Income Taxes (Unrecognized Tax Benefits) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Undistributed Earnings of Foreign Subsidiaries	$ 3,600	$ 3,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	166	148	$ 94
Current year tax positions - additions	25	36	37
Prior year tax positions - additions	4	17	26
Prior year tax positions - reductions	(9)	(6)	0
Statute of limitations expirations	(6)	(9)	(8)
Settlements	(12)	(15)	(10)
Foreign currency translation	(1)	(5)	9
Ending balance	$ 167	$ 166	$ 148