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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Indefinite-life intangible assets $ 17,615 $ 17,492
Definite-life intangible assets 3,059 2,907
Total intangible assets, gross 20,674 20,399
Accumulated amortization (1,983) (1,917)
Intangible assets, net $ 18,691 $ 18,482