Commitments, Contingent Liabilities and Guarantees - Summary of Significant Commitments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Commitments to extend credit
Long-term Purchase Commitment
Commitments	$ 81,570	$ 83,437
Letters of credit
Long-term Purchase Commitment
Commitments	2,095	2,009
Forward contracts related to residential mortgage loans measured at fair value
Long-term Purchase Commitment
Commitments	650	1,869
Capital commitments for private equity investments
Long-term Purchase Commitment
Commitments	170	163
Capital expenditures
Long-term Purchase Commitment
Commitments	95	94
Purchase obligations
Long-term Purchase Commitment
Commitments	$ 69	$ 113