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Leases (Tables) | 12 Months Ended
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Dec. 31, 2022
Leases [Line Items] |
Schedule of Lease Details | Operating lease details are as follows (dollars in millions):
| December 31, 2022 |  | December 31, 2021
| Alliant Energy |  | IPL |  | WPL |  | Alliant Energy |  | IPL |  | WPL
Property, plant and equipment, net | $16 |  | $9 |  | $6 |  | $14 |  | $9 |  | $5
Other current liabilities | $3 |  | $1 |  | $1 |  | $2 |  | $1 |  | $1
Other liabilities | 13 |  | 8 |  | 5 |  | 12 |  | 8 |  | 4
Total operating lease liabilities | $16 |  | $9 |  | $6 |  | $14 |  | $9 |  | $5
Weighted average remaining lease term | 10 years |  | 11 years |  | 9 years |  | 9 years |  | 11 years |  | 8 years
Weighted average discount rate | 4% |  | 4% |  | 4% |  | 4% |  | 4% |  | 4%
Finance lease details are as follows (dollars in millions):
| December 31, 2022 |  | December 31, 2021
| Alliant Energy |  |  |  | WPL |  | Alliant Energy |  |  |  | WPL
Property, plant and equipment, net: |  |  |  |  |  |  |  |  |  |  |
Sheboygan Falls Energy Facility | n/a |  |  |  | $15 |  | n/a |  |  |  | $21
Leased land for solar generation | $133 |  |  |  | 133 |  | $11 |  |  |  | 11
| $133 |  |  |  | $148 |  | $11 |  |  |  | $32
Other current liabilities: |  |  |  |  |  |  |  |  |  |  |
Sheboygan Falls Energy Facility | n/a |  |  |  | $12 |  | n/a |  |  |  | $10
Leased land for solar generation | $5 |  |  |  | 5 |  | $1 |  |  |  | 1
| 5 |  |  |  | 17 |  | 1 |  |  |  | 11
Other liabilities: |  |  |  |  |  |  |  |  |  |  |
Sheboygan Falls Energy Facility | n/a |  |  |  | 19 |  | n/a |  |  |  | 31
Leased land for solar generation | 131 |  |  |  | 131 |  | 11 |  |  |  | 11
| 131 |  |  |  | 150 |  | 11 |  |  |  | 42
Total finance lease liabilities | $136 |  |  |  | $167 |  | $12 |  |  |  | $53
Weighted average remaining lease term | 34 years |  |  |  | 28 years |  | 34 years |  |  |  | 10 years
Weighted average discount rate | 5% |  |  |  | 5% |  | 3% |  |  |  | 9%
| Alliant Energy |  |  |  | WPL
| 2022 |  | 2021 |  | 2020 |  |  |  |  |  |  |  | 2022 |  | 2021 |  | 2020
Depreciation and amortization expenses | $— |  |  | $— |  |  | $— |  |  |  |  |  |  |  |  | $6 |  |  | $6 |  |  | $6 |
Interest expense | 3 |  |  | — |  |  | — |  |  |  |  |  |  |  |  | 7 |  |  | 5 |  |  | 6 |
Total finance lease expense | $3 |  |  | $— |  |  | $— |  |  |  |  |  |  |  |  | $13 |  |  | $11 |  |  | $12 |
Schedule of Operating Lease Liability Maturities | As of December 31, 2022, expected maturities of lease liabilities were as follows (in millions):
| 2023 |  | 2024 |  | 2025 |  | 2026 |  | 2027 |  | Thereafter |  | Total |  | Less: amount representing interest |  | Present value of minimum lease payments
Operating Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alliant Energy | $3 |  |  | $2 |  |  | $2 |  |  | $2 |  |  | $2 |  |  | $9 |  | $20 |  | $4 |  | $16
IPL | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 6 |  | 11 |  | 2 |  | 9
WPL | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 2 |  | 7 |  | 1 |  | 6
Finance Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alliant Energy | 5 |  |  | 6 |  |  | 6 |  |  | 6 |  |  | 6 |  |  | 262 |  | 291 |  | 155 |  | 136
WPL | 20 |  |  | 21 |  |  | 12 |  |  | 6 |  |  | 6 |  |  | 262 |  | 327 |  | 160 |  | 167
