Contingencies and Commitments - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Project	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Environmental remediation reserve balance, current	$ 31		$ 31		$ 44
Liabilities incurred	2		4		19
Payments related to remediation expenses applied against the reserve	2	$ 5	12	$ 19
Increase (Decrease) in reserves due to effects of foreign currency translation	2	$ 1	2	6
Increase (decrease) in remediation reserve				15
Remediation reserve balance, revision			1		3
Reclassification of amounts included in asset retirement obligations				1
Active or future remediation for significant sites	207		207		214
Remediation reserve balance	269		269		280	$ 294
Cost of Goods Sold [Member]
Loss Contingencies [Line Items]
Increase (decrease) in remediation reserve				15
Restructuring And Other Charges [Member]
Loss Contingencies [Line Items]
Liabilities incurred				2
Remediation reserve balance, revision				2
Sherwin [Member]
Loss Contingencies [Line Items]
Liabilities incurred				9
Remediation reserve balance	38		$ 38		38
Portovesme Italy [Member]
Loss Contingencies [Line Items]
Remediation reserve balance, revision				2
Other Sites [Member]
Loss Contingencies [Line Items]
Liabilities incurred				$ 8
Number of remediation projects | Project			35
Remediation reserve balance	$ 62		$ 62		$ 66
Massena, New York [Member] | Minimum [Member]
Loss Contingencies [Line Items]
Environmental remediation work completion period			4 years
Massena, New York [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Environmental remediation work completion period			8 years
Sherwin, Texas [Member]
Loss Contingencies [Line Items]
Beginning of expected term for reuse of residue bed			8 years
Ending of expected term for reuse of residue bed			12 years