| Long-lived assets | 2013 | 2012 | 2011 | ||||
| (millions of dollars) | |||||||
| United States | 98,271 | 94,336 | 91,146 | ||||
| Non-U.S. | 145,379 | 132,613 | 123,518 | ||||
| Total | 243,650 | 226,949 | 214,664 | ||||
| Significant non-U.S. long-lived assets include: | |||||||
| Canada | 41,522 | 31,979 | 24,458 | ||||
| Australia | 14,258 | 13,415 | 9,474 | ||||
| Nigeria | 12,343 | 12,216 | 11,806 | ||||
| Singapore | 9,570 | 9,700 | 9,285 | ||||
| Kazakhstan | 8,530 | 7,785 | 7,022 | ||||
| Angola | 8,262 | 8,238 | 10,395 | ||||
| Norway | 6,542 | 7,040 | 6,039 | ||||
| Papua New Guinea | 5,768 | 4,599 | 3,013 | ||||