Contingencies and Commitments - Additional Information (Detail) € in Millions, $ in Millions	1 Months Ended				6 Months Ended		12 Months Ended
	Feb. 28, 2018 USD ($)	Feb. 28, 2018 EUR (€)	Jan. 31, 2018 USD ($)	Jan. 31, 2018 EUR (€)	Jun. 30, 2018 USD ($) Installment	Jun. 30, 2018 EUR (€)	Dec. 31, 2018 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2018 EUR (€)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Management estimate for maximum exposure from class action							$ 97			€ 76
Partial reserve								$ 37	€ 34
Litigation settlement			$ 18	€ 15			8
Reduction in restructuring and other charges reserve			$ 22	€ 19
Accrued environmental reserves							$ 280				$ 294
Invitalia [Member]
Loss Contingencies [Line Items]
Cash payment	$ 23	€ 20
Number of installments, litigation payment | Installment					3
Installment amount					$ 8	€ 7
Net benefit in Restructuring and other charges					15
Reversal of previously accrued asset retirement obligations and environmental reserves					38
Accrued asset retirement obligations					36
Accrued environmental reserves					2
Charge to establish a liability for planned cash payment to Invitalia					$ 23