Goodwill, Mortgage Servicing Rights, and Other Intangible Assets - Goodwill Changes During Period (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Goodwill [Roll Forward]
Balance at beginning of period	$ 52,747	$ 52,620	$ 52,565	$ 52,634
Changes during the period from:
Business combinations	0	0	0	29
Other	(30)	91	152	48
Balance at end of period	$ 52,717	$ 52,711	$ 52,717	$ 52,711