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Revenues
 12 Months Ended
Dec. 31, 2020
Disaggregation of Revenue [Line Items]  
Revenues REVENUES
Revenues from Alliant Energy’s, IPL’s and WPL’s utility businesses are primarily from electric and gas sales provided to customers based on approved tariffs or specific contracts with customers. IPL’s and WPL’s primary performance obligations under such arrangements are to deliver electricity and gas, and their customers simultaneously receive and consume the electricity and gas. For such arrangements, revenues are recognized equivalent to the value of the electricity or gas supplied during each period, including amounts billed during each period and changes in amounts estimated to be billed at the end of each period. IPL and WPL apply the right to invoice method to measure progress towards completing performance obligations to transfer electricity and gas to their customers.

IPL provides retail electric and gas service to customers in Iowa, and WPL provides retail and wholesale electric and retail gas service to customers in Wisconsin. IPL also sells electricity to wholesale customers in Minnesota, Illinois and Iowa, as well as steam from its Prairie Creek Generating Station to high-pressure steam customers in Iowa.

IPL’s and WPL’s retail electric and gas revenues include sales to residential, commercial and industrial customers. IPL’s and WPL’s retail electric and gas customer prices are based on IPL’s and WPL’s cost of service and are determined through general rate review proceedings and various tariff filings with the IUB and PSCW, respectively. Such tariff-based services provide electricity or gas to customers without a defined contractual term.

IPL and WPL have wholesale electric market-based rate authority from FERC allowing them to participate in wholesale energy markets (e.g. MISO) and transact directly with third parties. This authority from FERC allows sales of electricity referred to as bulk power sales based on current market values. FERC also allows IPL and WPL to enter into power supply agreements with municipalities and rural electric cooperatives with defined contractual terms, which include standard pricing mechanisms that are detailed in current tariffs accepted by FERC through wholesale rate review proceedings.

Revenues from Alliant Energy’s non-utility business customers are primarily from its Travero business, which includes a short-line rail freight service in Iowa; a barge, rail and truck freight terminal on the Mississippi River; and freight brokerage and logistics management services.
Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
Alliant EnergyIPLWPL
202020192018202020192018202020192018
Electric Utility:
Retail - residential$1,093 $1,092 $1,063 $602 $601 $590 $491 $491 $473 
Retail - commercial718 770 736 474 510 487 244 260 249 
Retail - industrial841 889 889 488 504 501 353 385 388 
Wholesale168 177 188 57 64 71 111 113 117 
Bulk power and other100 136 124 74 102 82 26 34 42 
Total Electric Utility2,920 3,064 3,000 1,695 1,781 1,731 1,225 1,283 1,269 
Gas Utility:
Retail - residential214 259 254 116 149 152 98 110 102 
Retail - commercial107 133 133 59 75 76 48 58 57 
Retail - industrial12 16 15 8 12 10 4 4 5 
Transportation/other40 47 45 25 28 28 15 19 17 
Total Gas Utility373 455 447 208 264 266 165 191 181 
Other Utility:
Steam36 37 35 36 37 35 — — — 
Other utility13 9 13 8 7 10 5 2 3 
Total Other Utility49 46 48 44 44 45 5 2 3 
Non-Utility and Other:
Travero and other74 83 39 — — — — — — 
Total Non-Utility and Other74 83 39 — — — — — — 
Total revenues$3,416 $3,648 $3,534 $1,947 $2,089 $2,042 $1,395 $1,476 $1,453 
IPL [Member]  
Disaggregation of Revenue [Line Items]  
Revenues REVENUES
Revenues from Alliant Energy’s, IPL’s and WPL’s utility businesses are primarily from electric and gas sales provided to customers based on approved tariffs or specific contracts with customers. IPL’s and WPL’s primary performance obligations under such arrangements are to deliver electricity and gas, and their customers simultaneously receive and consume the electricity and gas. For such arrangements, revenues are recognized equivalent to the value of the electricity or gas supplied during each period, including amounts billed during each period and changes in amounts estimated to be billed at the end of each period. IPL and WPL apply the right to invoice method to measure progress towards completing performance obligations to transfer electricity and gas to their customers.

IPL provides retail electric and gas service to customers in Iowa, and WPL provides retail and wholesale electric and retail gas service to customers in Wisconsin. IPL also sells electricity to wholesale customers in Minnesota, Illinois and Iowa, as well as steam from its Prairie Creek Generating Station to high-pressure steam customers in Iowa.

IPL’s and WPL’s retail electric and gas revenues include sales to residential, commercial and industrial customers. IPL’s and WPL’s retail electric and gas customer prices are based on IPL’s and WPL’s cost of service and are determined through general rate review proceedings and various tariff filings with the IUB and PSCW, respectively. Such tariff-based services provide electricity or gas to customers without a defined contractual term.

IPL and WPL have wholesale electric market-based rate authority from FERC allowing them to participate in wholesale energy markets (e.g. MISO) and transact directly with third parties. This authority from FERC allows sales of electricity referred to as bulk power sales based on current market values. FERC also allows IPL and WPL to enter into power supply agreements with municipalities and rural electric cooperatives with defined contractual terms, which include standard pricing mechanisms that are detailed in current tariffs accepted by FERC through wholesale rate review proceedings.

