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Leases (Operating Leases) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Leases [Line Items]    
Operating leases assets, Property, plant and equipment, net $ 23 $ 16
Operating leases liabilities, Other current liabilities 2 3
Operating leases liabilities, Other liabilities 21 13
Operating leases liabilities, Total $ 23 $ 16
Operating leases, Weighted average remaining lease term 12 years 10 years
Operating leases, Weighted average discount rate, percent 4.00% 4.00%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property, plant and equipment, net Property, plant and equipment, net
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Other
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Other
IPL [Member]    
Leases [Line Items]    
Operating leases assets, Property, plant and equipment, net $ 13 $ 9
Operating leases liabilities, Other current liabilities 1 1
Operating leases liabilities, Other liabilities 12 8
Operating leases liabilities, Total $ 13 $ 9
Operating leases, Weighted average remaining lease term 12 years 11 years
Operating leases, Weighted average discount rate, percent 4.00% 4.00%
WPL [Member]    
Leases [Line Items]    
Operating leases assets, Property, plant and equipment, net $ 9 $ 6
Operating leases liabilities, Other current liabilities 1 1
Operating leases liabilities, Other liabilities 8 5
Operating leases liabilities, Total $ 9 $ 6
Operating leases, Weighted average remaining lease term 12 years 9 years
Operating leases, Weighted average discount rate, percent 4.00% 4.00%