Commitments, Contingent Liabilities and Guarantees - Summary of Significant Commitments (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Commitments to extend credit
Long-term Purchase Commitment
Commitments	$ 84,505	$ 83,437
Letters of credit
Long-term Purchase Commitment
Commitments	2,137	2,009
Forward contracts related to residential mortgage loans held for sale
Long-term Purchase Commitment
Commitments	869	1,869
Capital commitments for private equity investments
Long-term Purchase Commitment
Commitments	171	163
Capital expenditures
Long-term Purchase Commitment
Commitments	85	94
Purchase obligations
Long-term Purchase Commitment
Commitments	$ 80	$ 113