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INVENTORY, NET (Tables)
 12 Months Ended
Dec. 31, 2019
Inventories [Abstract]  
Disclosure of current inventories
(US$ MILLIONS)
 
2019
 
2018
Raw materials and consumables
 
$
941

 
$
605

Fuel products (1)
 
688

 
490

Work in progress
 
674

 
258

RTFO certificates (2)
 
342

 
95

Finished goods and other (3)
 
845

 
114

Carrying amount of inventories
 
$
3,490

 
$
1,562

____________________________________
(1) 
Fuel products are traded in active markets and are purchased with a view to resale in the near future. As a result, stocks of fuel products are recorded at fair value based on quoted market prices.
(2) 
$66 million of RTFO certificates are held for trading and recorded at fair value (2018: $nil). There is no externally quoted marketplace for the valuation of RTFO certificates. In order to value these contracts, the partnership has adopted a pricing methodology combining both observable inputs based on market data and assumptions developed internally based on observable market activity.
(3) 
Finished goods and other are mainly composed of finished goods inventory in the infrastructure services and industrials segments.
Disclosure of inventory obsolescence provision
The amount of inventory written down was as follows:
(US$ MILLIONS)
 
2019
 
2018
 
2017
Inventory obsolescence provision - beginning
 
$
19

 
$
4

 
$
9

Add: increase in provision
 
22

 
22

 
1

Deduct: inventory obsolescence write off
 
(8
)
 
(7
)
 
(6
)
Inventory obsolescence provision - ending
 
$
33

 
$
19

 
$
4