Parent Company Financial Statements - Statement of Condition (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets:
Interest-bearing deposits with banks	$ 68,965	$ 73,040
Trading account assets	914	860
Investment securities available-for-sale	53,815	45,148
Other assets	34,011	34,789
Total assets	245,610	244,596
Liabilities:
Total liabilities	221,179	219,859
Shareholders’ equity	24,431	24,737	$ 22,270	$ 21,193
Total liabilities and shareholders' equity	245,610	244,596
Parent Company
Assets:
Interest-bearing deposits with banks	428	486
Trading account assets	393	357
Investment securities available-for-sale	250	224
Consolidated banking subsidiary	25,451	25,966
Consolidated non-banking subsidiaries	7,240	6,726
Unconsolidated entities	117	106
Consolidated banking subsidiary	0	64
Consolidated non-banking subsidiaries and unconsolidated entities	3,361	2,337
Other assets	270	96
Total assets	37,510	36,362
Liabilities:
Accrued expenses and other liabilities	696	685
Long-term debt	12,383	10,940
Total liabilities	13,079	11,625
Shareholders’ equity	24,431	24,737
Total liabilities and shareholders' equity	$ 37,510	$ 36,362