Supplemental Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Net cash provided by operating activities included:
Interest paid (net of amounts capitalized)	$ 400	$ 262
Net income taxes paid to taxing authorities	28	1,286
Non-cash investing and financing activities:
Property, plant and equipment sold	0	5
Property, plant and equipment acquired	$ 0	$ 5