
Service cost			$	87					$	28					$	25					$	15					$	10					$	2					$	4					$	3
Interest cost on projected benefit obligation			258						63						80						37						43						13						20						7
Expected return on plan assets			(441)						(120)						(149)						(70)						(78)						(18)						(30)						(15)
Amortization of actuarial loss			7						1						3						1						2						—						2						—
Amortization of prior service credit			(10)						—						—						—						—						—						(1)						(5)
Amortization of settlement charges			14						7						3						3						1						—						1						3
Net periodic pension costs			$	(85)					$	(21)					$	(38)					$	(14)					$	(22)					$	(3)					$	(4)					$	(7)

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Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

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Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

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