Commitments, Contingent Liabilities and Guarantees - Summary of Significant Commitments (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Commitments to extend credit
Long-term Purchase Commitment
Commitments	$ 84,732	$ 83,437
Letters of credit
Long-term Purchase Commitment
Commitments	2,046	2,009
Forward contracts related to residential mortgage loans held for sale
Long-term Purchase Commitment
Commitments	960	1,869
Capital commitments for private equity investments
Long-term Purchase Commitment
Commitments	173	163
Purchase obligations
Long-term Purchase Commitment
Commitments	102	113
Capital expenditures
Long-term Purchase Commitment
Commitments	$ 97	$ 94