XML 73 R36.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Related Parties (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2014
Related Party Transactions [Line Items] |
Services Provided, Sales Credited And Purchases Billed | The amounts billed for services provided, sales credited and purchases billed for the three and nine months ended September 30 were as follows (in millions):
| IPL |  | WPL
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Corporate Services billings |  | $37 |  |  |  | $39 |  |  |  | $111 |  |  |  | $107 |  |  |  | $30 |  |  |  | $28 |  |  |  | $89 |  |  |  | $77 |
Sales credited | 2 |  |  | 2 |  |  | 6 |  |  | 5 |  |  | 2 |  |  | 3 |  |  | 4 |  |  | 10 |
Purchases billed | 106 |  |  | 108 |  |  | 313 |  |  | 260 |  |  | 34 |  |  | 16 |  |  | 92 |  |  | 44 |
Net Intercompany Payables | Net intercompany payables to Corporate Services were as follows (in millions):
| IPL |  | WPL
| September 30, 2014 |  | December 31, 2013 |  | September 30, 2014 |  | December 31, 2013
Net payables to Corporate Services | $87 |  | $62 |  | $54 |  | $46
Related Amounts Billed Between Parties | The related amounts billed between the parties for the three and nine months ended September 30 were as follows (in millions):
| Three Months |  | Nine Months
| 2014 |  | 2013 |  | 2014 |  | 2013
ATC billings to WPL |  | $24 |  |  |  | $24 |  |  |  | $72 |  |  |  | $72 |
WPL billings to ATC | 3 |  |  | 2 |  |  | 7 |  |  | 9 |
IPL [Member] |
Related Party Transactions [Line Items] |
Services Provided, Sales Credited And Purchases Billed | The amounts billed for services provided, sales credited and purchases billed for the three and nine months ended September 30 were as follows (in millions):
| IPL |  | WPL
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Corporate Services billings |  | $37 |  |  |  | $39 |  |  |  | $111 |  |  |  | $107 |  |  |  | $30 |  |  |  | $28 |  |  |  | $89 |  |  |  | $77 |
Sales credited | 2 |  |  | 2 |  |  | 6 |  |  | 5 |  |  | 2 |  |  | 3 |  |  | 4 |  |  | 10 |
Purchases billed | 106 |  |  | 108 |  |  | 313 |  |  | 260 |  |  | 34 |  |  | 16 |  |  | 92 |  |  | 44 |
Net Intercompany Payables | Net intercompany payables to Corporate Services were as follows (in millions):
| IPL |  | WPL
| September 30, 2014 |  | December 31, 2013 |  | September 30, 2014 |  | December 31, 2013
Net payables to Corporate Services | $87 |  | $62 |  | $54 |  | $46
WPL [Member] |
Related Party Transactions [Line Items] |
Services Provided, Sales Credited And Purchases Billed | The amounts billed for services provided, sales credited and purchases billed for the three and nine months ended September 30 were as follows (in millions):
| IPL |  | WPL
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Corporate Services billings |  | $37 |  |  |  | $39 |  |  |  | $111 |  |  |  | $107 |  |  |  | $30 |  |  |  | $28 |  |  |  | $89 |  |  |  | $77 |
Sales credited | 2 |  |  | 2 |  |  | 6 |  |  | 5 |  |  | 2 |  |  | 3 |  |  | 4 |  |  | 10 |
Purchases billed | 106 |  |  | 108 |  |  | 313 |  |  | 260 |  |  | 34 |  |  | 16 |  |  | 92 |  |  | 44 |
Net Intercompany Payables | Net intercompany payables to Corporate Services were as follows (in millions):
| IPL |  | WPL
| September 30, 2014 |  | December 31, 2013 |  | September 30, 2014 |  | December 31, 2013
Net payables to Corporate Services | $87 |  | $62 |  | $54 |  | $46
Related Amounts Billed Between Parties | The related amounts billed between the parties for the three and nine months ended September 30 were as follows (in millions):
| Three Months |  | Nine Months
| 2014 |  | 2013 |  | 2014 |  | 2013
ATC billings to WPL |  | $24 |  |  |  | $24 |  |  |  | $72 |  |  |  | $72 |
WPL billings to ATC | 3 |  |  | 2 |  |  | 7 |  |  | 9 |

X
- Definition Schedule of amounts billed for ATC (Table Text Block) + References No definition available. + Details
Name: | lnt_ScheduleOfAtcBillingsTableTextBlock
Namespace Prefix: | lnt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of Corporate Services Intercompany Payables (Table Text Block). + References No definition available. + Details
Name: | lnt_ScheduleOfCorporateServicesIntercompanyPayablesTableTextBlock
Namespace Prefix: | lnt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of System Coordination and Operating Agreement Schedule of Sales Credited and Purchases Billed (Table Text Block) + References No definition available. + Details
Name: | lnt_ScheduleOfScoaSalesCreditedAndPurchasesBilledTableTextBlock
Namespace Prefix: | lnt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration