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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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Estimated amount of benefit resulting from favorable tax position.

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