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Condensed Parent Company Financial Statements (Tables) | 12 Months Ended
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Dec. 31, 2015
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,
| 2015 |  | 2014 |  | 2013
| (in millions)
Operating revenues |  | $2 |  |  |  | $2 |  |  |  | $2 |
Operating expenses | 3 |  |  | 3 |  |  | 1 |
Operating income (loss) | (1 | ) |  | (1 | ) |  | 1 |
Interest expense and other: |  |  |  |  |
Equity earnings from consolidated subsidiaries | (379 | ) |  | (388 | ) |  | (361 | )
Interest expense | 3 |  |  | 9 |  |  | 11 |
Interest income | (3 | ) |  | (2 | ) |  | (2 | )
Total interest expense and other | (379 | ) |  | (381 | ) |  | (352 | )
Income before income taxes | 378 |  |  | 380 |  |  | 353 |
Income tax benefit | (1 | ) |  | (3 | ) |  | (5 | )
Net income |  | $379 |  |  |  | $383 |  |  |  | $358 |
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,
| 2015 |  | 2014
| (in millions)
ASSETS |  |  |
Current assets: |  |  |
Notes receivable from affiliated companies |  | $93 |  |  |  | $95 |
Other | 9 |  |  | 25 |
Total current assets | 102 |  |  | 120 |
Investments: |  |  |
Investments in consolidated subsidiaries | 3,999 |  |  | 3,721 |
Other | 14 |  |  | 15 |
Total investments | 4,013 |  |  | 3,736 |
Other assets | 20 |  |  | 10 |
Total assets |  | $4,135 |  |  |  | $3,866 |
LIABILITIES AND EQUITY |  |  |
Current liabilities: |  |  |
Current maturities of long-term debt |  | $250 |  |  |  | $— |
Commercial paper | 140 |  |  | 141 |
Other | 12 |  |  | 29 |
Total current liabilities | 402 |  |  | 170 |
Long-term debt, net (excluding current portion) | — |  |  | 250 |
Other liabilities | 12 |  |  | 11 |
Common equity: |  |  |
Common stock and additional paid-in capital | 1,664 |  |  | 1,510 |
Retained earnings | 2,066 |  |  | 1,934 |
Shares in deferred compensation trust | (9 | ) |  | (9 | )
Total common equity | 3,721 |  |  | 3,435 |
Total liabilities and equity |  | $4,135 |  |  |  | $3,866 |
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,
| 2015 |  | 2014 |  | 2013
| (in millions)
Net cash flows from operating activities |  | $262 |  |  |  | $246 |  |  |  | $238 |
Cash flows used for investing activities: |  |  |  |  |  |  |  |
Capital contributions to consolidated subsidiaries | (165 | ) |  | (90 | ) |  | (120 | )
Capital repayments from consolidated subsidiaries | — |  |  | 50 |  |  | 95 |
Net change in notes receivable from affiliates | 2 |  |  | (23 | ) |  | 5 |
Other | — |  |  | — |  |  | (2 | )
Net cash flows used for investing activities | (163 | ) |  | (63 | ) |  | (22 | )
Cash flows used for financing activities: |  |  |  |  |  |  |  |
Common stock dividends | (247 | ) |  | (226 | ) |  | (208 | )
Proceeds from issuance of common stock, net | 151 |  |  | — |  |  | — |
Proceeds from issuance of long-term debt | — |  |  | 250 |  |  | — |
Payments to retire long-term debt | — |  |  | (250 | ) |  | — |
Net change in commercial paper | (1 | ) |  | 45 |  |  | (9 | )
Other | (2 | ) |  | (2 | ) |  | 1 |
Net cash flows used for financing activities | (99 | ) |  | (183 | ) |  | (216 | )
Net 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 | ) |  |  | ($11 | ) |  |  | ($13 | )
Income taxes, net | (9 | ) |  | (5 | ) |  | (7 | )
The accompanying Notes to Condensed Financial Statements are an integral part of these statements.

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