Parent Company Financial Statements - Statement of Condition (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets:
Interest-bearing deposits with banks	$ 87,665	$ 101,593
Trading account assets	773	650
Other assets	44,806	37,902
Total assets	297,258	301,450
Liabilities:
Consolidated banking subsidiary	68	22
Consolidated non-banking subsidiaries and unconsolidated entities	896	214
Total liabilities	273,459	276,259
Shareholders’ equity	23,799	25,191	$ 27,363	$ 26,200
Total liabilities and shareholders' equity	297,258	301,450
Parent Company
Assets:
Interest-bearing deposits with banks	659	460
Trading account assets	454	425
Investment securities available-for-sale	279	260
Consolidated banking subsidiary	25,391	26,579
Consolidated non-banking subsidiaries	10,055	9,151
Unconsolidated entities	111	121
Consolidated banking subsidiary	2	0
Consolidated non-banking subsidiaries and unconsolidated entities	6,816	3,512
Other assets	230	205
Total assets	43,997	40,713
Liabilities:
Accrued expenses and other liabilities	615	509
Long-term debt	18,619	14,777
Total liabilities	20,198	15,522
Shareholders’ equity	23,799	25,191
Total liabilities and shareholders' equity	$ 43,997	$ 40,713