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Fair Value Measurements - Quantitative Information about Recurring Fair Value Measurement of Assets and Liabilities Classified as Level 3 (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 312 $ 703 $ 2,088
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value (1,094) (1,128) (1,337)
Deposits [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value [1] (646) [2],[3] (774) [2],[3] (925)
Long-term debt [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value [1] (448) [2],[3] (354) [2],[3] (412)
Interest rate contracts [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [4] 34 10 2
Foreign exchange contracts [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [4] 9 [3] (1) [3] (1)
Equity contracts [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [4] 119 [3] 72 [3] (52)
Credit contracts [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [4] 63 59 52
Other Contracts [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [4] (59) (75) (35)
Trading assets, excluding derivatives [Member] | Collateralized debt obligations [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value [5]   0 100
Trading assets, excluding derivatives [Member] | Residential mortgage asset-backed securities [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value [5] 15 17 16
Trading assets, excluding derivatives [Member] | Student loan asset-backed securities [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value [5]   0 92
Trading assets, excluding derivatives [Member] | Corporate and other domestic debt securities [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value [5] 0 510 1,803
Available-for-sale securities [Member] | Other [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value [6] $ 131 111 107
Other assets [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value [7]   $ 0 $ 4
Measurement Input, Prepayment Rates [Member] | Residential mortgage asset-backed securities [Member] | Recurring [Member] | Valuation Technique, Broker Quotes or Consensus Pricing [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Debt Securities, Trading, Measurement Input 0.10 0.01  
Measurement Input, Default Rates [Member] | Residential mortgage asset-backed securities [Member] | Recurring [Member] | Valuation Technique, Broker Quotes or Consensus Pricing [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Debt Securities, Trading, Measurement Input 0.05 0.08  
Measurement Input, Loss Severity Rates [Member] | Residential mortgage asset-backed securities [Member] | Recurring [Member] | Valuation Technique, Broker Quotes or Consensus Pricing [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Debt Securities, Trading, Measurement Input 0.65 0.70  
Measurement Input, Discount Margin [Member] | Residential mortgage asset-backed securities [Member] | Recurring [Member] | Valuation Technique, Broker Quotes or Consensus Pricing [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Debt Securities, Trading, Measurement Input 0.0500 0.0600  
Measurement Input, Spread Volatility on Collateral Assets [Member] | Corporate and other domestic debt securities [Member] | Recurring [Member] | Valuation Technique, Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Debt Securities, Trading, Measurement Input   0.04  
Measurement Input, Correlation between Insurance Claim Shortfall and Collateral Value [Member] | Corporate and other domestic debt securities [Member] | Recurring [Member] | Valuation Technique, Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Debt Securities, Trading, Measurement Input   0.80  
Measurement Input, Probability to Fund for Rate Lock Commitments [Member] | Interest rate contracts [Member] | Recurring [Member] | Minimum [Member] | Valuation Technique, Market Comparable Adjusted for Probability to Fund [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input 0.41 0.42  
Measurement Input, Probability to Fund for Rate Lock Commitments [Member] | Interest rate contracts [Member] | Recurring [Member] | Maximum [Member] | Valuation Technique, Market Comparable Adjusted for Probability to Fund [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input 1 1  
Measurement Input, Probability to Fund for Rate Lock Commitments [Member] | Interest rate contracts [Member] | Recurring [Member] | Weighted Average [Member] | Valuation Technique, Market Comparable Adjusted for Probability to Fund [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [8] 0.78 0.80  
Measurement Input, Interest Rate Yield Curve [Member] | Interest rate contracts [Member] | Recurring [Member] | Minimum [Member] | Valuation Technique, Market Comparable Adjusted for Probability to Fund [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input 0.04    
Measurement Input, Interest Rate Yield Curve [Member] | Interest rate contracts [Member] | Recurring [Member] | Maximum [Member] | Valuation Technique, Market Comparable Adjusted for Probability to Fund [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input 0.07    
Measurement Input, Interest Rate Yield Curve [Member] | Interest rate contracts [Member] | Recurring [Member] | Weighted Average [Member] | Valuation Technique, Market Comparable Adjusted for Probability to Fund [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [8] 0.06    
Measurement Input, Interest Rate Transaction Execution [Member] | Interest rate contracts [Member] | Recurring [Member] | Valuation Technique, Market Comparable Adjusted for Probability to Fund [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input 0.90 0.90  
Measurement Input, Implied Volatility of Currency Pairs [Member] | Deposits [Member] | Recurring [Member] | Minimum [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Domestic Deposits, Measurement Input [2],[3] 0.09 0.06  
