Pension and Postretirement Benefits - Summary of Defined Benefit Plans with Accumulated Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Pension Plans [Member] | U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 481	$ 511
Accumulated benefit obligation	481	511
Fair value of plan assets	450	497
Pension Plans [Member] | Non-U. S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	796
Accumulated benefit obligation	777
Fair value of plan assets	594	$ 1
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	20
Accumulated benefit obligation	$ 20