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Condensed Parent Company Financial Statements | 12 Months Ended
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Dec. 31, 2017
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,
| 2017 |  | 2016 |  | 2015
| (in millions)
Operating revenues |  | $— |  |  |  | $1 |  |  |  | $2 |
Operating expenses | 2 |  |  | 3 |  |  | 3 |
Operating loss | (2 | ) |  | (2 | ) |  | (1 | )
Interest expense and other: |  |  |  |  |
Equity earnings from consolidated subsidiaries | (457 | ) |  | (374 | ) |  | (379 | )
Interest expense | 3 |  |  | 3 |  |  | 3 |
Interest income | — |  |  | (2 | ) |  | (3 | )
Total interest expense and other | (454 | ) |  | (373 | ) |  | (379 | )
Income before income taxes | 452 |  |  | 371 |  |  | 378 |
Income tax benefit | (6 | ) |  | (1 | ) |  | (1 | )
Net income |  | $458 |  |  |  | $372 |  |  |  | $379 |
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,
| 2017 |  | 2016
| (in millions)
ASSETS |  |  |
Current assets: |  |  |
Notes receivable from affiliated companies |  | $50 |  |  |  | $74 |
Other | 7 |  |  | 5 |
Total current assets | 57 |  |  | 79 |
Investments: |  |  |
Investments in consolidated subsidiaries | 4,676 |  |  | 4,211 |
Other | 2 |  |  | 2 |
Total investments | 4,678 |  |  | 4,213 |
Other assets | 78 |  |  | 64 |
Total assets |  | $4,813 |  |  |  | $4,356 |
LIABILITIES AND EQUITY |  |  |
Current liabilities: |  |  |
Commercial paper |  | $295 |  |  |  | $192 |
Notes payable to affiliated companies | 305 |  |  | 275 |
Other | 12 |  |  | 12 |
Total current liabilities | 612 |  |  | 479 |
Other liabilities | 20 |  |  | 18 |
Common equity: |  |  |
Common stock and additional paid-in capital | 1,848 |  |  | 1,695 |
Retained earnings | 2,344 |  |  | 2,174 |
Shares in deferred compensation trust | (11 | ) |  | (10 | )
Total common equity | 4,181 |  |  | 3,859 |
Total liabilities and equity |  | $4,813 |  |  |  | $4,356 |
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,
| 2017 |  | 2016 |  | 2015
| (in millions)
Net cash flows from operating activities |  | $273 |  |  |  | $254 |  |  |  | $262 |
Cash flows from (used for) investing activities: |  |  |  |  |  |  |  |
Capital contributions to consolidated subsidiaries | (290 | ) |  | (250 | ) |  | (165 | )
Capital repayments from consolidated subsidiaries | — |  |  | 130 |  |  | — |
Net change in notes receivable from and payable to affiliates | 54 |  |  | 294 |  |  | 2 |
Other | — |  |  | 10 |  |  | — |
Net cash flows from (used for) investing activities | (236 | ) |  | 184 |  |  | (163 | )
Cash flows used for financing activities: |  |  |  |  |  |  |  |
Common stock dividends | (288 | ) |  | (267 | ) |  | (247 | )
Proceeds from issuance of common stock, net | 150 |  |  | 27 |  |  | 151 |
Payments to retire long-term debt | — |  |  | (250 | ) |  | — |
Net change in commercial paper | 103 |  |  | 52 |  |  | (1 | )
Other | (2 | ) |  | — |  |  | (2 | )
Net cash flows used for financing activities | (37 | ) |  | (438 | ) |  | (99 | )
Net increase (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 | ) |  |  | ($3 | ) |  |  | ($3 | )
Income taxes, net | — |  |  | (37 | ) |  | (9 | )
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 the combined 2017 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 FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.7-05(c)(Schedule II)) -URI http://asc.fasb.org/extlink&oid=6879921&loc=d3e569147-122900 Reference 2: 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=68079674&loc=d3e5283-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.9-06) -URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537971-122884 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04(c)(Schedule I)) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 5: 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 + Details
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