XML 60 R49.htm IDEA: XBRL DOCUMENT v3.19.2
Inventories Textual (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Inventories [Abstract]    
LIFO Inventory Amount $ 255 $ 292
Excess of Replacement or Current Costs over Stated LIFO Value $ 156 $ 75