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Employee Benefit Plans - Additional Information (Details)
3 Months Ended
Dec. 31, 2018
USD ($)
Foreign Pension Plans, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Actual contributions to benefit plans in period $ 1,000,000
Estimated future contributions in current fiscal year 5,000,000
Remeasurement due to curtailment gain 18,000,000
United States Pension Plans of US Entity, Defined Benefit [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Actual contributions to benefit plans in period $ 0