Supplemental Cash Flow Information - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Net cash paid for taxes	$ 203	$ 153	$ 645
Cash paid for interest	$ 381	$ 424	$ 437