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Stock-Based Compensation (Schedule of Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | $ 64 | $ 61 | $ 65
Pretax stock-based compensation cost | 88 | 84 | 89
Stock-based compensation costs capitalized | 5 | 5 | 5
Stock-based compensation expense | 83 | 79 | 84
Tax benefit associated with stock-based compensation expense | 19 | 18 | 19
RSU awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax stock-based compensation cost | 49 | 46 | 44
Performance awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax stock-based compensation cost | 39 | 38 | 45
Duke Energy Carolinas |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 23 | 22 | 24
Progress Energy |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 24 | 23 | 24
Duke Energy Progress |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 15 | 15 | 15
Duke Energy Florida |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 9 | 9 | 9
Duke Energy Ohio |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 5 | 4 | 5
Duke Energy Indiana |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 6 | 6 | 6
Piedmont |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | $ 3 | $ 3 | $ 3

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