Pension and Postretirement Benefits - Schedule of Contribution Information for Plans (Detail) - Pension Plans [Member] - Non-U.S. Pension Plans [Member] $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Contributions made through June 30, 2018	$ 1
Contributions expected for the remainder of 2018	9
Total contributions expected for 2018	$ 10	[1]

[1] All contributions expected for 2018 are associated with pension plans acquired in the Combination. Total contributions for our U.S. pension plans are not anticipated to be material.