Goodwill, Mortgage Servicing Rights, and Other Intangible Assets - Goodwill Changes During Period (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Balance at beginning of period	$ 52,634	$ 51,662	$ 50,315
Changes during the period from:
Business combinations	29	917	1,426
Other	(98)	55	(79)
Balance at end of period	$ 52,565	$ 52,634	$ 51,662
CIFM
Business Acquisition [Line Items]
Percentage interest acquired		51.00%