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Fair Value Measurements - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
reporting_unit
Dec. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Number of reporting units | reporting_unit   4    
Naples, Italy Manufacturing Plant        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of assets held-for-sale $ 25      
Assets held-for-sale, fair value 0      
Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term debt, fair value     $ 4,170 $ 4,970
EMEA        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Goodwill, impairment loss   $ 579 $ 579  
Impairment of intangible assets (excluding goodwill)   $ 168    
Goodwill | Discounted Cash Flow Analysis | EMEA | Measurement Input, Discount Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Goodwill, measurement input   0.12    
Minimum | Other Intangible Assets | Relief-From-Royalty Method | EMEA | Measurement Input, Discount Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Intangible assets (excluding goodwill), measurement input   0.115    
Minimum | Other Intangible Assets | Relief-From-Royalty Method | EMEA | Measurement Input, Royalty Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Intangible assets (excluding goodwill), measurement input   0.015    
Maximum | Other Intangible Assets | Relief-From-Royalty Method | EMEA | Measurement Input, Discount Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Intangible assets (excluding goodwill), measurement input   0.16    
Maximum | Other Intangible Assets | Relief-From-Royalty Method | EMEA | Measurement Input, Royalty Rate        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Intangible assets (excluding goodwill), measurement input   0.035    
South Africa Operations        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of assets held-for-sale 35      
Assets held-for-sale, fair value $ 5