December 31, 2013 | ||||||||||||||
(Millions of dollars) | Weighted Amortizable Life (Years) | Gross Carrying Amount | Accumulated Amortization | Net | ||||||||||
Customer relationships | 15 | $ | 2,653 | $ | (539 | ) | $ | 2,114 | ||||||
Intellectual property | 11 | 1,821 | (495 | ) | 1,326 | |||||||||
Other | 10 | 274 | (136 | ) | 138 | |||||||||
Total finite-lived intangible assets | 13 | 4,748 | (1,170 | ) | 3,578 | |||||||||
Indefinite-lived intangible assets - In-process research & development | 18 | — | 18 | |||||||||||
Total intangible assets | $ | 4,766 | $ | (1,170 | ) | $ | 3,596 | |||||||
December 31, 2012 | ||||||||||||||
Weighted Amortizable Life (Years) | Gross Carrying Amount | Accumulated Amortization | Net | |||||||||||
Customer relationships | 15 | $ | 2,756 | $ | (377 | ) | $ | 2,379 | ||||||
Intellectual property | 12 | 1,767 | (342 | ) | 1,425 | |||||||||
Other | 10 | 299 | (105 | ) | 194 | |||||||||
Total finite-lived intangible assets | 13 | 4,822 | (824 | ) | 3,998 | |||||||||
Indefinite-lived intangible assets - In-process research & development | 18 | — | 18 | |||||||||||
Total intangible assets | $ | 4,840 | $ | (824 | ) | $ | 4,016 | |||||||
December 31, 2011 | ||||||||||||||
Weighted Amortizable Life (Years) | Gross Carrying Amount | Accumulated Amortization | Net | |||||||||||
Customer relationships | 15 | $ | 2,811 | $ | (213 | ) | $ | 2,598 | ||||||
Intellectual property | 11 | 1,794 | (244 | ) | 1,550 | |||||||||
Other | 11 | 299 | (97 | ) | 202 | |||||||||
Total finite-lived intangible assets | 13 | 4,904 | (554 | ) | 4,350 | |||||||||
Indefinite-lived intangible assets - In-process research & development | 18 | — | 18 | |||||||||||
Total intangible assets | $ | 4,922 | $ | (554 | ) | $ | 4,368 | |||||||