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Fair Value Measurements (Narrative) (Details)
3 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
reporting_unit
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Number of reporting units | reporting_unit       4    
Goodwill, impairment loss       $ 0 $ 579,000,000 $ 0
Impairment of intangible assets (excluding goodwill)       0 168,000,000 $ 0
Significant Other Observable Inputs (Level 2)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Long-term debt, fair value       5,000,000,000.00 4,170,000,000  
EMEA            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Goodwill, impairment loss     $ 579,000,000 $ 579,000,000 579,000,000  
Impairment of intangible assets (excluding goodwill)     $ 168,000,000   $ 168,000,000  
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   $ 35,000,000        
Assets held-for-sale, fair value   $ 5,000,000        
Naples, Italy Manufacturing Plant            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Impairment of assets held-for-sale $ 43,000,000          
Assets held-for-sale, fair value $ 0