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Commitments And Contingencies (Tables) | 3 Months Ended
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Mar. 31, 2014
Long-term Purchase Commitment [Line Items] |
Operating Expense Purchase Obligations | At March 31, 2014, minimum future commitments related to these operating expense purchase obligations were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Purchased power (a): |  |  |  |  |
DAEC (IPL) |  | $1,619 |  |  |  | $1,619 |  |  |  | $— |
Other | 247 |  |  | 1 |  |  | 246 |
| 1,866 |  |  | 1,620 |  |  | 246 |
Natural gas | 276 |  |  | 146 |  |  | 130 |
Coal (b) | 309 |  |  | 134 |  |  | 175 |
SO2 emission allowances | 34 |  |  | 34 |  |  | — |
Other (c) | 33 |  |  | 21 |  |  | 9 |
|  | $2,518 |  |  |  | $1,955 |  |  |  | $560 |
(a) | Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased.
(b) | Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of March 31, 2014 regarding expected future usage, which is subject to change.
(c) | Includes individual commitments incurred during the normal course of business that exceeded $1 million at March 31, 2014.
MGP Site Estimated Future Costs And Recorded Liabilities | At March 31, 2014, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Range of estimated future costs |  | $14 |  | - | $33 |  |  | $13 |  | - | $31 |  |  | $1 |  | - | $2
Current and non-current environmental liabilities | 21 |  | 19 |  | 2
IPL [Member] |
Long-term Purchase Commitment [Line Items] |
Operating Expense Purchase Obligations | At March 31, 2014, minimum future commitments related to these operating expense purchase obligations were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Purchased power (a): |  |  |  |  |
DAEC (IPL) |  | $1,619 |  |  |  | $1,619 |  |  |  | $— |
Other | 247 |  |  | 1 |  |  | 246 |
| 1,866 |  |  | 1,620 |  |  | 246 |
Natural gas | 276 |  |  | 146 |  |  | 130 |
Coal (b) | 309 |  |  | 134 |  |  | 175 |
SO2 emission allowances | 34 |  |  | 34 |  |  | — |
Other (c) | 33 |  |  | 21 |  |  | 9 |
|  | $2,518 |  |  |  | $1,955 |  |  |  | $560 |
(a) | Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased.
(b) | Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of March 31, 2014 regarding expected future usage, which is subject to change.
(c) | Includes individual commitments incurred during the normal course of business that exceeded $1 million at March 31, 2014.
MGP Site Estimated Future Costs And Recorded Liabilities | At March 31, 2014, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Range of estimated future costs |  | $14 |  | - | $33 |  |  | $13 |  | - | $31 |  |  | $1 |  | - | $2
Current and non-current environmental liabilities | 21 |  | 19 |  | 2
WPL [Member] |
Long-term Purchase Commitment [Line Items] |
Operating Expense Purchase Obligations | At March 31, 2014, minimum future commitments related to these operating expense purchase obligations were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Purchased power (a): |  |  |  |  |
DAEC (IPL) |  | $1,619 |  |  |  | $1,619 |  |  |  | $— |
Other | 247 |  |  | 1 |  |  | 246 |
| 1,866 |  |  | 1,620 |  |  | 246 |
Natural gas | 276 |  |  | 146 |  |  | 130 |
Coal (b) | 309 |  |  | 134 |  |  | 175 |
SO2 emission allowances | 34 |  |  | 34 |  |  | — |
Other (c) | 33 |  |  | 21 |  |  | 9 |
|  | $2,518 |  |  |  | $1,955 |  |  |  | $560 |
(a) | Includes payments required by PPAs for capacity rights and minimum quantities of MWhs required to be purchased.
(b) | Corporate Services entered into system-wide coal contracts on behalf of IPL and WPL that include minimum future commitments. These commitments were assigned to IPL and WPL based on information available as of March 31, 2014 regarding expected future usage, which is subject to change.
(c) | Includes individual commitments incurred during the normal course of business that exceeded $1 million at March 31, 2014.
MGP Site Estimated Future Costs And Recorded Liabilities | At March 31, 2014, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, were as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Range of estimated future costs |  | $14 |  | - | $33 |  |  | $13 |  | - | $31 |  |  | $1 |  | - | $2
Current and non-current environmental liabilities | 21 |  | 19 |  | 2

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- Definition Tabular disclosure of material liabilities for remediation, site restoration, postclosure, monitoring commitments, or other exit costs that may occur on the sale, disposal or abandonment of a property as a result of unanticipated contamination of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q4) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section Y -Paragraph Question 4 + Details
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