Measurement Input, Implied Volatility of Currency Pairs [Member] | Deposits [Member] | Recurring [Member] | Maximum [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Domestic Deposits, Measurement Input [2],[3] 0.11 0.11  
Measurement Input, Implied Volatility of Currency Pairs [Member] | Deposits [Member] | Recurring [Member] | Weighted Average [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Domestic Deposits, Measurement Input [2],[3],[8] 0.10 0.08  
Measurement Input, Implied Volatility of Currency Pairs [Member] | Long-term debt [Member] | Recurring [Member] | Minimum [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Long-term Debt, Measurement Input [2],[3] 0.09 0.06  
Measurement Input, Implied Volatility of Currency Pairs [Member] | Long-term debt [Member] | Recurring [Member] | Maximum [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Long-term Debt, Measurement Input [2],[3] 0.11 0.11  
Measurement Input, Implied Volatility of Currency Pairs [Member] | Long-term debt [Member] | Recurring [Member] | Weighted Average [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Long-term Debt, Measurement Input [2],[3],[8] 0.10 0.08  
Measurement Input, Implied Volatility of Currency Pairs [Member] | Foreign exchange contracts [Member] | Recurring [Member] | Minimum [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [3] 0.09 0.06  
Measurement Input, Implied Volatility of Currency Pairs [Member] | Foreign exchange contracts [Member] | Recurring [Member] | Maximum [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [3] 0.11 0.11  
Measurement Input, Implied Volatility of Currency Pairs [Member] | Foreign exchange contracts [Member] | Recurring [Member] | Weighted Average [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [3],[8] 0.10 0.08  
Measurement Input, Cross-currency Basis [Member] | Foreign exchange contracts [Member] | Recurring [Member] | Minimum [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input (0.0009)    
Measurement Input, Cross-currency Basis [Member] | Foreign exchange contracts [Member] | Recurring [Member] | Maximum [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input 0.0040    
Measurement Input, Cross-currency Basis [Member] | Foreign exchange contracts [Member] | Recurring [Member] | Weighted Average [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [8] 0.0024    
Measurement Input, Equity / Equity Index Volatility [Member] | Deposits [Member] | Recurring [Member] | Minimum [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Domestic Deposits, Measurement Input [2],[3] 0 0.07  
Measurement Input, Equity / Equity Index Volatility [Member] | Deposits [Member] | Recurring [Member] | Maximum [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Domestic Deposits, Measurement Input [2],[3] 0.42 0.28  
Measurement Input, Equity / Equity Index Volatility [Member] | Deposits [Member] | Recurring [Member] | Weighted Average [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Domestic Deposits, Measurement Input [2],[3],[8] 0.15 0.13  
Measurement Input, Equity / Equity Index Volatility [Member] | Long-term debt [Member] | Recurring [Member] | Minimum [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Long-term Debt, Measurement Input [2],[3] 0 0.07  
Measurement Input, Equity / Equity Index Volatility [Member] | Long-term debt [Member] | Recurring [Member] | Maximum [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Long-term Debt, Measurement Input [2],[3] 0.67 0.29  
Measurement Input, Equity / Equity Index Volatility [Member] | Long-term debt [Member] | Recurring [Member] | Weighted Average [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Long-term Debt, Measurement Input [2],[3],[8] 0.23 0.16  
Measurement Input, Equity / Equity Index Volatility [Member] | Equity contracts [Member] | Recurring [Member] | Minimum [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [3] 0 0.07  
Measurement Input, Equity / Equity Index Volatility [Member] | Equity contracts [Member] | Recurring [Member] | Maximum [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [3] 0.67 0.36  
Measurement Input, Equity / Equity Index Volatility [Member] | Equity contracts [Member] | Recurring [Member] | Weighted Average [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [3],[8] 0.27 0.22  
Measurement Input, Equity/Equity and Equity/Index Correlation [Member] | Deposits [Member] | Recurring [Member] | Minimum [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Domestic Deposits, Measurement Input 0.43 0.43  
Measurement Input, Equity/Equity and Equity/Index Correlation [Member] | Deposits [Member] | Recurring [Member] | Maximum [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Domestic Deposits, Measurement Input 0.47 0.49  
Measurement Input, Equity/Equity and Equity/Index Correlation [Member] | Deposits [Member] | Recurring [Member] | Weighted Average [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Domestic Deposits, Measurement Input [8] 0.45 0.46  
Measurement Input, Equity/Equity and Equity/Index Correlation [Member] | Long-term debt [Member] | Recurring [Member] | Minimum [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Long-term Debt, Measurement Input [2],[3] 0.32 0.54  
Measurement Input, Equity/Equity and Equity/Index Correlation [Member] | Long-term debt [Member] | Recurring [Member] | Maximum [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Long-term Debt, Measurement Input [2],[3] 0.62 0.79  
Measurement Input, Equity/Equity and Equity/Index Correlation [Member] | Long-term debt [Member] | Recurring [Member] | Weighted Average [Member] | Valuation Technique, Option Adjusted Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Long-term Debt, Measurement Input [2],[3],[8] 0.52 0.64  
