Income Tax - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended			9 Months Ended		12 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2018
Income Taxes [Line Items]
Net discrete tax benefits (charges) related to tax settlements		$ 23		$ (5)	$ (139)	$ 15
Impact of the Tax Cuts and Jobs Act of 2017		4			(185)
Net tax benefits from change in valuation allowance		20			20
Income tax rate	21.00%		35.00%
Provisional tax expense					17
Income tax rate for aggregate cash position			15.50%
Income tax rate for exceeds aggregate cash position			8.00%
(Provision) benefit for income taxes for deemed repatriation		5			$ (144)
Percentage of deduction for dividends from specified foreign corporations					100.00%
Provisional amount to tax expense		1			$ 24
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		0			$ 2
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
Maximum [Member]
Income Taxes [Line Items]
Provisional tax expense		1
Uncertain tax positions from expirations of statute of limitations				$ 1		$ 3
Scenario Forecast [Member]
Income Taxes [Line Items]
Income tax rate							24.53%
Purification Solutions [Member]
Income Taxes [Line Items]
Net discrete tax (expense) benefits related to goodwill and long-lived assets impairment charges		$ (2)			$ 28