Inventories (Detail) - USD ($) $ in Millions		Sep. 30, 2018		Jan. 01, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Finished goods		$ 2,581			$ 2,883
Work-in-process		4,764			3,908
Raw materials and supplies		839			788
Inventories		8,184	[1],[2]	$ 7,567	7,578	[1],[2]
Noncurrent inventories not included above	[3]	$ 576			$ 683

[1] Amounts may not add due to rounding.

[2] The change from December 31, 2017 reflects increases for certain products to meet targeted levels in the normal course of business, including inventory build for supply recovery, network strategy and new product launches, partially offset by a decrease due to foreign exchange.

[3] Included in Other noncurrent assets. There are no recoverability issues associated with these amounts.