Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Non-amortizable intangible assets	$ 17,296	$ 17,201
Amortizable intangible assets	2,374	2,328
Total intangible assets, gross	19,670	19,529	$ 20,057
Accumulated amortization	(1,713)	(1,527)
Intangible assets, net	$ 17,957	$ 18,002