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Fair Value Measurements - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
reporting_unit
Dec. 31, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Number of reporting units | reporting_unit     4  
Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-term debt, fair value $ 4,920   $ 4,920 $ 4,170
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) $ 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   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   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   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   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   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   $ 5