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Income Taxes - Tax Jurisdictions and Years Currently under Audit Exam (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017
Income Tax Examination [Line Items] |  |
Estimated benefit to tax expense |  | $ 200
Belgium | Earliest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam | 2015 |
Belgium | Latest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam | 2016 |
Brazil | Earliest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam | 2011 |
Brazil | Latest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam | 2012 |
CANADA | Earliest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam | 2012 |
CANADA | Latest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam | 2014 |
France | Earliest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam | 2010 |
France | Latest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam | 2015 |
Germany | Earliest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam | 2007 |
Germany | Latest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam | 2015 |
SPAIN | Earliest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam | 2010 |
SPAIN | Latest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam | 2014 |
United Kingdom | Earliest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam | 2011 |
United Kingdom | Latest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam | 2014 |
United States | Earliest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam |  | 2010
United States | Latest tax year under exam |  |
Income Tax Examination [Line Items] |  |
Tax years currently under audit exam |  | 2014

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