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Financial Instruments and Fair Value Measurements - Fair Value (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Notional amount $ 213
Other current assets  
Debt Securities, Available-for-sale [Line Items]  
Other current assets 0
Accounts payable and other current liabilities  
Debt Securities, Available-for-sale [Line Items]  
Other current assets $ 0