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Inventories, Net of Inventory Reserves
12 Months Ended
Dec. 31, 2019
Inventories, Net of Inventory Reserves [Abstract]  
Inventories, Net of Inventory Reserves 3.Inventories, Net of Inventory Reserves

Inventories, net of inventory reserves comprise the following (in millions):

December 31,

2019

2018

Finished goods

$

973

$

854

Work in process

421

386

Raw materials and accessories

481

409

Supplies and packing materials

445

388

Total inventories, net of inventory reserves

$

2,320

$

2,037