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Condensed Parent Company Financial Statements | 12 Months Ended
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Dec. 31, 2012
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Condensed Parent Company Financial Statements | SCHEDULE I - CONDENSED PARENT COMPANY FINANCIAL STATEMENTS ALLIANT ENERGY CORPORATION (Parent Company Only) CONDENSED STATEMENTS OF INCOME
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
| (in millions)
Operating revenues |  | $2 |  |  |  | $4 |  |  |  | $1 |
Operating expenses | 1 |  |  | 1 |  |  | 2 |
Operating income (loss) | 1 |  |  | 3 |  |  | (1 | )
Interest expense and other: |  |  |  |  |
Equity earnings from consolidated subsidiaries | (322 | ) |  | (304 | ) |  | (292 | )
Interest expense | 11 |  |  | 11 |  |  | 11 |
Interest income | (4 | ) |  | (2 | ) |  | (1 | )
Total interest expense and other | (315 | ) |  | (295 | ) |  | (282 | )
Income before income taxes | 316 |  |  | 298 |  |  | 281 |
Income tax benefit | (4 | ) |  | (5 | ) |  | (6 | )
Net income |  | $320 |  |  |  | $303 |  |  |  | $287 |
The accompanying Notes to Condensed Financial Statements are an integral part of these statements. ALLIANT ENERGY CORPORATION (Parent Company Only) CONDENSED BALANCE SHEETS
| December 31,
| 2012 |  | 2011
| (in millions)
ASSETS |  |  |
Current assets: |  |  |
Notes receivable from affiliated companies |  | $77 |  |  |  | $211 |
Income tax refunds receivable | — |  |  | 11 |
Other | 2 |  |  | 5 |
| 79 |  |  | 227 |
Investments: |  |  |
Investments in consolidated subsidiaries | 3,447 |  |  | 3,129 |
Other | 20 |  |  | 20 |
| 3,467 |  |  | 3,149 |
Other assets | 5 |  |  | 6 |
Total assets |  | $3,551 |  |  |  | $3,382 |
The accompanying Notes to Condensed Financial Statements are an integral part of these statements. ALLIANT ENERGY CORPORATION (Parent Company Only) CONDENSED BALANCE SHEETS (continued)
| December 31,
| 2012 |  | 2011
| (in millions)
CAPITALIZATION AND LIABILITIES |  |  |
Capitalization: |  |  |
Common stock and additional paid-in capital |  | $1,512 |  |  |  | $1,512 |
Retained earnings | 1,627 |  |  | 1,506 |
Accumulated other comprehensive loss | (1 | ) |  | (1 | )
Shares in deferred compensation trust | (7 | ) |  | (8 | )
Total common equity | 3,131 |  |  | 3,009 |
Long-term debt, net | 250 |  |  | 250 |
| 3,381 |  |  | 3,259 |
Current liabilities: |  |  |
Commercial paper | 105 |  |  | 70 |
Other | 21 |  |  | 14 |
| 126 |  |  | 84 |
Other long-term liabilities and deferred credits: |  |  |
Deferred income taxes | 38 |  |  | 32 |
Other | 6 |  |  | 7 |
| 44 |  |  | 39 |
Total capitalization and liabilities |  | $3,551 |  |  |  | $3,382 |
The accompanying Notes to Condensed Financial Statements are an integral part of these statements. ALLIANT ENERGY CORPORATION (Parent Company Only) CONDENSED STATEMENTS OF CASH FLOWS
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
| (in millions)
Net cash flows from operating activities |  | $260 |  |  |  | $193 |  |  |  | $110 |
Cash flows from (used for) investing activities: |  |  |  |  |  |  |  |
Capital contributions to consolidated subsidiaries | (230 | ) |  | (144 | ) |  | (125 | )
Capital repayments from consolidated subsidiaries | — |  |  | 101 |  |  | 183 |
Net change in notes receivable from affiliates | 134 |  |  | — |  |  | — |
Other | 1 |  |  | — |  |  | — |
Net cash flows from (used for) investing activities | (95 | ) |  | (43 | ) |  | 58 |
Cash flows used for financing activities: |  |  |  |  |  |  |  |
Common stock dividends | (199 | ) |  | (188 | ) |  | (175 | )
Net change in borrowings with affiliates | — |  |  | (155 | ) |  | 50 |
Net change in commercial paper | 35 |  |  | 70 |  |  | — |
Proceeds from issuance of common stock | 1 |  |  | 2 |  |  | 6 |
Other | (2 | ) |  | (2 | ) |  | (1 | )
Net cash flows used for financing activities | (165 | ) |  | (273 | ) |  | (120 | )
Net increase (decrease) in cash and cash equivalents | — |  |  | (123 | ) |  | 48 |
Cash and cash equivalents at beginning of period | — |  |  | 123 |  |  | 75 |
Cash and cash equivalents at end of period |  | $— |  |  |  | $— |  |  |  | $123 |
Supplemental cash flows information: |  |  |  |  |  |  |  |
Cash paid (refunded) during the period for: |  |  |  |  |  |  |  |
Interest, net of capitalized interest |  | $11 |  |  |  | $11 |  |  |  | $11 |
Income taxes, net of refunds | (29 | ) |  | (6 | ) |  | (11 | )
The accompanying Notes to Condensed Financial Statements are an integral part of these statements. ALLIANT ENERGY CORPORATION (Parent Company Only) NOTES TO CONDENSED FINANCIAL STATEMENTS Pursuant to rules and regulations of the Securities and Exchange Commission, the Condensed Financial Statements of Alliant Energy Corporation (Parent Company Only) do not reflect all of the information and notes normally included with financial statements prepared in accordance with accounting principles generally accepted in the United States of America. Therefore, these Condensed Financial Statements should be read in conjunction with the Consolidated Financial Statements and related Combined Notes to Consolidated Financial Statements included in Alliant Energy’s 2012 Form 10-K, Part II, Item 8, which is incorporated herein by reference. In the Condensed Financial Statements of Alliant Energy Corporation (Parent Company Only), investments in subsidiaries are accounted for using the equity method.

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- Definition The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 06 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 05 -Paragraph c -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7656940&loc=d3e5283-111683 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24072-122690 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 24 -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. + Details
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