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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Indefinite-life intangible assets $ 17,379 $ 17,492
Definite-life intangible assets 3,018 2,907
Total intangible assets, gross 20,397 20,399
Accumulated amortization (1,984) (1,917)
Intangible assets, net $ 18,413 $ 18,482