| 2013 | ||||||||||||
| Pension | Other | |||||||||||
| U.S. | Non-U.S. | Postretirement | ||||||||||
| Private | Private | Real | Private | |||||||||
| Equity | Equity | Estate | Equity | |||||||||
| (millions of dollars) | ||||||||||||
| Fair value at January 1 | 489 | 448 | 293 | 7 | ||||||||
| Net realized gains/(losses) | (1) | 11 | (13) | - | ||||||||
| Net unrealized gains/(losses) | 86 | 57 | 10 | 3 | ||||||||
| Net purchases/(sales) | (51) | (14) | (154) | (1) | ||||||||
| Fair value at December 31 | 523 | 502 | 136 | 9 | ||||||||
| 2012 | ||||||||||||
| Pension | Other | |||||||||||
| U.S. | Non-U.S. | Postretirement | ||||||||||
| Private | Private | Real | Private | |||||||||
| Equity | Equity | Estate | Equity | |||||||||
| (millions of dollars) | ||||||||||||
| Fair value at January 1 | 458 | 393 | 397 | 7 | ||||||||
| Net realized gains/(losses) | 2 | 2 | (14) | - | ||||||||
| Net unrealized gains/(losses) | 41 | 22 | (1) | - | ||||||||
| Net purchases/(sales) | (12) | 31 | (89) | - | ||||||||
| Fair value at December 31 | 489 | 448 | 293 | 7 | ||||||||