Measurement Input, Equity/Equity and Equity/Index Correlation [Member] | Equity contracts [Member] | Recurring [Member] | Minimum [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [3] 0.17 0.43  
Measurement Input, Equity/Equity and Equity/Index Correlation [Member] | Equity contracts [Member] | Recurring [Member] | Maximum [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [3] 0.62 0.79  
Measurement Input, Equity/Equity and Equity/Index Correlation [Member] | Equity contracts [Member] | Recurring [Member] | Weighted Average [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [3],[8] 0.30 0.49  
Measurement Input, Equity Dividend Yields and Forward Price [Member] | Equity contracts [Member] | Recurring [Member] | Minimum [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [3] (0.01) 0  
Measurement Input, Equity Dividend Yields and Forward Price [Member] | Equity contracts [Member] | Recurring [Member] | Maximum [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [3] 0 0.04  
Measurement Input, Equity Dividend Yields and Forward Price [Member] | Equity contracts [Member] | Recurring [Member] | Weighted Average [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input [3],[8] 0 0.02  
Measurement Input, Credit Default Swap Spreads [Member] | Credit contracts [Member] | Recurring [Member] | Valuation Technique, Option Pricing Model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input 0.0150 0.0041  
Measurement Input, Conversion Rate [Member] | Other Contracts [Member] | Recurring [Member] | Valuation Technique, Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Asset (Liability) Net, Measurement Input 1.6 1.6  
Measurement Input, Expected Duration [Member] | Other Contracts [Member] | Recurring [Member] | Valuation Technique, Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Derivative Contract, Duration, Measurement Input 2 years 3 years  
Measurement Input, Market Assumptions Related to Yields for Comparable Instruments [Member] | Other [Member] | Recurring [Member] | Valuation Technique, Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Debt Securities, Available-for-sale, Measurement Input 0.04    
Measurement Input, Market Assumptions Related to Yields for Comparable Instruments [Member] | Other [Member] | Recurring [Member] | Minimum [Member] | Valuation Technique, Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Debt Securities, Available-for-sale, Measurement Input   0  
Measurement Input, Market Assumptions Related to Yields for Comparable Instruments [Member] | Other [Member] | Recurring [Member] | Maximum [Member] | Valuation Technique, Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Debt Securities, Available-for-sale, Measurement Input   0.03  
Measurement Input, Market Assumptions Related to Yields for Comparable Instruments [Member] | Other [Member] | Recurring [Member] | Weighted Average [Member] | Valuation Technique, Discounted Cash Flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Debt Securities, Available-for-sale, Measurement Input [8]   0.02  
[1] Excluding unrealized gains (losses) on fair value option liabilities attributable to our own credit spread, which are recorded in other comprehensive income, gains (losses) on fair value option liabilities are included in gain (loss) on instruments designated at fair value and related derivatives in the consolidated statement of income (loss).
[2] Structured deposits and structured notes contain embedded derivative features whose fair value measurements contain significant Level 3 inputs. See equity and foreign exchange derivatives below for a discussion of the uncertainty of Level 3 inputs related to structured deposits and structured notes.
[3] We are the client-facing entity and we enter into identical but opposite derivatives to transfer the resultant risks to our affiliates. With the exception of counterparty credit risks, we are market neutral. The corresponding intra-group derivatives are presented as equity derivatives and foreign exchange derivatives in the table.
[4] Level 3 net derivatives included derivative assets of $692 million and derivative liabilities of $526 million at December 31, 2020 and derivative assets of $287 million and derivative liabilities of $222 million at December 31, 2019. Gains (losses) on derivatives, net are predominantly included in trading revenue and gain (loss) on instruments designated at fair value and related derivatives in the consolidated statement of income (loss).
[5] Gains (losses) on trading assets, excluding derivatives are included in trading revenue in the consolidated statement of income (loss).
[6] Realized gains (losses) on securities available-for-sale are included in other securities gains, net in the consolidated statement of income (loss). Changes in the allowance for credit losses on securities available-for-sale are included in the provision for credit losses in the consolidated statement of income (loss). Unrealized gains (losses) on securities available-for-sale are included in other comprehensive income.
[7] Represented contingent consideration receivable associated with the sale of certain private banking client relationships, which concluded in 2019. Gains (losses) associated with this transaction were included in other income in the consolidated statement of income (loss).
[8] For asset-backed securities available-for-sale, the value shown is the arithmetic average. For foreign exchange derivatives, equity derivatives, structured deposits and structured notes, weighted averages are calculated based on the fair value of the instruments. For all remaining instrument types, weighted averages are calculated based on the notional value of the instruments.