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Fair Value Measurements - Level 3 Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Goodwill, impairment loss $ 579  
Impairment of intangible assets, indefinite-lived (excluding goodwill) 108  
Impairment of intangible assets, finite-lived 60  
Carrying amount | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Goodwill 894  
Indefinite-lived intangible assets 492  
Definite-lived intangible assets 60  
Fair Value | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Goodwill 315  
Indefinite-lived intangible assets 384  
Definite-lived intangible assets 0  
Fair Value, Measurements, Nonrecurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Goodwill 315 $ 0
Indefinite-lived intangible assets 384 0
Definite-lived intangible assets 0 0
Total level 3 assets $ 699 $ 0