Goodwill and Mortgage Servicing Rights - Changes During Period (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Changes in the carrying amount of goodwill [Abstract]
Balance at beginning of period	$ 50,315	$ 49,248	$ 47,823
Changes during the period from:
Business combinations	1,426	1,073	1,412
Other	(79)	(6)	13
Balance at end of period	$ 51,662	$ 50,315	$ 49,248