Variable Interest Entities - Carrying Amounts and Classification of Significant Variable Interests (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 14,619	$ 17,675
Non-marketable and other equity securities	2,543	1,802
Accrued interest receivable and other assets	1,928	3,206
Total assets	211,478	115,511
Other liabilities	2,587	3,972
Long-term debt	2,570	844
Total liabilities	194,869	107,078
Investments in Affordable Housing Projects [Abstract]
Investments in qualified affordable housing projects	954	616
Related other liabilities of unfunded credit commitments	482	370
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Cash and cash equivalents	13	15
Non-marketable and other equity securities	768	422
Accrued interest receivable and other assets	31	1
Total assets	812	438
Other liabilities	18	1
Long-term debt	0
Total liabilities	18	1
Maximum Exposure to Loss in Unconsolidated VIEs	794
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Cash and cash equivalents	0	0
Non-marketable and other equity securities	1,233	859
Accrued interest receivable and other assets	6	0
Total assets	1,239	859
Other liabilities	482	370
Long-term debt	90
Total liabilities	572	370
Maximum Exposure to Loss in Unconsolidated VIEs	1,233	859
Non-marketable securities | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum Exposure to Loss in Unconsolidated VIEs	$ 1,233	$ 859