Revenues from Alliant Energy’s non-utility business customers are primarily from its Travero business, which includes a short-line rail freight service in Iowa; a barge, rail and truck freight terminal on the Mississippi River; and freight brokerage and logistics management services.
Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
Alliant EnergyIPLWPL
202020192018202020192018202020192018
Electric Utility:
Retail - residential$1,093 $1,092 $1,063 $602 $601 $590 $491 $491 $473 
Retail - commercial718 770 736 474 510 487 244 260 249 
Retail - industrial841 889 889 488 504 501 353 385 388 
Wholesale168 177 188 57 64 71 111 113 117 
Bulk power and other100 136 124 74 102 82 26 34 42 
Total Electric Utility2,920 3,064 3,000 1,695 1,781 1,731 1,225 1,283 1,269 
Gas Utility:
Retail - residential214 259 254 116 149 152 98 110 102 
Retail - commercial107 133 133 59 75 76 48 58 57 
Retail - industrial12 16 15 8 12 10 4 4 5 
Transportation/other40 47 45 25 28 28 15 19 17 
Total Gas Utility373 455 447 208 264 266 165 191 181 
Other Utility:
Steam36 37 35 36 37 35 — — — 
Other utility13 9 13 8 7 10 5 2 3 
Total Other Utility49 46 48 44 44 45 5 2 3 
Non-Utility and Other:
Travero and other74 83 39 — — — — — — 
Total Non-Utility and Other74 83 39 — — — — — — 
Total revenues$3,416 $3,648 $3,534 $1,947 $2,089 $2,042 $1,395 $1,476 $1,453 
WPL [Member]  
Disaggregation of Revenue [Line Items]  
Revenues REVENUES
Revenues from Alliant Energy’s, IPL’s and WPL’s utility businesses are primarily from electric and gas sales provided to customers based on approved tariffs or specific contracts with customers. IPL’s and WPL’s primary performance obligations under such arrangements are to deliver electricity and gas, and their customers simultaneously receive and consume the electricity and gas. For such arrangements, revenues are recognized equivalent to the value of the electricity or gas supplied during each period, including amounts billed during each period and changes in amounts estimated to be billed at the end of each period. IPL and WPL apply the right to invoice method to measure progress towards completing performance obligations to transfer electricity and gas to their customers.

IPL provides retail electric and gas service to customers in Iowa, and WPL provides retail and wholesale electric and retail gas service to customers in Wisconsin. IPL also sells electricity to wholesale customers in Minnesota, Illinois and Iowa, as well as steam from its Prairie Creek Generating Station to high-pressure steam customers in Iowa.

IPL’s and WPL’s retail electric and gas revenues include sales to residential, commercial and industrial customers. IPL’s and WPL’s retail electric and gas customer prices are based on IPL’s and WPL’s cost of service and are determined through general rate review proceedings and various tariff filings with the IUB and PSCW, respectively. Such tariff-based services provide electricity or gas to customers without a defined contractual term.

IPL and WPL have wholesale electric market-based rate authority from FERC allowing them to participate in wholesale energy markets (e.g. MISO) and transact directly with third parties. This authority from FERC allows sales of electricity referred to as bulk power sales based on current market values. FERC also allows IPL and WPL to enter into power supply agreements with municipalities and rural electric cooperatives with defined contractual terms, which include standard pricing mechanisms that are detailed in current tariffs accepted by FERC through wholesale rate review proceedings.

Revenues from Alliant Energy’s non-utility business customers are primarily from its Travero business, which includes a short-line rail freight service in Iowa; a barge, rail and truck freight terminal on the Mississippi River; and freight brokerage and logistics management services.
Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
Alliant EnergyIPLWPL
202020192018202020192018202020192018
Electric Utility:
Retail - residential$1,093 $1,092 $1,063 $602 $601 $590 $491 $491 $473 
Retail - commercial718 770 736 474 510 487 244 260 249 
Retail - industrial841 889 889 488 504 501 353 385 388 
Wholesale168 177 188 57 64 71 111 113 117 
Bulk power and other100 136 124 74 102 82 26 34 42 
Total Electric Utility2,920 3,064 3,000 1,695 1,781 1,731 1,225 1,283 1,269 
Gas Utility:
Retail - residential214 259 254 116 149 152 98 110 102 
Retail - commercial107 133 133 59 75 76 48 58 57 
Retail - industrial12 16 15 8 12 10 4 4 5 
Transportation/other40 47 45 25 28 28 15 19 17 
Total Gas Utility373 455 447 208 264 266 165 191 181 
Other Utility:
Steam36 37 35 36 37 35 — — — 
Other utility13 9 13 8 7 10 5 2 3 
Total Other Utility49 46 48 44 44 45 5 2 3 
Non-Utility and Other:
Travero and other74 83 39 — — — — — — 
Total Non-Utility and Other74 83 39 — — — — — — 
Total revenues$3,416 $3,648 $3,534 $1,947 $2,089 $2,042 $1,395 $1,476 $1,453