Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule of inventories

Inventories are valued at the lower of cost (first-in, first-out basis) or market. Cost includes material and conversion costs. Inventories consisted of the following:

as of December 31 (in millions)	2017		2016
Finished goods	$	610	$	223
Work-in-process	822		1,080
Raw materials	173		141
Inventories	$	1,605	$	1,444

Schedule of property and equipment

Property and Equipment

as of December 31 (in millions)	2017			2016
Land	$	48		$	46
Buildings	1,428			1,344
Equipment	5,991			5,726
Construction in progress	604			410
Property and equipment, gross	8,071			7,526
Less accumulated depreciation	(5,268		)	(4,922		)
Property and equipment, net	$	2,803		$	2,604