Fair Value Measurements - Quantitative Information about Recurring Fair Value Measurement of Assets and Liabilities Classified as Level 3 (Detail) $ in Millions		Jun. 30, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($)
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Mortgage servicing rights		$ 22	$ 16
Domestic deposits		(500)	(535)
Long-term debt	[1]	(16,026)	(17,236)
Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-term debt		(2,093)	(1,853)
Asset-backed securities
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Asset-backed securities available-for-sale		113	120
Interest rate contracts
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative assets (liability		(4)	0
Foreign exchange contracts
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative assets (liability		0	(2)
Equity contracts
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative assets (liability		(282)	46
Credit contracts
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative assets (liability		(1)	(2)
Other Contracts
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative assets (liability		$ (47)	$ (33)
Probability to fund for rate lock commitments | Interest rate contracts | Recurring | Minimum | Market comparable adjusted for probability to fund and, where applicable, option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.49	0.36
Probability to fund for rate lock commitments | Interest rate contracts | Recurring | Maximum | Market comparable adjusted for probability to fund and, where applicable, option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.99	0.99
Probability to fund for rate lock commitments | Interest rate contracts | Recurring | Weighted Average | Market comparable adjusted for probability to fund and, where applicable, option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.83	0.83
Interest rate yield curve | Interest rate contracts | Recurring | Market comparable adjusted for probability to fund and, where applicable, option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.09	0.08
Implied volatility of currency pairs | Recurring | Minimum | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-Term Debt, Measurement Input			0
Implied volatility of currency pairs | Recurring | Maximum | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-Term Debt, Measurement Input			0.09
Implied volatility of currency pairs | Recurring | Weighted Average | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-Term Debt, Measurement Input			0.06
Implied volatility of currency pairs | Foreign exchange contracts | Recurring | Minimum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input			0
Implied volatility of currency pairs | Foreign exchange contracts | Recurring | Maximum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input			0.09
Implied volatility of currency pairs | Foreign exchange contracts | Recurring | Weighted Average | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input			0.06
Cross-currency basis | Foreign exchange contracts | Recurring | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.0021	(0.0086)
Equity / Equity Index volatility | Recurring | Minimum | Option adjusted discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Domestic Deposits, Measurement Input		0.08	0.08
Equity / Equity Index volatility | Recurring | Minimum | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-Term Debt, Measurement Input		0.08	0.08
Equity / Equity Index volatility | Recurring | Maximum | Option adjusted discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Domestic Deposits, Measurement Input		0.25	0.21
Equity / Equity Index volatility | Recurring | Maximum | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-Term Debt, Measurement Input		0.59	0.71
Equity / Equity Index volatility | Recurring | Weighted Average | Option adjusted discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Domestic Deposits, Measurement Input		0.20	0.15
Equity / Equity Index volatility | Recurring | Weighted Average | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-Term Debt, Measurement Input		0.31	0.31
Equity / Equity Index volatility | Equity contracts | Recurring | Minimum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.08	0.08
Equity / Equity Index volatility | Equity contracts | Recurring | Maximum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.96	0.85
Equity / Equity Index volatility | Equity contracts | Recurring | Weighted Average | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.45	0.40
Equity / Equity and Equity / Index correlation | Recurring | Minimum | Option adjusted discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Domestic Deposits, Measurement Input		0.49	0.49
Equity / Equity and Equity / Index correlation | Recurring | Minimum | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-Term Debt, Measurement Input		0.44	0.44
Equity / Equity and Equity / Index correlation | Recurring | Maximum | Option adjusted discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Domestic Deposits, Measurement Input		0.89	0.85
Equity / Equity and Equity / Index correlation | Recurring | Maximum | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-Term Debt, Measurement Input		0.97	0.98
Equity / Equity and Equity / Index correlation | Recurring | Weighted Average | Option adjusted discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Domestic Deposits, Measurement Input		0.66	0.62
Equity / Equity and Equity / Index correlation | Recurring | Weighted Average | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-Term Debt, Measurement Input		0.85	0.82
Equity / Equity and Equity / Index correlation | Equity contracts | Recurring | Minimum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.44	0.44
Equity / Equity and Equity / Index correlation | Equity contracts | Recurring | Maximum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.97	0.98
Equity / Equity and Equity / Index correlation | Equity contracts | Recurring | Weighted Average | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.85	0.81
Equity forward price | Equity contracts | Recurring | Minimum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input | $ / shares		40
Equity forward price | Equity contracts | Recurring | Maximum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input | $ / shares		5,108
Equity forward price | Equity contracts | Recurring | Weighted Average | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input | $ / shares		1,136
Equity dividend yields and forward price | Equity contracts | Recurring | Minimum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input			(0.04)
Equity dividend yields and forward price | Equity contracts | Recurring | Maximum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input			0.01
Equity dividend yields and forward price | Equity contracts | Recurring | Weighted Average | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input			0
Credit default swap spreads | Recurring | Option adjusted discounted cash flows | Structured notes
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Long-Term Debt, Measurement Input		0.1233	0.0798
Credit default swap spreads | Credit contracts | Recurring | Minimum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.0241	0.0076
Credit default swap spreads | Credit contracts | Recurring | Maximum | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.0410	0.0325
Credit default swap spreads | Credit contracts | Recurring | Weighted Average | Option pricing model
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		0.0389	0.0234
Conversion rate | Other Contracts | Recurring | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		1.6	1.6
Expected duration | Other Contracts | Recurring | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Derivative Asset (Liability) Net, Measurement Input		1.5	1
Market assumptions related to yields for comparable instruments | Asset-backed securities | Recurring | Minimum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Debt Securities, Available-for-Sale, Measurement Input		0.02	0.03
Market assumptions related to yields for comparable instruments | Asset-backed securities | Recurring | Maximum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Debt Securities, Available-for-Sale, Measurement Input		0.03	0.04
Market assumptions related to yields for comparable instruments | Asset-backed securities | Recurring | Weighted Average | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Debt Securities, Available-for-Sale, Measurement Input		0.02	0.03
Constant prepayment rates | Recurring | Minimum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Servicing Asset, Measurement Input		0.06	0.10
Constant prepayment rates | Recurring | Maximum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Servicing Asset, Measurement Input		0.15	0.16
Constant prepayment rates | Recurring | Weighted Average | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Servicing Asset, Measurement Input		0.06	0.12
Discount rate | Recurring | Minimum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Servicing Asset, Measurement Input		0.08	0.08
Discount rate | Recurring | Maximum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Servicing Asset, Measurement Input		0.13	0.13
Discount rate | Recurring | Weighted Average | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Servicing Asset, Measurement Input		0.08	0.08
Estimated annualized costs to service | Recurring | Minimum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Servicing Asset, Measurement Input		72	72
Estimated annualized costs to service | Recurring | Maximum | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Servicing Asset, Measurement Input		76	85
Estimated annualized costs to service | Recurring | Weighted Average | Discounted cash flows
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]
Servicing Asset, Measurement Input		74	75

[1] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at June 30, 2022 and December 31, 2021. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 17, "Variable Interest Entities," for additional information. June 30, 2022December 31, 2021(in millions)AssetsLoans$118 $46 Other assets46 55 Total assets$164 $101 LiabilitiesInterest, taxes and other liabilities$28 $9 Total liabilities$28 $9