Income Taxes (Unrecognized Tax Benefits) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Undistributed Earnings of Foreign Subsidiaries	$ 5,300	$ 5,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	82	71	$ 85
Current year tax positions - additions	25	14	12
Prior year tax positions - additions	8	5	3
Pre-acquisition unrecognized tax benefits	0	4	0
Prior year tax positions - reductions	(11)	(3)	(15)
Statute of limitations expirations	(8)	(1)	(2)
Settlements	0	(3)	(6)
Foreign currency translation	(2)	(5)	(6)
Ending balance	$ 94	$ 82	$ 71