Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets
Allowance for loan losses	$ 5,193	$ 4,345
Employee benefits	1,342	987
Accrued expenses and other	8,577	3,955
Non-U.S. operations	1,148	900
Tax attribute carryforwards	365	615
Gross deferred tax assets	16,625	10,802
Valuation allowance	(198)	(378)
Deferred tax assets, net of valuation allowance	16,427	10,424
Deferred tax liabilities
Depreciation and amortization	2,044	3,289
Mortgage servicing rights, net of hedges	1,864	2,049
Leasing transactions	2,843	4,227
Other, net	3,801	4,459
Gross deferred tax liabilities	10,552	14,024
Net deferred tax assets	5,875
Net deferred tax (liabilities)		$ (3,600)
FTC carryforwards	81
U.S. federal
Deferred tax liabilities
NOL carryforwards	648
Other tax attributes	256
Non-U.S.
Deferred tax liabilities
NOL carryforwards	308
State and local
Deferred tax liabilities
NOL carryforwards	$ 1,000