Variable Interest Entities - Carrying Amounts and Classification of Significant Variable Interests (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 20,606	$ 14,619
Non-marketable and other equity securities	2,605	2,543
Accrued interest receivable and other assets	3,088	1,928
Total assets	220,355	211,478
Other liabilities	2,817	2,587
Long-term debt	2,571	2,570
Total liabilities	203,995	194,869
Maximum exposure to loss in unconsolidated VIEs	1,231	1,233
Investments in qualified affordable housing projects, net	957	954
Consolidated
Variable Interest Entity [Line Items]
Cash and cash equivalents	7	13
Non-marketable and other equity securities	888	768
Accrued interest receivable and other assets	31	31
Total assets	926	812
Other liabilities	19	18
Long-term debt	0	0
Total liabilities	19	18
Maximum exposure to loss in unconsolidated VIEs	907
Unconsolidated
Variable Interest Entity [Line Items]
Cash and cash equivalents	0	0
Non-marketable and other equity securities	1,231	1,233
Accrued interest receivable and other assets	6	6
Total assets	1,237	1,239
Other liabilities	469	482
Long-term debt	90	90
Total liabilities	559	572
Non-marketable securities | Unconsolidated
Variable Interest Entity [Line Items]
Maximum exposure to loss in unconsolidated VIEs	$ 1,231	$ 1,233