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Supplemental Balance Sheet Data - Inventory (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Raw materials $ 359 $ 397
Work in process 203 203
Finished goods 1,131 1,214
Supplies and other 281 278
Inventory, Gross 1,974 2,092
Excess of FIFO or weighted-average cost over LIFO cost (167) (183)
Total 1,807 1,909
LIFO    
Raw materials 94 100
Work in process 106 110
Finished goods 472 525
Supplies and other 0 0
Inventory, Gross 672 735
Excess of FIFO or weighted-average cost over LIFO cost (167) (183)
Total 505 552
Non-LIFO    
Raw materials 265 297
Work in process 97 93
Finished goods 659 689
Supplies and other 281 278
Inventory, Gross 1,302 1,357
Excess of FIFO or weighted-average cost over LIFO cost 0 0
Total $ 1,302 $ 1,357