2013 | 2012 | ||||||||||||||
Gross Carrying Amount | Accumulated Amortization | Gross Carrying Amount | Accumulated Amortization | ||||||||||||
Distribution rights | $2,275 | $483 | $2,132 | $388 | |||||||||||
Product know-how | 507 | 199 | 507 | 171 | |||||||||||
Customer base | 615 | 347 | 617 | 300 | |||||||||||
Developed technology | 853 | 742 | 865 | 717 | |||||||||||
Other | 233 | 157 | 214 | 145 | |||||||||||
Total | $4,483 | $1,928 | $4,335 | $1,721 |
Commercial Airplanes | Boeing Military Aircraft | Network & Space Systems | Global Services & Support | Total | |||||||||||||||
Balance at January 1, 2011 | $2,110 | $1,041 | $1,461 | $325 | $4,937 | ||||||||||||||
Acquisitions | 16 | 16 | |||||||||||||||||
Goodwill adjustments | (4 | ) | (4 | ) | (8 | ) | |||||||||||||
Balance at December 31, 2011 | $2,106 | $1,041 | $1,473 | $325 | $4,945 | ||||||||||||||
Acquisitions | 12 | 72 | 84 | ||||||||||||||||
Goodwill adjustments | 7 | (1 | ) | 6 | |||||||||||||||
Balance at December 31, 2012 | $2,125 | $1,041 | $1,472 | $397 | $5,035 | ||||||||||||||
Acquisitions | 18 | 7 | 25 | ||||||||||||||||
Goodwill adjustments (1) | (17 | ) | (45 | ) | 41 | 4 | (17 | ) | |||||||||||
Balance at December 31, 2013 | $2,108 | $1,014 | $1,513 | $408 | $5,043 |
2014 | 2015 | 2016 | 2017 | 2018 | |||||||||||||||
Estimated amortization expense | $219 | $214 | $199 | $193 | $186 |