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Investment and other income | 12 Months Ended
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Dec. 31, 2013
Investment and other income | 8. Investment and other income Investment and other income includes gains and losses on asset sales as follows:
millions of dollars |  | 2013 |  |  | 2012 |  |  | 2011 |
Proceeds from asset sales |  |  | 160 |  |  |  | 226 |  |  |  | 314 |
Book value of assets sold |  |  | 10 |  |  |  | 132 |  |  |  | 117 |
Gain/(loss) on asset sales, before tax (a) |  |  | 150 |  |  |  | 94 |  |  |  | 197 |
Gain/(loss) on asset sales, after tax (a) |  |  | 120 |  |  |  | 72 |  |  |  | 153 |
(a) | 2013 included a gain of $85 million ($73 million after tax) for the sale of non-operating assets.

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- Definition The entire disclosure for interest and other income. + References No definition available. + Details
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