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Property, Plant and Equipment (Property, Plant and Equipment) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Electric plant anticipated to be retired early $ 1,269 $ 0
Total electric plant 16,243 13,865
Gas plant in service 1,563 1,463
Other plant in service 534 520
Accumulated depreciation (4,868) (4,602)
Net plant 13,472 11,246
Construction work in progress 405 1,835
Other, net 7 6
Total utility 13,884 13,087
Non-utility Generation, net 79 83
Corporate Services and other, net 373 357
Total non-utility and other 452 440
Total property, plant and equipment 14,336 13,527
Non-utility Generation, accumulated depreciation 63 59
Corporate Services and other, accumulated depreciation 210 172
Generation [Member]    
Property, Plant and Equipment [Line Items]    
Electric plant in service 8,222 7,625
Distribution [Member]    
Property, Plant and Equipment [Line Items]    
Electric plant in service 6,216 5,783
Other [Member]    
Property, Plant and Equipment [Line Items]    
Electric plant in service 536 457
IPL [Member]    
Property, Plant and Equipment [Line Items]    
Electric plant anticipated to be retired early 459 0
Total electric plant 9,171 7,921
Gas plant in service 844 802
Other plant in service 354 345
Accumulated depreciation (2,671) (2,499)
Net plant 7,698 6,569
Construction work in progress 185 907
Other, net 6 5
Total utility 7,889 7,481
Total property, plant and equipment 7,889 7,481
IPL [Member] | Generation [Member]    
Property, Plant and Equipment [Line Items]    
Electric plant in service 4,884 4,432
IPL [Member] | Distribution [Member]    
Property, Plant and Equipment [Line Items]    
Electric plant in service 3,470 3,190
IPL [Member] | Other [Member]    
Property, Plant and Equipment [Line Items]    
Electric plant in service 358 299
WPL [Member]    
Property, Plant and Equipment [Line Items]    
Electric plant anticipated to be retired early 810 0
Total electric plant 7,072 5,944
Gas plant in service 719 661
Other plant in service 180 175
Accumulated depreciation (2,197) (2,103)
Net plant 5,774 4,677
Leased Sheboygan Falls Energy Facility, net 27 32
Construction work in progress 220 928
Other, net 1 1
Total utility 6,022 5,638
Total property, plant and equipment 6,022 5,638
Leased Sheboygan Falls Energy Facility, accumulated depreciation 95 89
WPL [Member] | Generation [Member]    
Property, Plant and Equipment [Line Items]    
Electric plant in service 3,338 3,193
WPL [Member] | Distribution [Member]    
Property, Plant and Equipment [Line Items]    
Electric plant in service 2,746 2,593
WPL [Member] | Other [Member]    
Property, Plant and Equipment [Line Items]    
Electric plant in service $ 178 $ 158