Parent Company Financial Statements - Statement of Condition (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets:
Interest-bearing deposits with banks	$ 106,358	$ 116,960
Trading account assets	758	815
Investment securities available-for-sale	73,399	59,048
Other assets	37,615	36,510
Total assets	314,624	314,706
Liabilities:
Notes and other payables to consolidated banking and non-banking subsidiaries and unconsolidated entities	2,303	104
Total liabilities	287,261	288,506
Shareholders’ equity	27,363	26,200	$ 24,431	$ 24,737
Total liabilities and shareholders' equity	314,624	314,706
Parent Company
Assets:
Interest-bearing deposits with banks	482	492
Trading account assets	440	412
Investment securities available-for-sale	150	100
Consolidated banking subsidiary	27,821	26,204
Consolidated non-banking subsidiaries	9,060	8,807
Unconsolidated entities	122	124
Consolidated banking subsidiary	80	81
Consolidated non-banking subsidiaries and unconsolidated entities	5,029	3,885
Other assets	256	277
Total assets	43,440	40,382
Liabilities:
Accrued expenses and other liabilities	523	453
Long-term debt	13,250	13,625
Total liabilities	16,076	14,182
Shareholders’ equity	27,364	26,200
Total liabilities and shareholders' equity	$ 43,440	$ 40,382