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Supplemental Balance Sheet Data - Inventory (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Raw materials $ 337 $ 362
Work in process 230 214
Finished goods 1,203 1,153
Supplies and other 267 275
Inventory, Gross 2,037 2,004
Excess of FIFO or weighted-average cost over LIFO cost (181) (191)
Total 1,856 1,813
LIFO    
Raw materials 88 99
Work in process 134 120
Finished goods 485 461
Supplies and other 0 0
Inventory, Gross 707 680
Excess of FIFO or weighted-average cost over LIFO cost (181) (191)
Total 526 489
Non-LIFO    
Raw materials 249 263
Work in process 96 94
Finished goods 718 692
Supplies and other 267 275
Inventory, Gross 1,330 1,324
Excess of FIFO or weighted-average cost over LIFO cost 0 0
Total $ 1,330 $ 1,324