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Condensed Parent Company Financial Statements (Tables) | 12 Months Ended
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Dec. 31, 2020
Condensed Financial Information Disclosure [Abstract] |
Condensed Statements of Income |
ALLIANT ENERGY CORPORATION (Parent Company Only) | Year Ended December 31,
CONDENSED STATEMENTS OF INCOME | 2020 |  | 2019 |  | 2018
| (in millions)
Operating expenses | $7 |  |  | $2 |  |  | $5 |
Operating loss | (7) |  |  | (2) |  |  | (5) |
Other (income) and deductions: |  |  |  |  |
Equity earnings from consolidated subsidiaries | (625) |  |  | (562) |  |  | (523) |
Interest expense | 2 |  |  | 9 |  |  | 4 |
Other | 4 |  |  | 7 |  |  | 2 |
Total other (income) and deductions | (619) |  |  | (546) |  |  | (517) |
Income before income taxes | 612 |  |  | 544 |  |  | 512 |
Income tax benefit | (4) |  |  | (15) |  |  | (1) |
Net income | $616 |  |  | $559 |  |  | $513 |
Refer to accompanying Notes to Condensed Financial Statements.
Condensed Balance Sheets |
ALLIANT ENERGY CORPORATION (Parent Company Only) | December 31,
CONDENSED BALANCE SHEETS | 2020 |  | 2019
| (in millions)
ASSETS |  |  |
Current assets: |  |  |
Notes receivable from affiliated companies | $32 |  |  | $27 |
Other | 5 |  |  | 6 |
Total current assets | 37 |  |  | 33 |
Investments: |  |  |
Investments in consolidated subsidiaries | 6,664 |  |  | 6,017 |
Other | 2 |  |  | 1 |
Total investments | 6,666 |  |  | 6,018 |
Other assets | 88 |  |  | 89 |
Total assets | $6,791 |  |  | $6,140 |
LIABILITIES AND EQUITY |  |  |
Current liabilities: |  |  |
Commercial paper | $132 |  |  | $169 |
Notes payable to affiliated companies | 937 |  |  | 731 |
Other | 29 |  |  | 19 |
Total current liabilities | 1,098 |  |  | 919 |
Other liabilities | 2 |  |  | 15 |
Common equity: |  |  |
Common stock and additional paid-in capital | 2,706 |  |  | 2,448 |
Retained earnings | 2,996 |  |  | 2,766 |
Accumulated other comprehensive income | — |  |  | 2 |
Shares in deferred compensation trust | (11) |  |  | (10) |
Total common equity | 5,691 |  |  | 5,206 |
Total liabilities and equity | $6,791 |  |  | $6,140 |
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 | 2020 |  | 2019 |  | 2018
| (in millions)
Net cash flows from operating activities | $396 |  |  | $305 |  |  | $311 |
Cash flows used for investing activities: |  |  |  |  |
Capital contributions to consolidated subsidiaries | (429) |  |  | (250) |  |  | (625) |
Net change in notes receivable from and payable to affiliates | 201 |  |  | 8 |  |  | 441 |
Net cash flows used for investing activities | (228) |  |  | (242) |  |  | (184) |
Cash flows used for financing activities: |  |  |  |  |
Common stock dividends | (377) |  |  | (338) |  |  | (312) |
Proceeds from issuance of common stock, net | 247 |  |  | 390 |  |  | 197 |
Net change in commercial paper | (37) |  |  | (116) |  |  | (10) |
Other | (1) |  |  | 1 |  |  | (2) |
Net cash flows used for financing activities | (168) |  |  | (63) |  |  | (127) |
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 | ($2) |  |  | ($9) |  |  | ($4) |
Income taxes, net | 10 |  |  | 14 |  |  | 5 |
Refer to accompanying Notes to Condensed Financial Statements.

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