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Intangible Assets - Schedule of Carrying Amounts of Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Finite-lived intangible assets $ 13,746 $ 14,350
Indefinite-lived intangible assets 2,750 2,750
Intangible assets, net $ 16,496 $ 17,100