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Condensed Parent Company Financial Statements (Tables) | 12 Months Ended
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Dec. 31, 2022
Condensed Financial Information Disclosure [Abstract] |
Condensed Statements of Income |
ALLIANT ENERGY CORPORATION (Parent Company Only) | Year Ended December 31,
CONDENSED STATEMENTS OF INCOME | 2022 |  | 2021 |  | 2020
| (in millions)
Operating expenses | $9 |  |  | $5 |  |  | $7 |
Operating loss | (9) |  |  | (5) |  |  | (7) |
Other (income) and deductions: |  |  |  |  |
Equity earnings from consolidated subsidiaries | (707) |  |  | (664) |  |  | (625) |
Interest expense | 6 |  |  | 1 |  |  | 2 |
Other | 1 |  |  | 1 |  |  | 4 |
Total other (income) and deductions | (700) |  |  | (662) |  |  | (619) |
Income before income taxes | 691 |  |  | 657 |  |  | 612 |
Income tax expense (benefit) | 2 |  |  | (5) |  |  | (4) |
Net income | $689 |  |  | $662 |  |  | $616 |
Refer to accompanying Notes to Condensed Financial Statements.
Condensed Balance Sheets |
ALLIANT ENERGY CORPORATION (Parent Company Only) | December 31,
CONDENSED BALANCE SHEETS | 2022 |  | 2021
| (in millions)
ASSETS |  |  |
Current assets: |  |  |
Notes receivable from affiliated companies | $65 |  |  | $16 |
Other | 1 |  |  | 5 |
Total current assets | 66 |  |  | 21 |
Investments: |  |  |
Investments in consolidated subsidiaries | 7,801 |  |  | 7,061 |
Other | 2 |  |  | 2 |
Total investments | 7,803 |  |  | 7,063 |
Other assets | 97 |  |  | 96 |
Total assets | $7,966 |  |  | $7,180 |
LIABILITIES AND EQUITY |  |  |
Current liabilities: |  |  |
Commercial paper | $352 |  |  | $279 |
Notes payable to affiliated companies | 1,318 |  |  | 900 |
Other | 10 |  |  | 4 |
Total current liabilities | 1,680 |  |  | 1,183 |
Other liabilities | 1 |  |  | 2 |
Common equity: |  |  |
Common stock and additional paid-in capital | 2,780 |  |  | 2,752 |
Retained earnings | 3,518 |  |  | 3,255 |
Shares in deferred compensation trust | (13) |  |  | (12) |
Total common equity | 6,285 |  |  | 5,995 |
Total liabilities and equity | $7,966 |  |  | $7,180 |
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 | 2022 |  | 2021 |  | 2020
| (in millions)
Net cash flows from operating activities | $492 |  |  | $494 |  |  | $396 |
Cash flows used for investing activities: |  |  |  |  |
Capital contributions to consolidated subsidiaries | (530) |  |  | (295) |  |  | (429) |
Net change in notes receivable from and payable to affiliates | 369 |  |  | (21) |  |  | 201 |
Dividends from consolidated subsidiaries in excess of equity earnings | — |  |  | 50 |  |  | — |
Net cash flows used for investing activities | (161) |  |  | (266) |  |  | (228) |
Cash flows used for financing activities: |  |  |  |  |
Common stock dividends | (428) |  |  | (403) |  |  | (377) |
Proceeds from issuance of common stock, net | 25 |  |  | 28 |  |  | 247 |
Net change in commercial paper | 73 |  |  | 147 |  |  | (37) |
Other | (1) |  |  | — |  |  | (1) |
Net cash flows used for financing activities | (331) |  |  | (228) |  |  | (168) |
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 | ($6) |  |  | ($1) |  |  | ($2) |
Income taxes, net | $15 |  |  | $4 |  |  | $10 |
Refer to accompanying Notes to Condensed Financial Statements.

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