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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Non-amortizable intangible assets $ 17,032 $ 17,296
Amortizable intangible assets 2,831 2,374
Total intangible assets, gross 19,863 19,670
Accumulated amortization (1,807) (1,713)
Intangible assets, net $ 18,056 $ 17,957