Commitments, Contingent Liabilities and Guarantees - Summary of Significant Commitments (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Commitments to extend credit
Long-term Purchase Commitment
Commitments	$ 80,272	$ 80,680
Letters of credit
Long-term Purchase Commitment
Commitments	1,879	1,952
Forward contracts related to residential mortgage loans measured at fair value
Long-term Purchase Commitment
Commitments	805	881
Capital commitments for private equity investments
Long-term Purchase Commitment
Commitments	217	219
Capital expenditures
Long-term Purchase Commitment
Commitments	113	80
Purchase obligations
Long-term Purchase Commitment
Commitments	$ 20	$ 27