v2.4.0.6

Related Parties | 9 Months Ended
--- | ---
Sep. 30, 2012
Related Party Transaction [Line Items] |
Related Parties | RELATED PARTIES System Coordination and Operating Agreement - IPL and WPL are parties to a system coordination and operating agreement whereby Corporate Services serves as agent on behalf of IPL and WPL. The agreement, which has been approved or reviewed by FERC and all state regulatory bodies having jurisdiction, provides a contractual basis for coordinated planning, construction, operation and maintenance of the interconnected electric generation systems of IPL and WPL. As agent of the agreement, Corporate Services enters into energy, capacity, ancillary services, and transmission sale and purchase transactions. Corporate Services allocates such sales and purchases among IPL and WPL based on procedures included in the agreement. The sales credited to and purchases billed to IPL and WPL for the three and nine months ended September 30 were as follows (in millions):
| IPL |  | WPL
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
| 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011
Sales credited |  | $3 |  |  |  | $6 |  |  |  | $7 |  |  |  | $26 |  |  |  | $4 |  |  |  | $7 |  |  |  | $10 |  |  |  | $23 |
Purchases billed | 87 |  |  | 93 |  |  | 237 |  |  | 238 |  |  | 13 |  |  | 20 |  |  | 50 |  |  | 56 |
Service Agreement - Pursuant to a service agreement, IPL and WPL receive various administrative and general services from an affiliate, Corporate Services. These services are billed to IPL and WPL at cost based on expenses incurred by Corporate Services for the benefit of IPL and WPL, respectively. These costs consisted primarily of employee compensation, benefits and fees associated with various professional services. The amounts billed to IPL and WPL for the three and nine months ended September 30 were as follows (in millions):
| IPL |  | WPL
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
| 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011
Corporate Services billings |  | $34 |  |  |  | $37 |  |  |  | $97 |  |  |  | $117 |  |  |  | $26 |  |  |  | $29 |  |  |  | $76 |  |  |  | $93 |
Net intercompany payables to Corporate Services were as follows (in millions):
| IPL |  | WPL
| September 30, 2012 |  | December 31, 2011 |  | September 30, 2012 |  | December 31, 2011
Net payables to Corporate Services |  | $80 |  |  |  | $82 |  |  |  | $49 |  |  |  | $48 |
ATC - Pursuant to various agreements, WPL receives a range of transmission services from ATC. WPL provides operation, maintenance, and construction services to ATC. WPL and ATC also bill each other for use of shared facilities owned by each party. 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
| 2012 |  | 2011 |  | 2012 |  | 2011
ATC billings to WPL |  | $22 |  |  |  | $23 |  |  |  | $67 |  |  |  | $67 |
WPL billings to ATC | 3 |  |  | 2 |  |  | 7 |  |  | 8 |
WPL owed ATC net amounts of $6 million as of September 30, 2012 and $6 million as of December 31, 2011. IPL’s Sale of Certain Wind Project Assets to Resources - Pursuant to a wind development asset purchase and sale agreement, IPL sold Resources wind project assets for the Franklin County wind project at cost in the second quarter of 2011 for $115.3 million.
IPL [Member] |
Related Party Transaction [Line Items] |
Related Parties | RELATED PARTIES System Coordination and Operating Agreement - IPL and WPL are parties to a system coordination and operating agreement whereby Corporate Services serves as agent on behalf of IPL and WPL. The agreement, which has been approved or reviewed by FERC and all state regulatory bodies having jurisdiction, provides a contractual basis for coordinated planning, construction, operation and maintenance of the interconnected electric generation systems of IPL and WPL. As agent of the agreement, Corporate Services enters into energy, capacity, ancillary services, and transmission sale and purchase transactions. Corporate Services allocates such sales and purchases among IPL and WPL based on procedures included in the agreement. The sales credited to and purchases billed to IPL and WPL for the three and nine months ended September 30 were as follows (in millions):
| IPL |  | WPL
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
| 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011
Sales credited |  | $3 |  |  |  | $6 |  |  |  | $7 |  |  |  | $26 |  |  |  | $4 |  |  |  | $7 |  |  |  | $10 |  |  |  | $23 |
Purchases billed | 87 |  |  | 93 |  |  | 237 |  |  | 238 |  |  | 13 |  |  | 20 |  |  | 50 |  |  | 56 |
Service Agreement - Pursuant to a service agreement, IPL and WPL receive various administrative and general services from an affiliate, Corporate Services. These services are billed to IPL and WPL at cost based on expenses incurred by Corporate Services for the benefit of IPL and WPL, respectively. These costs consisted primarily of employee compensation, benefits and fees associated with various professional services. The amounts billed to IPL and WPL for the three and nine months ended September 30 were as follows (in millions):
| IPL |  | WPL
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
| 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011
Corporate Services billings |  | $34 |  |  |  | $37 |  |  |  | $97 |  |  |  | $117 |  |  |  | $26 |  |  |  | $29 |  |  |  | $76 |  |  |  | $93 |
Net intercompany payables to Corporate Services were as follows (in millions):
| IPL |  | WPL
| September 30, 2012 |  | December 31, 2011 |  | September 30, 2012 |  | December 31, 2011
Net payables to Corporate Services |  | $80 |  |  |  | $82 |  |  |  | $49 |  |  |  | $48 |
