Goodwill and Mortgage Servicing Rights - Goodwill Changes During Period (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Goodwill [Roll Forward]
Balance at beginning of period	$ 52,731	$ 52,565
Changes during the period from:
Other	(25)	56
Balance at end of period	$ 52,706	$ 52,621