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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Non-amortizable intangible assets $ 17,200 $ 17,201
Amortizable intangible assets 2,330 2,328
Total intangible assets, gross 19,530 19,529
Accumulated amortization (1,572) (1,527)
Intangible assets, net $ 17,958 $ 18,002