ATC - Pursuant to various agreements, WPL receives a range of transmission services from ATC. WPL provides operation, maintenance, and construction services to ATC. WPL and ATC also bill each other for use of shared facilities owned by each party. 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
| 2012 |  | 2011 |  | 2012 |  | 2011
ATC billings to WPL |  | $22 |  |  |  | $23 |  |  |  | $67 |  |  |  | $67 |
WPL billings to ATC | 3 |  |  | 2 |  |  | 7 |  |  | 8 |
WPL owed ATC net amounts of $6 million as of September 30, 2012 and $6 million as of December 31, 2011. IPL’s Sale of Certain Wind Project Assets to Resources - Pursuant to a wind development asset purchase and sale agreement, IPL sold Resources wind project assets for the Franklin County wind project at cost in the second quarter of 2011 for $115.3 million.
WPL [Member] |
Related Party Transaction [Line Items] |
Related Parties | RELATED PARTIES System Coordination and Operating Agreement - IPL and WPL are parties to a system coordination and operating agreement whereby Corporate Services serves as agent on behalf of IPL and WPL. The agreement, which has been approved or reviewed by FERC and all state regulatory bodies having jurisdiction, provides a contractual basis for coordinated planning, construction, operation and maintenance of the interconnected electric generation systems of IPL and WPL. As agent of the agreement, Corporate Services enters into energy, capacity, ancillary services, and transmission sale and purchase transactions. Corporate Services allocates such sales and purchases among IPL and WPL based on procedures included in the agreement. The sales credited to and purchases billed to IPL and WPL for the three and nine months ended September 30 were as follows (in millions):
| IPL |  | WPL
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
| 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011
Sales credited |  | $3 |  |  |  | $6 |  |  |  | $7 |  |  |  | $26 |  |  |  | $4 |  |  |  | $7 |  |  |  | $10 |  |  |  | $23 |
Purchases billed | 87 |  |  | 93 |  |  | 237 |  |  | 238 |  |  | 13 |  |  | 20 |  |  | 50 |  |  | 56 |
Service Agreement - Pursuant to a service agreement, IPL and WPL receive various administrative and general services from an affiliate, Corporate Services. These services are billed to IPL and WPL at cost based on expenses incurred by Corporate Services for the benefit of IPL and WPL, respectively. These costs consisted primarily of employee compensation, benefits and fees associated with various professional services. The amounts billed to IPL and WPL for the three and nine months ended September 30 were as follows (in millions):
| IPL |  | WPL
| Three Months |  | Nine Months |  | Three Months |  | Nine Months
| 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011 |  | 2012 |  | 2011
Corporate Services billings |  | $34 |  |  |  | $37 |  |  |  | $97 |  |  |  | $117 |  |  |  | $26 |  |  |  | $29 |  |  |  | $76 |  |  |  | $93 |
Net intercompany payables to Corporate Services were as follows (in millions):
| IPL |  | WPL
| September 30, 2012 |  | December 31, 2011 |  | September 30, 2012 |  | December 31, 2011
Net payables to Corporate Services |  | $80 |  |  |  | $82 |  |  |  | $49 |  |  |  | $48 |
ATC - Pursuant to various agreements, WPL receives a range of transmission services from ATC. WPL provides operation, maintenance, and construction services to ATC. WPL and ATC also bill each other for use of shared facilities owned by each party. 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
| 2012 |  | 2011 |  | 2012 |  | 2011
ATC billings to WPL |  | $22 |  |  |  | $23 |  |  |  | $67 |  |  |  | $67 |
WPL billings to ATC | 3 |  |  | 2 |  |  | 7 |  |  | 8 |
WPL owed ATC net amounts of $6 million as of September 30, 2012 and $6 million as of December 31, 2011. IPL’s Sale of Certain Wind Project Assets to Resources - Pursuant to a wind development asset purchase and sale agreement, IPL sold Resources wind project assets for the Franklin County wind project at cost in the second quarter of 2011 for $115.3 million.

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

X
- Definition The entire disclosure for related party transactions, including the nature of the relationship(s), a description of the transactions, the amount of the transactions, the effects of any change in the method of establishing the terms of the transaction from the previous period, stated interest rate, expiration date, terms and manner of settlement per the agreement with the related party, and amounts due to or from related parties. If the entity and one or more other entities are under common ownership or management control and this control affects the operating results or financial position, disclosure includes the nature of the control relationship even if there are no transactions between the entities. Disclosure may also include the aggregate amount of current and deferred tax expense for each statement of earnings presented where the entity is a member of a group that files a consolidated tax return, the amount of any tax related balances due to or from affiliates as of the date of each statement of financial position presented, the principal provisions of the method by which the consolidated amount of current and deferred tax expense is allocated to the members of the group and the nature and effect of any changes in that method. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 3A -Section 04 -Paragraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 57 -Paragraph 1-4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39678-107864 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph k Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39691-107864 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 + Details
Name: | us-gaap_RelatedPartyTransactionsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration