Business Restructuring (Additional Information) (Detail) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Business restructuring			$ 83	$ 176	$ 66	$ 0
Restructuring reserve, release of previously approved programs				(18)	(49)
Payments for restructuring				58	66	49
Restructuring reserve, foreign currency translation gain (loss)				(4)	4
Restructuring, other adjustment					12
Total reserve balance				224	110	$ 102
2019 Restructuring Program [Member]
Restructuring Cost and Reserve [Line Items]
Business restructuring	$ 10	$ 184
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Business restructuring			$ 80
Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Business restructuring				194	83
Restructuring reserve, approval of new programs					32
Restructuring reserve, release of previously approved programs				$ (18)	$ (49)