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Condensed Parent Company Financial Statements | 12 Months Ended
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Dec. 31, 2015
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,
| 2015 |  | 2014 |  | 2013
| (in millions)
Operating revenues |  | $2 |  |  |  | $2 |  |  |  | $2 |
Operating expenses | 3 |  |  | 3 |  |  | 1 |
Operating income (loss) | (1 | ) |  | (1 | ) |  | 1 |
Interest expense and other: |  |  |  |  |
Equity earnings from consolidated subsidiaries | (379 | ) |  | (388 | ) |  | (361 | )
Interest expense | 3 |  |  | 9 |  |  | 11 |
Interest income | (3 | ) |  | (2 | ) |  | (2 | )
Total interest expense and other | (379 | ) |  | (381 | ) |  | (352 | )
Income before income taxes | 378 |  |  | 380 |  |  | 353 |
Income tax benefit | (1 | ) |  | (3 | ) |  | (5 | )
Net income |  | $379 |  |  |  | $383 |  |  |  | $358 |
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,
| 2015 |  | 2014
| (in millions)
ASSETS |  |  |
Current assets: |  |  |
Notes receivable from affiliated companies |  | $93 |  |  |  | $95 |
Other | 9 |  |  | 25 |
Total current assets | 102 |  |  | 120 |
Investments: |  |  |
Investments in consolidated subsidiaries | 3,999 |  |  | 3,721 |
Other | 14 |  |  | 15 |
Total investments | 4,013 |  |  | 3,736 |
Other assets | 20 |  |  | 10 |
Total assets |  | $4,135 |  |  |  | $3,866 |
LIABILITIES AND EQUITY |  |  |
Current liabilities: |  |  |
Current maturities of long-term debt |  | $250 |  |  |  | $— |
Commercial paper | 140 |  |  | 141 |
Other | 12 |  |  | 29 |
Total current liabilities | 402 |  |  | 170 |
Long-term debt, net (excluding current portion) | — |  |  | 250 |
Other liabilities | 12 |  |  | 11 |
Common equity: |  |  |
Common stock and additional paid-in capital | 1,664 |  |  | 1,510 |
Retained earnings | 2,066 |  |  | 1,934 |
Shares in deferred compensation trust | (9 | ) |  | (9 | )
Total common equity | 3,721 |  |  | 3,435 |
Total liabilities and equity |  | $4,135 |  |  |  | $3,866 |
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,
| 2015 |  | 2014 |  | 2013
| (in millions)
Net cash flows from operating activities |  | $262 |  |  |  | $246 |  |  |  | $238 |
Cash flows used for investing activities: |  |  |  |  |  |  |  |
Capital contributions to consolidated subsidiaries | (165 | ) |  | (90 | ) |  | (120 | )
Capital repayments from consolidated subsidiaries | — |  |  | 50 |  |  | 95 |
Net change in notes receivable from affiliates | 2 |  |  | (23 | ) |  | 5 |
Other | — |  |  | — |  |  | (2 | )
Net cash flows used for investing activities | (163 | ) |  | (63 | ) |  | (22 | )
Cash flows used for financing activities: |  |  |  |  |  |  |  |
Common stock dividends | (247 | ) |  | (226 | ) |  | (208 | )
Proceeds from issuance of common stock, net | 151 |  |  | — |  |  | — |
Proceeds from issuance of long-term debt | — |  |  | 250 |  |  | — |
Payments to retire long-term debt | — |  |  | (250 | ) |  | — |
Net change in commercial paper | (1 | ) |  | 45 |  |  | (9 | )
Other | (2 | ) |  | (2 | ) |  | 1 |
Net cash flows used for financing activities | (99 | ) |  | (183 | ) |  | (216 | )
Net decrease in cash and cash equivalents | — |  |  | — |  |  | — |
Cash and cash equivalents at beginning of period | — |  |  | — |  |  | — |
Cash and cash equivalents at end of period |  | $— |  |  |  | $— |  |  |  | $— |
Supplemental cash flows information: |  |  |  |  |  |  |  |
Cash paid during the period for: |  |  |  |  |  |  |  |
Interest, net of capitalized interest |  | ($3 | ) |  |  | ($11 | ) |  |  | ($13 | )
Income taxes, net | (9 | ) |  | (5 | ) |  | (7 | )
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 SEC, 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 GAAP. Therefore, these Condensed Financial Statements should be read in conjunction with the Financial Statements and related Notes included in Alliant Energy’s 2015 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. Alliant Energy allocates income tax expense to its subsidiaries that are members of the group that file a consolidated or combined income tax return. In the fourth quarter of 2015, Alliant Energy changed its method of allocating income tax provisions and related deferred tax assets and liabilities to its subsidiaries from the parent-company-down approach to the modified separate return approach. The change was retrospectively applied to the Parent Company’s Condensed Financial Statements. This tax method change did not impact Alliant Energy’s consolidated financial statements. The change had no impact on Parent Company net income, but impacted the income tax provisions and the equity earnings from consolidated subsidiaries in the Parent Company Condensed Statements of Income, as well as investment in consolidated subsidiaries and deferred tax liabilities on the Parent Company Condensed Balance Sheets. Refer to Note 1(c) for additional information on the tax method change.

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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 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 2: 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=26873400&loc=d3e24072-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 06 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 12 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 05 -Paragraph c -Article 7 + Details
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