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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 |  |

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