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Condensed Parent Company Financial Statements (Tables) | 12 Months Ended
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Dec. 31, 2018
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Condensed Statements of Income |
ALLIANT ENERGY CORPORATION (Parent Company Only) | Year Ended December 31,
CONDENSED STATEMENTS OF INCOME | 2018 |  | 2017 |  | 2016
| (in millions)
Revenues |  | $— |  |  |  | $— |  |  |  | $1 |
Operating expenses | 5 |  |  | 2 |  |  | 3 |
Operating loss | (5 | ) |  | (2 | ) |  | (2 | )
Other (income) and deductions: |  |  |  |  |
Equity earnings from consolidated subsidiaries | (523 | ) |  | (457 | ) |  | (374 | )
Interest expense | 4 |  |  | 3 |  |  | 3 |
Other | 2 |  |  | — |  |  | (2 | )
Total other (income) and deductions | (517 | ) |  | (454 | ) |  | (373 | )
Income before income taxes | 512 |  |  | 452 |  |  | 371 |
Income tax benefit | (1 | ) |  | (6 | ) |  | (1 | )
Net income |  | $513 |  |  |  | $458 |  |  |  | $372 |
Refer to accompanying Notes to Condensed Financial Statements.
Condensed Balance Sheets |
ALLIANT ENERGY CORPORATION (Parent Company Only) | December 31,
CONDENSED BALANCE SHEETS | 2018 |  | 2017
| (in millions)
ASSETS |  |  |
Current assets: |  |  |
Notes receivable from affiliated companies |  | $23 |  |  |  | $50 |
Other | 4 |  |  | 7 |
Total current assets | 27 |  |  | 57 |
Investments: |  |  |
Investments in consolidated subsidiaries | 5,518 |  |  | 4,676 |
Other | 1 |  |  | 2 |
Total investments | 5,519 |  |  | 4,678 |
Other assets | 81 |  |  | 78 |
Total assets |  | $5,627 |  |  |  | $4,813 |
LIABILITIES AND EQUITY |  |  |
Current liabilities: |  |  |
Commercial paper |  | $285 |  |  |  | $295 |
Notes payable to affiliated companies | 719 |  |  | 305 |
Other | 21 |  |  | 12 |
Total current liabilities | 1,025 |  |  | 612 |
Other liabilities | 17 |  |  | 20 |
Common equity: |  |  |
Common stock and additional paid-in capital | 2,048 |  |  | 1,848 |
Retained earnings | 2,545 |  |  | 2,344 |
Accumulated other comprehensive income | 2 |  |  | — |
Shares in deferred compensation trust | (10 | ) |  | (11 | )
Total common equity | 4,585 |  |  | 4,181 |
Total liabilities and equity |  | $5,627 |  |  |  | $4,813 |
Refer to accompanying Notes to Condensed Financial Statements.
Condensed Statements of Cash Flows |
ALLIANT ENERGY CORPORATION (Parent Company Only) | Year Ended December 31,
CONDENSED STATEMENTS OF CASH FLOWS | 2018 |  | 2017 |  | 2016
| (in millions)
Net cash flows from operating activities |  | $311 |  |  |  | $273 |  |  |  | $254 |
Cash flows from (used for) investing activities: |  |  |  |  |  |  |  |
Capital contributions to consolidated subsidiaries | (625 | ) |  | (290 | ) |  | (250 | )
Capital repayments from consolidated subsidiaries | — |  |  | — |  |  | 130 |
Net change in notes receivable from and payable to affiliates | 441 |  |  | 54 |  |  | 294 |
Other | — |  |  | — |  |  | 10 |
Net cash flows from (used for) investing activities | (184 | ) |  | (236 | ) |  | 184 |
Cash flows used for financing activities: |  |  |  |  |  |  |  |
Common stock dividends | (312 | ) |  | (288 | ) |  | (267 | )
Proceeds from issuance of common stock, net | 197 |  |  | 150 |  |  | 27 |
Payments to retire long-term debt | — |  |  | — |  |  | (250 | )
Net change in commercial paper | (10 | ) |  | 103 |  |  | 52 |
Other | (2 | ) |  | (2 | ) |  | — |
Net cash flows used for financing activities | (127 | ) |  | (37 | ) |  | (438 | )
Net increase (decrease) in cash, cash equivalents and restricted cash | — |  |  | — |  |  | — |
Cash, cash equivalents and restricted cash at beginning of period | — |  |  | — |  |  | — |
Cash, cash equivalents and restricted cash at end of period |  | $— |  |  |  | $— |  |  |  | $— |
Supplemental cash flows information: |  |  |  |  |  |  |  |
Cash (paid) refunded during the period for: |  |  |  |  |  |  |  |
Interest, net of capitalized interest |  | ($4 | ) |  |  | ($3 | ) |  |  | ($3 | )
Income taxes, net | 5 |  |  | — |  |  | (37 | )
Refer to accompanying Notes to Condensed Financial Statements.

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