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Investment and other income (Tables) | 12 Months Ended
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Dec. 31, 2014
Gains and Losses on Asset Sales | Investment and other income includes gains and losses on asset sales as follows:
millions of dollars |  | 2014 |  |  | 2013 |  |  | 2012 |
Proceeds from asset sales |  |  | 851 |  |  |  | 160 |  |  |  | 226 |
Book value of assets sold |  |  | 155 |  |  |  | 10 |  |  |  | 132 |
Gain/(loss) on asset sales, before tax (a)(b) |  |  | 696 |  |  |  | 150 |  |  |  | 94 |
Gain/(loss) on asset sales, after tax (a)(b) |  |  | 526 |  |  |  | 120 |  |  |  | 72 |
| (a) | 2014 included a gain of $638 million ($478 million, after tax) for the sale of the company’s interest in producing conventional assets located in Boundary Lake, Cynthia/West Pembina and Rocky Mountain House.
| (b) | 2013 included a gain of $85 million ($73 million, after tax) for the sale of non-operating assets.

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- Definition Tabular disclosure of interest income and other income elements which are not separately disclosed on the income statement. + References No definition available. + Details
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