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Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | $ 30 | $ 40
Interest cost on projected benefit obligation | 86 | 58
Expected return on plan assets | (147) | (140)
Amortization of actuarial loss | 2 | 24
Amortization of prior service credit | (3) | (5)
Amortization of settlement charges | 5 | 2
Net periodic pension costs | (27) | (21)
Duke Energy Carolinas |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 10 | 12
Interest cost on projected benefit obligation | 21 | 14
Expected return on plan assets | (40) | (38)
Amortization of actuarial loss | 0 | 5
Amortization of prior service credit | 0 | (1)
Amortization of settlement charges | 2 | 1
Net periodic pension costs | (7) | (7)
Progress Energy |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 9 | 12
Interest cost on projected benefit obligation | 27 | 18
Expected return on plan assets | (50) | (46)
Amortization of actuarial loss | 1 | 6
Amortization of settlement charges | 1 | 1
Net periodic pension costs | (12) | (9)
Duke Energy Progress |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 5 | 7
Interest cost on projected benefit obligation | 12 | 8
Expected return on plan assets | (23) | (22)
Amortization of actuarial loss | 0 | 3
Amortization of settlement charges | 1 |
Net periodic pension costs | (5) | (4)
Duke Energy Florida |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 3 | 4
Interest cost on projected benefit obligation | 14 | 10
Expected return on plan assets | (26) | (24)
Amortization of actuarial loss | 1 | 3
Net periodic pension costs | (8) | (7)
Duke Energy Ohio |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 1 | 1
Interest cost on projected benefit obligation | 4 | 3
Expected return on plan assets | (6) | (5)
Amortization of actuarial loss |  | 1
Net periodic pension costs | (1) |
Duke Energy Indiana |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 1 | 2
Interest cost on projected benefit obligation | 7 | 5
Expected return on plan assets | (10) | (9)
Amortization of actuarial loss | 1 | 2
Net periodic pension costs | (1) |
Piedmont |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |
Service cost | 1 | 1
Interest cost on projected benefit obligation | 2 | 2
Expected return on plan assets | (5) | (6)
Amortization of actuarial loss |  | 2
Amortization of prior service credit | (2) | (2)
Amortization of settlement charges | 1 |
Net periodic pension costs | $ (3) | $ (3)

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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