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Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Amortization of regulatory asset | $ 3 | $ 4 | $ 4
Pension Plan | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 176 | 165 |
Service cost | 168 | 157 | 158
Interest cost | 220 | 269 | 317
Expected return on plan assets | (558) | (572) | (567)
Amortization of prior service credit | 133 | 128 | 108
Amortization of prior service cost (credit) | (29) | (32) | (32)
Amortization of settlement charge |  |  | 6
Amortization of settlement charges | 9 | 18 |
Net periodic costs | (49) | (24) | (10)
Pension Plan | Duke Energy Carolinas | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 56 | 51 |
Service cost | 54 | 49 | 49
Interest cost | 51 | 62 | 75
Expected return on plan assets | (141) | (145) | (147)
Amortization of prior service credit | 29 | 28 | 24
Amortization of prior service cost (credit) | (8) | (8) | (8)
Amortization of settlement charge |  |  | 2
Amortization of settlement charges | 5 | 9 |
Net periodic costs | (8) | (3) | (5)
Pension Plan | Progress Energy | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 50 | 48 |
Service cost | 48 | 46 | 46
Interest cost | 70 | 85 | 100
Expected return on plan assets | (187) | (190) | (178)
Amortization of prior service credit | 38 | 41 | 39
Amortization of prior service cost (credit) | (2) | (3) | (3)
Amortization of settlement charge |  |  | 1
Amortization of settlement charges | 2 | 7 |
Net periodic costs | (29) | (12) | 5
Pension Plan | Duke Energy Progress | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 29 | 27 |
Service cost | 28 | 26 | 26
Interest cost | 30 | 38 | 45
Expected return on plan assets | (84) | (87) | (88)
Amortization of prior service credit | 18 | 18 | 15
Amortization of prior service cost (credit) | (1) | (2) | (2)
Amortization of settlement charge |  |  | 1
Amortization of settlement charges | 2 | 6 |
Net periodic costs | (6) |  | (3)
Pension Plan | Duke Energy Florida | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 21 | 21 |
Service cost | 20 | 20 | 20
Interest cost | 39 | 46 | 54
Expected return on plan assets | (102) | (101) | (89)
Amortization of prior service credit | 20 | 23 | 24
Amortization of prior service cost (credit) | (1) | (1) | (1)
Amortization of settlement charges | 1 | 1 |
Net periodic costs | (22) | (11) | 8
Pension Plan | Duke Energy Ohio |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Amortization of regulatory asset | 1 | 2 | 2
Pension Plan | Duke Energy Ohio | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 5 | 5 |
Service cost | 5 | 4 | 4
Interest cost | 13 | 15 | 18
Expected return on plan assets | (28) | (28) | (28)
Amortization of prior service credit | 7 | 6 | 4
Amortization of prior service cost (credit) | (1) |  |
Amortization of settlement charge |  |  | 2
Net periodic costs | (4) | (2) |
Pension Plan | Duke Energy Indiana | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 10 | 9 |
Service cost | 9 | 8 | 9
Interest cost | 18 | 22 | 26
Expected return on plan assets | (40) | (42) | (43)
Amortization of prior service credit | 13 | 12 | 8
Amortization of prior service cost (credit) | (2) | (2) | (2)
Amortization of settlement charges |  | 1 |
Net periodic costs | (1) |  | (2)
Pension Plan | Piedmont | Qualified Plan |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 6 | 6 |
Service cost | 6 | 5 | 5
Interest cost | 7 | 9 | 10
Expected return on plan assets | (20) | (21) | (22)
Amortization of prior service credit | 10 | 9 | 8
Amortization of prior service cost (credit) | (9) | (9) | (9)
Amortization of settlement charges | 1 | 1 |
Net periodic costs | (5) | (5) | (8)
Other Post-Retirement Benefit Plans |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 4 | 4 | 4
Interest cost | 18 | 23 | 30
Expected return on plan assets | (11) | (13) | (12)
Amortization of prior service credit | 2 | 2 | 4
Amortization of prior service cost (credit) | (13) | (14) | (19)
Net periodic costs |  | 2 | 7
Amortization of regulatory asset | 5 | 6 | 6
Other Post-Retirement Benefit Plans | Duke Energy Carolinas |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 1 | 1 | 1
Interest cost | 4 | 5 | 7
Expected return on plan assets | (7) | (8) | (7)
Amortization of prior service credit |  |  | 2
Amortization of prior service cost (credit) | (4) | (4) | (5)
Net periodic costs | (6) | (6) | (2)
Other Post-Retirement Benefit Plans | Progress Energy |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 1 | 1 | 1
Interest cost | 7 | 10 | 12
Amortization of prior service credit | 1 | 1 | 1
Amortization of prior service cost (credit) | (2) | (3) | (8)
Net periodic costs | 7 | 9 | 6
Other Post-Retirement Benefit Plans | Duke Energy Progress |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Interest cost | 4 | 5 | 7
Amortization of prior service cost (credit) | (1) | (1) | (1)
Net periodic costs | 3 | 4 | 6
Other Post-Retirement Benefit Plans | Duke Energy Florida |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost |  |  | 1
Interest cost | 3 | 4 | 5
Amortization of prior service credit | 1 | 1 | 1
Amortization of prior service cost (credit) | (1) | (2) | (7)
Net periodic costs | 3 | 3 |
Other Post-Retirement Benefit Plans | Duke Energy Ohio |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Interest cost | 1 | 1 | 1
Amortization of prior service cost (credit) | (1) | (1) | (1)
Amortization of regulatory asset | 1 | 1 | 2
Other Post-Retirement Benefit Plans | Duke Energy Indiana |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Service cost | 1 | 1 | 1
Interest cost | 1 | 2 | 3
Amortization of prior service credit | 4 | 4 | 4
Amortization of prior service cost (credit) | (1) | (1) | (1)
Net periodic costs | 5 | 6 | 7
Other Post-Retirement Benefit Plans | Piedmont |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |
Interest cost | 1 | 1 | 1
Expected return on plan assets | (2) | (2) | (1)
Amortization of prior service cost (credit) | (2) | (2) | (2)
Net periodic costs | $ (3) | $ (3) | $ (2)

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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 http://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 http://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 http://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 http://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 http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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