Accounting for Transfers and Servicing of Financial Assets and Variable Interest Entities - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended			12 Months Ended
		Mar. 31, 2023		Mar. 31, 2022	Dec. 31, 2022
Variable Interest Entity [Line Items]
Assets related to consolidated VIEs		$ 682,377			$ 674,805
Liabilities related to consolidated VIEs		628,923			623,573
Available-for-sale securities	[1]	65,491	[2]		72,910
Community Development And Tax Advantaged Investments [Member]
Variable Interest Entity [Line Items]
Federal and state income tax credits recognized in tax expense		138		$ 113
Expense related to investments		130		102
Investment tax credits		164		13
Financial Support Waived Fees [Member]
Variable Interest Entity [Line Items]
Financial or other support to money market funds				$ 58
Variable Interest Entity Not Primary Beneficiary [Member] | Private Investment Funds and Partnerships [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss		309			310
Assets related to consolidated VIEs		186			177
Variable Interest Entity Not Primary Beneficiary [Member] | Community Development And Tax Advantaged Investments [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss		9,662			9,761
Assets related to consolidated VIEs		5,667			5,452
Liabilities related to consolidated VIEs		2,680			2,416
Variable Interest Entity Not Primary Beneficiary [Member] | Minimum [Member]
Variable Interest Entity [Line Items]
Aggregate amount of investments in unconsolidated VIEs		1			1
Variable Interest Entity Not Primary Beneficiary [Member] | Maximum [Member]
Variable Interest Entity [Line Items]
Aggregate amount of investments in unconsolidated VIEs		96			116
Variable Interest Entity Primary Beneficiary [Member] | Senior Notes [Member]
Variable Interest Entity [Line Items]
Available-for-sale securities		3,000			3,400
Collateral held related to senior notes		3,500			4,000
Variable Interest Entity Primary Beneficiary [Member] | Community Development And Tax Advantaged Investments [Member]
Variable Interest Entity [Line Items]
Assets related to consolidated VIEs		6,000			5,900
Liabilities related to consolidated VIEs		4,400			4,200
Variable Interest Entity Primary Beneficiary [Member] | Tender Option Bond Program [Member]
Variable Interest Entity [Line Items]
Assets related to consolidated VIEs		1,300			1,500
Liabilities related to consolidated VIEs		$ 1,000			$ 1,000

[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

[2] The weighted-average maturity of total held-to-maturity investment securities was 9.2 years at December 31, 2022, with a corresponding weighted-average yield of 2.18 percent. The weighted-average maturity of total available-for-sale investment securities was 7.4 years at December 31, 2022, with a corresponding weighted-average yield of 2.94 percent.