Schedule of Finance Lease Liability Maturities | As of December 31, 2022, expected maturities of lease liabilities were as follows (in millions):
| 2023 |  | 2024 |  | 2025 |  | 2026 |  | 2027 |  | Thereafter |  | Total |  | Less: amount representing interest |  | Present value of minimum lease payments
Operating Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alliant Energy | $3 |  |  | $2 |  |  | $2 |  |  | $2 |  |  | $2 |  |  | $9 |  | $20 |  | $4 |  | $16
IPL | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 6 |  | 11 |  | 2 |  | 9
WPL | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 2 |  | 7 |  | 1 |  | 6
Finance Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alliant Energy | 5 |  |  | 6 |  |  | 6 |  |  | 6 |  |  | 6 |  |  | 262 |  | 291 |  | 155 |  | 136
WPL | 20 |  |  | 21 |  |  | 12 |  |  | 6 |  |  | 6 |  |  | 262 |  | 327 |  | 160 |  | 167
IPL [Member] |
Leases [Line Items] |
Schedule of Lease Details | Operating lease details are as follows (dollars in millions):
| December 31, 2022 |  | December 31, 2021
| Alliant Energy |  | IPL |  | WPL |  | Alliant Energy |  | IPL |  | WPL
Property, plant and equipment, net | $16 |  | $9 |  | $6 |  | $14 |  | $9 |  | $5
Other current liabilities | $3 |  | $1 |  | $1 |  | $2 |  | $1 |  | $1
Other liabilities | 13 |  | 8 |  | 5 |  | 12 |  | 8 |  | 4
Total operating lease liabilities | $16 |  | $9 |  | $6 |  | $14 |  | $9 |  | $5
Weighted average remaining lease term | 10 years |  | 11 years |  | 9 years |  | 9 years |  | 11 years |  | 8 years
Weighted average discount rate | 4% |  | 4% |  | 4% |  | 4% |  | 4% |  | 4%
Schedule of Operating Lease Liability Maturities | As of December 31, 2022, expected maturities of lease liabilities were as follows (in millions):
| 2023 |  | 2024 |  | 2025 |  | 2026 |  | 2027 |  | Thereafter |  | Total |  | Less: amount representing interest |  | Present value of minimum lease payments
Operating Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alliant Energy | $3 |  |  | $2 |  |  | $2 |  |  | $2 |  |  | $2 |  |  | $9 |  | $20 |  | $4 |  | $16
IPL | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 6 |  | 11 |  | 2 |  | 9
WPL | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 2 |  | 7 |  | 1 |  | 6
Finance Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alliant Energy | 5 |  |  | 6 |  |  | 6 |  |  | 6 |  |  | 6 |  |  | 262 |  | 291 |  | 155 |  | 136
WPL | 20 |  |  | 21 |  |  | 12 |  |  | 6 |  |  | 6 |  |  | 262 |  | 327 |  | 160 |  | 167
WPL [Member] |
Leases [Line Items] |
Schedule of Lease Details | Operating lease details are as follows (dollars in millions):
| December 31, 2022 |  | December 31, 2021
| Alliant Energy |  | IPL |  | WPL |  | Alliant Energy |  | IPL |  | WPL
Property, plant and equipment, net | $16 |  | $9 |  | $6 |  | $14 |  | $9 |  | $5
Other current liabilities | $3 |  | $1 |  | $1 |  | $2 |  | $1 |  | $1
Other liabilities | 13 |  | 8 |  | 5 |  | 12 |  | 8 |  | 4
Total operating lease liabilities | $16 |  | $9 |  | $6 |  | $14 |  | $9 |  | $5
Weighted average remaining lease term | 10 years |  | 11 years |  | 9 years |  | 9 years |  | 11 years |  | 8 years
Weighted average discount rate | 4% |  | 4% |  | 4% |  | 4% |  | 4% |  | 4%
Finance lease details are as follows (dollars in millions):
| December 31, 2022 |  | December 31, 2021
