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Inventories (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Inventory Disclosure [Abstract]          
Inventories valued on the last-in, first out (LIFO) basis $ 3,600   $ 3,600   $ 3,085
Estimated excess of current replacement cost over LIFO cost of inventories 3,000   3,000   $ 1,300
Decreased net income due to LIFO inventory liquidations $ 15 $ 1 $ 58 $ 37