Commitments, Contingent Liabilities and Guarantees - Summary of Significant Commitments (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Commitments to extend credit
Long-term Purchase Commitment
Commitments	$ 79,019	$ 80,641
Forward contracts related to residential mortgage loans held for sale
Long-term Purchase Commitment
Commitments	2,505	1,952
Letters of credit
Long-term Purchase Commitment
Commitments	2,067	1,953
Purchase obligations
Long-term Purchase Commitment
Commitments	147	160
Capital commitments for private equity investments
Long-term Purchase Commitment
Commitments	135	124
Capital expenditures
Long-term Purchase Commitment
Commitments	$ 79	$ 78