Revenues (Tables)

12 Months Ended

Dec. 31, 2021

Disaggregation of Revenue [Line Items]

Disaggregation of Revenues

Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):

	Alliant Energy			IPL			WPL
	2021	2020	2019	2021	2020	2019	2021	2020	2019
Electric Utility:
Retail - residential	$1,115	$1,093	$1,092	$620	$602	$601	$495	$491	$491
Retail - commercial	763	718	770	508	474	510	255	244	260
Retail - industrial	893	841	889	505	488	504	388	353	385
Wholesale	187	168	177	57	57	64	130	111	113
Bulk power and other	123	100	136	62	74	102	61	26	34
Total Electric Utility	3,081	2,920	3,064	1,752	1,695	1,781	1,329	1,225	1,283
Gas Utility:
Retail - residential	257	214	259	146	116	149	111	98	110
Retail - commercial	139	107	133	79	59	75	60	48	58
Retail - industrial	17	12	16	12	8	12	5	4	4
Transportation/other	43	40	47	28	25	28	15	15	19
Total Gas Utility	456	373	455	265	208	264	191	165	191
Other Utility:
Steam	36	36	37	36	36	37	—	—	—
Other utility	13	13	9	10	8	7	3	5	2
Total Other Utility	49	49	46	46	44	44	3	5	2
Non-Utility and Other:
Travero and other	83	74	83	—	—	—	—	—	—
Total Non-Utility and Other	83	74	83	—	—	—	—	—	—
Total revenues	$3,669	$3,416	$3,648	$2,063	$1,947	$2,089	$1,523	$1,395	$1,476

IPL [Member]

Disaggregation of Revenue [Line Items]

Disaggregation of Revenues

Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):

	Alliant Energy			IPL			WPL
	2021	2020	2019	2021	2020	2019	2021	2020	2019
Electric Utility:
Retail - residential	$1,115	$1,093	$1,092	$620	$602	$601	$495	$491	$491
Retail - commercial	763	718	770	508	474	510	255	244	260
Retail - industrial	893	841	889	505	488	504	388	353	385
Wholesale	187	168	177	57	57	64	130	111	113
Bulk power and other	123	100	136	62	74	102	61	26	34
Total Electric Utility	3,081	2,920	3,064	1,752	1,695	1,781	1,329	1,225	1,283
Gas Utility:
Retail - residential	257	214	259	146	116	149	111	98	110
Retail - commercial	139	107	133	79	59	75	60	48	58
Retail - industrial	17	12	16	12	8	12	5	4	4
Transportation/other	43	40	47	28	25	28	15	15	19
Total Gas Utility	456	373	455	265	208	264	191	165	191
Other Utility:
Steam	36	36	37	36	36	37	—	—	—
Other utility	13	13	9	10	8	7	3	5	2
Total Other Utility	49	49	46	46	44	44	3	5	2
Non-Utility and Other:
Travero and other	83	74	83	—	—	—	—	—	—
Total Non-Utility and Other	83	74	83	—	—	—	—	—	—
Total revenues	$3,669	$3,416	$3,648	$2,063	$1,947	$2,089	$1,523	$1,395	$1,476

WPL [Member]

Disaggregation of Revenue [Line Items]

Disaggregation of Revenues

Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):

	Alliant Energy			IPL			WPL
	2021	2020	2019	2021	2020	2019	2021	2020	2019
Electric Utility:
Retail - residential	$1,115	$1,093	$1,092	$620	$602	$601	$495	$491	$491
Retail - commercial	763	718	770	508	474	510	255	244	260
Retail - industrial	893	841	889	505	488	504	388	353	385
Wholesale	187	168	177	57	57	64	130	111	113
Bulk power and other	123	100	136	62	74	102	61	26	34
Total Electric Utility	3,081	2,920	3,064	1,752	1,695	1,781	1,329	1,225	1,283
Gas Utility:
Retail - residential	257	214	259	146	116	149	111	98	110
Retail - commercial	139	107	133	79	59	75	60	48	58
Retail - industrial	17	12	16	12	8	12	5	4	4
Transportation/other	43	40	47	28	25	28	15	15	19
Total Gas Utility	456	373	455	265	208	264	191	165	191
Other Utility:
Steam	36	36	37	36	36	37	—	—	—
Other utility	13	13	9	10	8	7	3	5	2
Total Other Utility	49	49	46	46	44	44	3	5	2
Non-Utility and Other:
Travero and other	83	74	83	—	—	—	—	—	—
Total Non-Utility and Other	83	74	83	—	—	—	—	—	—
Total revenues	$3,669	$3,416	$3,648	$2,063	$1,947	$2,089	$1,523	$1,395	$1,476