Commitments, Contingent Liabilities and Guarantees - Summary of Significant Commitments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Commitments to extend credit
Long-term Purchase Commitment
Commitments	$ 80,465	$ 81,570
Letters of credit
Long-term Purchase Commitment
Commitments	2,017	2,095
Forward contracts related to residential mortgage loans measured at fair value
Long-term Purchase Commitment
Commitments	1,310	650
Capital commitments for private equity investments
Long-term Purchase Commitment
Commitments	166	170
Purchase obligations
Long-term Purchase Commitment
Commitments	58	69
Capital expenditures
Long-term Purchase Commitment
Commitments	$ 64	$ 95