Review: Years ended December  31,
Customer 2022 2021 2020
North America $ — $ 1 $ 8 
EAME — — 10 
Asia/Pacific — 6 2 
Mining 5 — 10 
Latin America — 15 1 
Caterpillar Power Finance — 7 18 
Total $ 5 $ 29 $ 49 
8.     Inventories
 
Inventories (principally using the LIFO method) are comprised of the following:
 
 December  31,
(Millions of dollars) 2022 2021
Raw materials $ 6,370  $ 5,528  
Work-in-process 1,452  1,318  
Finished goods 8,138  6,907  
Supplies 310 285 
Total inventories $ 16,270  $ 14,038  
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9.     Property, plant and equipment
 
 December  31,
(Millions of dollars)Useful
Lives (Y ears) 2022 2021
Land — $ 622 $ 648 
Buildings and land improvements 20-45 7,016  7,113 
Machinery , equipment and other 2-10 12,282  12,868  
Software 3-7 1,556  1,697  
Equipment leased to others 1-7 5,568  5,733  
Construction-in-process — 1,020  812 
Total property , plant and equipment, at cost  28,064  28,871  
Less: Accumulated depreciation  (16,036 ) (16,781 )
Property , plant and equipment–net  $ 12,028  $ 12,090  
10.  Intangible assets and goodwill
A.Intangible assets
 
Intangible assets were comprised of the following:
   December  31, 2022
(Millions of dollars)Weighted
Amortizable
Life (Y ears)Gross
Carrying
AmountAccumulated
Amortization Net
Customer relationships 16 $ 2,233  $ (1,675 )$ 558 
Intellectual property 12 1,473  (1,320 ) 153