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Condensed Consolidated Balance Sheets - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Current assets:    
Cash and cash equivalents $ 503 $ 81
Short-term investments 250 0
Accounts receivable, less allowance for expected credit losses 485 427
Production fuel, at weighted average cost 37 54
Gas stored underground, at weighted average cost 55 55
Materials and supplies, at weighted average cost 189 186
Regulatory assets 132 210
Other 193 171
Total current assets 1,844 1,184
Property, plant and equipment, net 19,813 18,701
Investments:    
ATC Holdings 459 415
Other 230 224
Total investments 689 639
Other assets:    
Regulatory assets 2,171 2,064
Deferred charges and other 110 126
Total other assets 2,281 2,190
Total assets 24,627 22,714
Current liabilities:    
Current maturities of long-term debt 1,074 1,171
Commercial paper 192 558
Accounts payable 550 532
Regulatory liabilities 58 69
Other 360 385
Total current liabilities 2,234 2,715
Long-term debt, net (excluding current portion) 10,655 8,677
Other liabilities:    
Deferred tax liabilities 2,187 2,188
Regulatory liabilities 1,076 959
Pension and other benefit obligations 197 224
Other 971 947
Total other liabilities 4,431 4,318
Commitments and contingencies (Note 13)
Common equity:    
Common stock 3 3
Additional paid-in capital 3,087 3,060
Retained earnings 4,231 3,954
Accumulated other comprehensive income (loss) 0 1
Shares in deferred compensation trust - 359,483 and 372,116 shares at a weighted average cost of $38.39 and $36.56 per share (14) (14)
Total common equity 7,307 7,004
Total liabilities and equity 24,627 22,714
IPL [Member]    
Current assets:    
Cash and cash equivalents 209 29
Accounts receivable, less allowance for expected credit losses 252 192
Production fuel, at weighted average cost 16 30
Gas stored underground, at weighted average cost 26 25
Materials and supplies, at weighted average cost 111 113
Regulatory assets 68 77
Other 58 43
Total current assets 740 509
Property, plant and equipment, net 10,083 9,336
Other assets:    
Regulatory assets 1,564 1,509
Deferred charges and other 46 53
Total other assets 1,610 1,562
Total assets 12,433 11,407
Current liabilities:    
Current maturities of long-term debt 0 300
Commercial paper 0 50
Accounts payable 289 263
Accounts payable to associated companies 52 47
Accrued taxes 74 77
Accrued interest 49 48
Regulatory liabilities 39 54
Other 78 89
Total current liabilities 581 928
Long-term debt, net (excluding current portion) 4,679 3,790
Other liabilities:    
Deferred tax liabilities 1,235 1,179
Regulatory liabilities 519 492
Pension and other benefit obligations 42 46
Other 527 511
Total other liabilities 2,323 2,228
Commitments and contingencies (Note 13)
Common equity:    
Common stock 33 33
Additional paid-in capital 3,497 3,212
Retained earnings 1,320 1,216
Total common equity 4,850 4,461
Total liabilities and equity 12,433 11,407
WPL [Member]    
Current assets:    
Cash and cash equivalents 11 51
Accounts receivable, less allowance for expected credit losses 218 220
Production fuel, at weighted average cost 21 24
Gas stored underground, at weighted average cost 29 30
Materials and supplies, at weighted average cost 72 69
Regulatory assets 64 133
Prepaid gross receipts tax 38 51
Other 53 57
Total current assets 506 635
Property, plant and equipment, net 9,166 8,861
Other assets:    
Regulatory assets 607 555
Deferred charges and other 52 55
Total other assets 659 610
Total assets 10,331 10,106
Current liabilities:    
Commercial paper 192 183
Accounts payable 189 209
Accrued interest 41 44
Regulatory liabilities 19 15
Other 86 94
Total current liabilities 527 545
Long-term debt, net (excluding current portion) 3,372 3,370
Other liabilities:    
Deferred tax liabilities 786 865
Regulatory liabilities 557 467
Pension and other benefit obligations 85 102
Other 665 656
Total other liabilities 2,093 2,090
Commitments and contingencies (Note 13)
Common equity:    
Common stock 66 66
Additional paid-in capital 2,613 2,533
Retained earnings 1,660 1,502
Total common equity 4,339 4,101
Total liabilities and equity $ 10,331 $ 10,106