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Segments Of Business (Schedule Of Segment Of Business) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Revenues $ 3,669 $ 3,416 $ 3,648
Depreciation and amortization 657 615 567
Operating income (loss) 795 740 778
Interest expense 277 275 273
Equity income from unconsolidated investments, net (62) (61) (53)
Income tax expense (benefit) (74) (57) 69
Net income attributable to common shareowners 659 614 557
Total assets 18,553 17,710 16,701
Investments in equity method subsidiaries 508 476 458
Construction and acquisition expenditures 1,169 1,366 1,640
IPL [Member]      
Segment Reporting Information [Line Items]      
Revenues 2,063 1,947 2,089
Operating income (loss) 460 410 403
Interest expense 139 139 127
Income tax expense (benefit) (36) (47) 24
Net income attributable to common shareowners 350 324 284
Total assets 9,996 9,849  
WPL [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,523 1,395 1,476
Operating income (loss) 308 306 347
Interest expense 105 104 102
Income tax expense (benefit) (51) (19) 49
Total assets 7,518 6,912  
Electric [Member]      
Segment Reporting Information [Line Items]      
Revenues 3,081 2,920 3,064
Depreciation and amortization 591 556 513
Operating income (loss) 716 643 679
Equity income from unconsolidated investments, net (2) (2) (1)
Total assets 14,924 14,358 13,659
Investments in equity method subsidiaries 17 11 9
Construction and acquisition expenditures 980 1,109 1,439
Electric [Member] | IPL [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,752 1,695 1,781
Depreciation and amortization 338 321 295
Operating income (loss) 420 358 360
Total assets 8,602 8,518 8,075
Construction and acquisition expenditures 342 626 964
Electric [Member] | WPL [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,329 1,225 1,283
Depreciation and amortization 253 235 218
Operating income (loss) 296 285 319
Total assets 6,322 5,840 5,584
Construction and acquisition expenditures 638 483 475
Gas [Member]      
Segment Reporting Information [Line Items]      
Revenues 456 373 455
Depreciation and amortization 54 49 47
Operating income (loss) 63 74 70
Equity income from unconsolidated investments, net 0 0 0
Total assets 1,487 1,413 1,269
Investments in equity method subsidiaries 0 0 0
Construction and acquisition expenditures 90 182 100
Gas [Member] | IPL [Member]      
Segment Reporting Information [Line Items]      
Revenues 265 208 264
Depreciation and amortization 31 30 29
Operating income (loss) 43 50 39
Total assets 819 766 734
Construction and acquisition expenditures 42 59 56
Gas [Member] | WPL [Member]      
Segment Reporting Information [Line Items]      
Revenues 191 165 191
Depreciation and amortization 23 19 18
Operating income (loss) 20 24 31
Total assets 668 647 535
Construction and acquisition expenditures 48 123 44
Other Utility [Member]      
Segment Reporting Information [Line Items]      
Revenues 49 49 46
Depreciation and amortization 6 5 3
Operating income (loss) (11) (1) 1
Equity income from unconsolidated investments, net 0 0 0
Total assets 1,103 990 856
Investments in equity method subsidiaries 0 0 0
Construction and acquisition expenditures 0 2 0
Other Utility [Member] | IPL [Member]      
Segment Reporting Information [Line Items]      
Revenues 46 44 44
Depreciation and amortization 6 5 3
Operating income (loss) (3) 2 4
Total assets 575 565 468
Construction and acquisition expenditures 0 2 0
Other Utility [Member] | WPL [Member]      
Segment Reporting Information [Line Items]      
Revenues 3 5 2
Depreciation and amortization 0 0 0
Operating income (loss) (8) (3) (3)
Total assets 528 425 388
Construction and acquisition expenditures 0 0 0
Utility Business [Member]      
Segment Reporting Information [Line Items]      
Revenues 3,586 3,342 3,565
Depreciation and amortization 651 610 563
Operating income (loss) 768 716 750
Interest expense 244 243 229
Equity income from unconsolidated investments, net (2) (2) (1)
Income tax expense (benefit) (87) (66) 73
Net income attributable to common shareowners 618 573 517
Total assets 17,514 16,761 15,784
Investments in equity method subsidiaries 17 11 9
Construction and acquisition expenditures 1,070 1,293 1,539
Utility Business [Member] | IPL [Member]      
Segment Reporting Information [Line Items]      
Revenues 2,063 1,947 2,089
Depreciation and amortization 375 356 327
Operating income (loss) 460 410 403
Interest expense 139 139 127
Income tax expense (benefit) (36) (47) 24
Net income attributable to common shareowners 350 324 284
Total assets 9,996 9,849 9,277
Construction and acquisition expenditures 384 687 1,020
Utility Business [Member] | WPL [Member]      
Segment Reporting Information [Line Items]      
Revenues 1,523 1,395 1,476
Depreciation and amortization 276 254 236
Operating income (loss) 308 306 347
Interest expense 105 104 102
Income tax expense (benefit) (51) (19) 49
Net income attributable to common shareowners 268 249 233
Total assets 7,518 6,912 6,507
Construction and acquisition expenditures 686 606 519
Non-Utility [Member]      
Segment Reporting Information [Line Items]      
Revenues 83 74 83
Depreciation and amortization 6 5 4
Operating income (loss) 27 24 28
Interest expense 33 32 44
Equity income from unconsolidated investments, net (60) (59) (52)
Income tax expense (benefit) 13 9 (4)
Net income attributable to common shareowners 41 41 40
Total assets 1,039 949 917
Investments in equity method subsidiaries 491 465 449
Construction and acquisition expenditures $ 99 $ 73 $ 101