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Condensed Parent Company Financial Statements (Tables) | 12 Months Ended
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Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Condensed Statements of Income | 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.
Condensed Balance Sheets | 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.
Condensed Statements of Cash Flows | 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.

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