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Summary of Significant Accounting Policies Property, Plant, and Equipment (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Software | Minimum |  |  |
Property, plant, and equipment |  |  |
Estimated useful life | 3 years |  |
Software | Maximum |  |  |
Property, plant, and equipment |  |  |
Estimated useful life | 15 years |  |
WECI Wind Generating Facility | Maximum |  |  |
Property, plant, and equipment |  |  |
Estimated useful life | 30 years |  |
WECI Solar Generating Facility | Maximum |  |  |
Property, plant, and equipment |  |  |
Estimated useful life | 35 years |  |
PWGS | Minimum |  |  |
Property, plant, and equipment |  |  |
Estimated useful life | 10 years |  |
PWGS | Maximum |  |  |
Property, plant, and equipment |  |  |
Estimated useful life | 45 years |  |
ERGS | Minimum |  |  |
Property, plant, and equipment |  |  |
Estimated useful life | 10 years |  |
ERGS | Maximum |  |  |
Property, plant, and equipment |  |  |
Estimated useful life | 55 years |  |
WE |  |  |
Property, plant, and equipment |  |  |
Annual utility composite depreciation rate (as a percent) | 3.03% | 3.06% | 3.09%
WPS |  |  |
Property, plant, and equipment |  |  |
Annual utility composite depreciation rate (as a percent) | 2.93% | 2.67% | 2.66%
WG |  |  |
Property, plant, and equipment |  |  |
Annual utility composite depreciation rate (as a percent) | 2.61% | 2.47% | 2.44%
PGL |  |  |
Property, plant, and equipment |  |  |
Annual utility composite depreciation rate (as a percent) | 3.13% | 3.13% | 3.12%
NSG |  |  |
Property, plant, and equipment |  |  |
Annual utility composite depreciation rate (as a percent) | 2.46% | 2.43% | 2.52%
MERC |  |  |
Property, plant, and equipment |  |  |
Annual utility composite depreciation rate (as a percent) | 2.60% | 2.56% | 2.58%
MGU |  |  |
Property, plant, and equipment |  |  |
Annual utility composite depreciation rate (as a percent) | 2.73% | 2.75% | 2.70%
UMERC |  |  |
Property, plant, and equipment |  |  |
Annual utility composite depreciation rate (as a percent) | 2.97% | 3.01% | 2.94%

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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