Income Tax - Additional Information (Detail) - USD ($)		3 Months Ended			6 Months Ended		12 Months Ended
	Jan. 01, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2018
Income Taxes [Line Items]
Net discrete tax benefits (charges) related to tax settlements		$ 26,000,000			$ (162,000,000)
Net discrete tax expense (benefits) excess foreign tax credits upon repatriation of taxed foreign earnings				$ (20,000,000)		$ (20,000,000)
Income tax rate	21.00%		35.00%
Provisional tax expense			$ 13,000,000		$ 17,000,000
Income tax rate for aggregate cash position			15.50%
Income tax rate for exceeds aggregate cash position			8.00%
Provisional charge		0	$ 149,000,000
Percentage of deduction for dividends from specified foreign corporations					100.00%
Provisional amount to tax expense		0	$ 23,000,000
Percentage of tax on foreign income in excess of a deemed return on tangible assets of foreign corporations	10.50%
Uncertain tax positions from expirations of statute of limitations				$ 1,000,000		$ 3,000,000
Earliest Tax Year [Member] | United States Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Tax years remain subject to examination					2014
Latest Tax Year [Member] | United States Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Tax years remain subject to examination					2015
State Tax Authorities [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination					2005
State Tax Authorities [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination					2015
Non-U.S. Jurisdictions [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination					2002
Non-U.S. Jurisdictions [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination					2016
Scenario Forecast [Member]
Income Taxes [Line Items]
Income tax rate							24.53%
Purification Solutions [Member]
Income Taxes [Line Items]
Net discrete tax benefits related to goodwill and long-lived assets impairment charges		30,000,000			$ 30,000,000
Maximum [Member]
Income Taxes [Line Items]
Impact of the Tax Cuts and Jobs Act of 2017		4,000,000			189,000,000
Provisional tax expense		4,000,000
Uncertain tax positions from expirations of statute of limitations		$ 1,000,000			$ 2,000,000