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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Non-amortizable intangible assets $ 17,288 $ 17,671
Amortizable intangible assets 2,341 2,386
Total intangible assets, gross 19,629 20,057
Accumulated amortization (1,493) (1,418)
Intangible assets, net $ 18,136 $ 18,639