| Alliant Energy |  |  |  | WPL |  | Alliant Energy |  |  |  | WPL
Property, plant and equipment, net: |  |  |  |  |  |  |  |  |  |  |
Sheboygan Falls Energy Facility | n/a |  |  |  | $15 |  | n/a |  |  |  | $21
Leased land for solar generation | $133 |  |  |  | 133 |  | $11 |  |  |  | 11
| $133 |  |  |  | $148 |  | $11 |  |  |  | $32
Other current liabilities: |  |  |  |  |  |  |  |  |  |  |
Sheboygan Falls Energy Facility | n/a |  |  |  | $12 |  | n/a |  |  |  | $10
Leased land for solar generation | $5 |  |  |  | 5 |  | $1 |  |  |  | 1
| 5 |  |  |  | 17 |  | 1 |  |  |  | 11
Other liabilities: |  |  |  |  |  |  |  |  |  |  |
Sheboygan Falls Energy Facility | n/a |  |  |  | 19 |  | n/a |  |  |  | 31
Leased land for solar generation | 131 |  |  |  | 131 |  | 11 |  |  |  | 11
| 131 |  |  |  | 150 |  | 11 |  |  |  | 42
Total finance lease liabilities | $136 |  |  |  | $167 |  | $12 |  |  |  | $53
Weighted average remaining lease term | 34 years |  |  |  | 28 years |  | 34 years |  |  |  | 10 years
Weighted average discount rate | 5% |  |  |  | 5% |  | 3% |  |  |  | 9%
| Alliant Energy |  |  |  | WPL
| 2022 |  | 2021 |  | 2020 |  |  |  |  |  |  |  | 2022 |  | 2021 |  | 2020
Depreciation and amortization expenses | $— |  |  | $— |  |  | $— |  |  |  |  |  |  |  |  | $6 |  |  | $6 |  |  | $6 |
Interest expense | 3 |  |  | — |  |  | — |  |  |  |  |  |  |  |  | 7 |  |  | 5 |  |  | 6 |
Total finance lease expense | $3 |  |  | $— |  |  | $— |  |  |  |  |  |  |  |  | $13 |  |  | $11 |  |  | $12 |
Schedule of Operating Lease Liability Maturities | As of December 31, 2022, expected maturities of lease liabilities were as follows (in millions):
| 2023 |  | 2024 |  | 2025 |  | 2026 |  | 2027 |  | Thereafter |  | Total |  | Less: amount representing interest |  | Present value of minimum lease payments
Operating Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alliant Energy | $3 |  |  | $2 |  |  | $2 |  |  | $2 |  |  | $2 |  |  | $9 |  | $20 |  | $4 |  | $16
IPL | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 6 |  | 11 |  | 2 |  | 9
WPL | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 2 |  | 7 |  | 1 |  | 6
Finance Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alliant Energy | 5 |  |  | 6 |  |  | 6 |  |  | 6 |  |  | 6 |  |  | 262 |  | 291 |  | 155 |  | 136
WPL | 20 |  |  | 21 |  |  | 12 |  |  | 6 |  |  | 6 |  |  | 262 |  | 327 |  | 160 |  | 167
Schedule of Finance Lease Liability Maturities | As of December 31, 2022, expected maturities of lease liabilities were as follows (in millions):
| 2023 |  | 2024 |  | 2025 |  | 2026 |  | 2027 |  | Thereafter |  | Total |  | Less: amount representing interest |  | Present value of minimum lease payments
Operating Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alliant Energy | $3 |  |  | $2 |  |  | $2 |  |  | $2 |  |  | $2 |  |  | $9 |  | $20 |  | $4 |  | $16
IPL | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 6 |  | 11 |  | 2 |  | 9
WPL | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 1 |  |  | 2 |  | 7 |  | 1 |  | 6
Finance Leases: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alliant Energy | 5 |  |  | 6 |  |  | 6 |  |  | 6 |  |  | 6 |  |  | 262 |  | 291 |  | 155 |  | 136
WPL | 20 |  |  | 21 |  |  | 12 |  |  | 6 |  |  | 6 |  |  | 262 |  | 327 |  | 160 |  | 167

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