Pension Plans, Postretirement and Other Employee Benefits - Amounts to be Reflected as Component of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Pension Plans | U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss	$ 255	$ 130
Prior service cost	0	0
Total	255	130
Pension Plans | Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss	80	91
Prior service cost	4	3
Total	84	94
Other Postretirement Benefits Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss	31	51
Prior service cost	(73)	0
Total	$ (42)	$ 51