Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Cash and Cash Equivalents [Abstract]
Cash and due from banks	$ 1,713	$ 2,201
Interest bearing deposits with the Federal Reserve Bank	13,246	5,686
Interest bearing deposits with other institutions	5,147	5,773
Securities purchased under agreements to resell	420	607
Other short-term investment securities	80	352
Total cash and cash equivalents	$ 20,606	$ 14,619