Pension Plans, Postretirement and Other Employee Benefits - Amounts to be Reflected as Component of Net Periodic Cost (Detail) $ in Millions	Dec. 31, 2018 USD ($)
Other Postretirement Benefits Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 4
Prior service cost	(8)
Total	(4)
U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	5
Prior service cost	0
Total	5
Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	5
Prior service cost	1
Total	$ 6