Revenues

3 Months Ended

Mar. 31, 2021

Disaggregation of Revenue [Line Items]

Revenues from Contracts with Customers

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
Three Months Ended March 31	2021	2020	2021	2020	2021	2020
Electric Utility:
Retail - residential	$262	$266	$139	$147	$123	$119
Retail - commercial	172	183	110	120	62	63
Retail - industrial	202	210	112	121	90	89
Wholesale	40	40	11	14	29	26
Bulk power and other	25	31	14	23	11	8
Total Electric Utility	701	730	386	425	315	305
Gas Utility:
Retail - residential	99	91	52	49	47	42
Retail - commercial	53	45	27	24	26	21
Retail - industrial	5	4	3	2	2	2
Transportation/other	13	12	9	8	4	4
Total Gas Utility	170	152	91	83	79	69
Other Utility:
Steam	9	10	9	10	—	—
Other utility	4	2	3	1	1	1
Total Other Utility	13	12	12	11	1	1
Non-Utility and Other:
Transportation and other	17	22	—	—	—	—
Total Non-Utility and Other	17	22	—	—	—	—
Total revenues	$901	$916	$489	$519	$395	$375

IPL [Member]

Disaggregation of Revenue [Line Items]

Revenues from Contracts with Customers

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
Three Months Ended March 31	2021	2020	2021	2020	2021	2020
Electric Utility:
Retail - residential	$262	$266	$139	$147	$123	$119
Retail - commercial	172	183	110	120	62	63
Retail - industrial	202	210	112	121	90	89
Wholesale	40	40	11	14	29	26
Bulk power and other	25	31	14	23	11	8
Total Electric Utility	701	730	386	425	315	305
Gas Utility:
Retail - residential	99	91	52	49	47	42
Retail - commercial	53	45	27	24	26	21
Retail - industrial	5	4	3	2	2	2
Transportation/other	13	12	9	8	4	4
Total Gas Utility	170	152	91	83	79	69
Other Utility:
Steam	9	10	9	10	—	—
Other utility	4	2	3	1	1	1
Total Other Utility	13	12	12	11	1	1
Non-Utility and Other:
Transportation and other	17	22	—	—	—	—
Total Non-Utility and Other	17	22	—	—	—	—
Total revenues	$901	$916	$489	$519	$395	$375

WPL [Member]

Disaggregation of Revenue [Line Items]

Revenues from Contracts with Customers

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
Three Months Ended March 31	2021	2020	2021	2020	2021	2020
Electric Utility:
Retail - residential	$262	$266	$139	$147	$123	$119
Retail - commercial	172	183	110	120	62	63
Retail - industrial	202	210	112	121	90	89
Wholesale	40	40	11	14	29	26
Bulk power and other	25	31	14	23	11	8
Total Electric Utility	701	730	386	425	315	305
Gas Utility:
Retail - residential	99	91	52	49	47	42
Retail - commercial	53	45	27	24	26	21
Retail - industrial	5	4	3	2	2	2
Transportation/other	13	12	9	8	4	4
Total Gas Utility	170	152	91	83	79	69
Other Utility:
Steam	9	10	9	10	—	—
Other utility	4	2	3	1	1	1
Total Other Utility	13	12	12	11	1	1
Non-Utility and Other:
Transportation and other	17	22	—	—	—	—
Total Non-Utility and Other	17	22	—	—	—	—
Total revenues	$901	$916	$489	$519	$395	$375