Property Plant And Equipment (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 316	$ 280	$ 285
Rental expense under operating leases	$ 84	$ 84	$ 70