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Income Taxes - Tax Jurisdictions and Years Currently under Audit Exam (Details) $ in Millions | 3 Months Ended
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Dec. 31, 2017 USD ($)
Income Tax Examination [Line Items] |
Estimated benefit to tax expense | $ 25
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 | 2013
CANADA | Latest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2014
CHINA | Earliest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2008
CHINA | Latest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2016
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 | 2016
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
JAPAN |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2016
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
SWITZERLAND | Earliest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2011
SWITZERLAND | 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

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