Variable Interest Entities - Carrying Amounts and Classification of Significant Variable Interests (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 15,398	$ 14,619
Non-marketable and other equity securities	2,645	2,543
Accrued interest receivable and other assets	2,777	1,928
Total assets	214,389	211,478
Other liabilities	2,721	2,587
Long-term debt	3,367	2,570
Total liabilities	198,113	194,869
Maximum exposure to loss in unconsolidated VIEs	1,356	1,233
Investments in qualified affordable housing projects, net	1,134	954
Consolidated
Variable Interest Entity [Line Items]
Cash and cash equivalents	10	13
Non-marketable and other equity securities	815	768
Accrued interest receivable and other assets	34	31
Total assets	859	812
Other liabilities	22	18
Long-term debt	0	0
Total liabilities	22	18
Maximum exposure to loss in unconsolidated VIEs	837
Unconsolidated
Variable Interest Entity [Line Items]
Cash and cash equivalents	0	0
Non-marketable and other equity securities	1,356	1,233
Accrued interest receivable and other assets	6	6
Total assets	1,362	1,239
Other liabilities		482
Long-term debt	90	90
Total liabilities	704	572
Non-marketable securities | Unconsolidated
Variable Interest Entity [Line Items]
Maximum exposure to loss in unconsolidated VIEs	$ 1,356	$ 1,233