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v3.3.1.900

Investments (Summary Financial Information) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Operating revenues | $ 624 | $ 643 | $ 634
Operating income | 299 | 330 | 334
Net income | 186 | 240 | 248
Current assets | 88 | 72 |
Non-current assets | 3,987 | 3,773 |
Current liabilities | 332 | 315 |
Non-current liabilities | 2,052 | 1,871 |
WPL [Member] |  |  |
Operating revenues | 624 | 643 | 634
Operating income | 299 | 330 | 334
Net income | 202 | 240 | $ 250
Current assets | 87 | 70 |
Non-current assets | 3,977 | 3,747 |
Current liabilities | 332 | 315 |
Non-current liabilities | $ 2,052 | $ 1,870 |

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