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v2.4.0.8

Investments (Summary Financial Information) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operating revenues | $ 634 | $ 611 | $ 575
Operating income | 334 | 326 | 307
Net income | 248 | 234 | 218
Current assets | 86 | 67 |
Non-current assets | 3,553 | 3,321 |
Current liabilities | 383 | 252 |
Non-current liabilities | 1,682 | 1,652 |
WPL [Member] |  |  |
Operating revenues | 634 | 611 | 575
Operating income | 334 | 325 | 308
Net income | 250 | 239 | 226
Current assets | 84 | 66 |
Non-current assets | 3,527 | 3,292 |
Current liabilities | 383 | 252 |
Non-current liabilities | $ 1,681 | $ 1,651 |

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