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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Non-amortizable intangible assets $ 17,201 $ 17,671  
Amortizable intangible assets 2,328 2,386  
Total intangible assets, gross 19,529 20,057 $ 19,319
Accumulated amortization (1,527) (1,418)  
Intangible assets, net $ 18,002 $ 18,639