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Fair Value Measurements - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
reporting_unit
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 charge   $ 579  
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-term debt, fair value   4,260 $ 4,950
EMEA      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Goodwill impairment charge $ 579 579  
Impairment of intangible assets (excluding goodwill) $ 168 $ 168  
EMEA | Discounted Cash Flow Analysis | Goodwill | Measurement Input, Discount Rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Servicing asset, measurement input 0.12    
EMEA | Relief-From-Royalty Method | Minimum | Other Intangible Assets | Measurement Input, Discount Rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Servicing asset, measurement input 0.115    
EMEA | Relief-From-Royalty Method | Minimum | Other Intangible Assets | Measurement Input, Royalty Rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Servicing asset, measurement input 0.015    
EMEA | Relief-From-Royalty Method | Maximum | Other Intangible Assets | Measurement Input, Discount Rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Servicing asset, measurement input 0.16    
EMEA | Relief-From-Royalty Method | Maximum | Other Intangible Assets | Measurement Input, Royalty Rate      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Servicing asset, measurement input 0.035