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Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | $ 41 | $ 44 | $ 81 | $ 88
Interest cost on projected benefit obligation | 59 | 55 | 117 | 110
Expected return on plan assets | (141) | (140) | (281) | (279)
Amortization of actuarial loss | 23 | 34 | 47 | 67
Amortization of prior service credit | (4) | (8) | (9) | (15)
Amortization of settlement charges | 2 | 2 | 4 | 4
Net periodic pension costs | (20) | (13) | (41) | (25)
Duke Energy Carolinas |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 14 | 14 | 26 | 28
Interest cost on projected benefit obligation | 13 | 12 | 27 | 25
Expected return on plan assets | (38) | (35) | (76) | (70)
Amortization of actuarial loss | 5 | 8 | 10 | 15
Amortization of prior service credit | (1) | (2) | (2) | (4)
Amortization of settlement charges | 2 | 2 | 3 | 3
Net periodic pension costs | (5) | (1) | (12) | (3)
Progress Energy |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 11 | 12 | 23 | 25
Interest cost on projected benefit obligation | 18 | 18 | 36 | 35
Expected return on plan assets | (47) | (47) | (93) | (94)
Amortization of actuarial loss | 7 | 9 | 13 | 19
Amortization of prior service credit |  |  |  | (1)
Amortization of settlement charges |  |  | 1 | 1
Net periodic pension costs | (11) | (8) | (20) | (15)
Duke Energy Progress |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 7 | 8 | 14 | 15
Interest cost on projected benefit obligation | 8 | 8 | 16 | 15
Expected return on plan assets | (22) | (21) | (44) | (42)
Amortization of actuarial loss | 4 | 4 | 7 | 9
Amortization of prior service credit |  | (1) |  | (1)
Amortization of settlement charges | 1 | 1 | 1 | 1
Net periodic pension costs | (2) | (1) | (6) | (3)
Duke Energy Florida |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 6 | 6 | 10 | 11
Interest cost on projected benefit obligation | 10 | 9 | 20 | 19
Expected return on plan assets | (24) | (25) | (48) | (51)
Amortization of actuarial loss | 3 | 5 | 6 | 10
Net periodic pension costs | (5) | (5) | (12) | (11)
Duke Energy Ohio |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 1 | 1 | 2 | 2
Interest cost on projected benefit obligation | 3 | 4 | 6 | 7
Expected return on plan assets | (6) | (7) | (11) | (14)
Amortization of actuarial loss | 1 | 1 | 2 | 3
Net periodic pension costs | (1) | (1) | (1) | (2)
Duke Energy Indiana |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 2 | 3 | 4 | 5
Interest cost on projected benefit obligation | 5 | 4 | 10 | 9
Expected return on plan assets | (10) | (10) | (19) | (20)
Amortization of actuarial loss | 3 | 4 | 5 | 7
Amortization of prior service credit | (1) | (1) | (1) | (1)
Net periodic pension costs | (1) |  | (1) |
Piedmont |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 2 | 2 | 3 | 3
Interest cost on projected benefit obligation | 2 | 2 | 4 | 4
Expected return on plan assets | (6) | (5) | (12) | (10)
Amortization of actuarial loss | 1 | 3 | 3 | 5
Amortization of prior service credit | (2) | (4) | (4) | (5)
Net periodic pension costs | $ (3) | $ (2) | $ (6) | $ (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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