Goodwill - Goodwill Activity (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning of year balance	$ 15,341	$ 15,351
Acquisitions	184	0
Other	(1)	(10)
End of year balance	$ 15,524	$ 15,341