Note 11. INVENTORIES Note 12. PROPERTY, PLANT AND EQUIPMENT AND LEASES Note 13. GOODWILL AND OTHER INTANGIBLE ASSETS Other assets include inventory expected to remain on hand beyond one year in both periods. Depreciation expense was $505 million in 2018, $682 million in 2017 and $448 million in 2016. Annual minimum rental commitments for non-cancelable operating leases (primarily real estate and motor vehicles) are approximately $100 million in each of the next five years and an aggregate $200 million thereafter. Operating lease expense was approximately $130 million in 2018, $120 million in 2017 and $140 million in 2016. Sublease income and capital lease obligations were not material for all periods presented. December 31, Dollars in Millions 2018 2017 Finished goods $ 396 $ 384 Work in process 1,026 931 Raw and packaging materials 202 273 Inventories $ 1,624 $ 1,588 Inventories $ 1,195 $ 1,166 Other assets 429 422 December 31, Dollars in Millions 2018 2017 Land $ 104 $ 100 Buildings 5,231 4,848 Machinery, equipment and fixtures 2,962 3,059 Construction in progress 548 980 Gross property, plant and equipment 8,845 8,987 Less accumulated depreciation (3,818) (3,986) Property, plant and equipment $ 5,027 $ 5,001 United States $ 3,772 $ 3,617 Europe 1,140 1,266 Rest of the World 115 118 Total $ 5,027 $ 5,001 December 31, Dollars in Millions Estimated Useful Lives 2018 2017 Goodwill $ 6,538 $ 6,863 Other intangible assets: Licenses 5 – 15 years $ 510 $ 567 Developed technology rights 9 – 15 years 2,357 2,357 Capitalized software 3 – 10 years 1,156 1,381 IPRD 32 32 Gross other intangible assets 4,055 4,337 Less accumulated amortization (2,964 ) (3,127 ) Total other intangible assets $ 1,091 $ 1,210 87