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Fair Value Measurements - Quantitative Information about Recurring Fair Value Measurement of Assets and Liabilities Classified as Level 3 (Detail)
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 3,356,000,000 $ 3,328,000,000 $ 3,504,000,000
Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Assets, Fair Value Disclosure, Recurring 3,564,000,000 3,577,000,000  
Liabilities, Fair Value Disclosure, Recurring (2,114,000,000) (2,862,000,000)  
Collateralized debt obligations [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 184,000,000 221,000,000 253,000,000
Collateralized debt obligations [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Assets, Fair Value Disclosure, Recurring $ 184,000,000 $ 221,000,000  
Collateralized debt obligations [Member] | Recurring [Member] | Minimum [Member] | Broker quotes or consensus pricing and, where applicable, discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Prepayment Rate 1.00% 1.00%  
Fair Value Inputs, Probability of Default 6.00% 3.00%  
Fair Value Inputs, Loss Severity   90.00%  
Collateralized debt obligations [Member] | Recurring [Member] | Maximum [Member] | Broker quotes or consensus pricing and, where applicable, discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Prepayment Rate 6.00% 6.00%  
Fair Value Inputs, Probability of Default 8.00% 7.00%  
Fair Value Inputs, Loss Severity   99.00%  
Collateralized debt obligations [Member] | Recurring [Member] | Weighted Average [Member] | Broker quotes or consensus pricing and, where applicable, discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Loss Severity 85.00%    
Corporate and other domestic debt securities [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 2,884,000,000 $ 2,870,000,000 2,840,000,000
Corporate and other domestic debt securities [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Assets, Fair Value Disclosure, Recurring $ 2,884,000,000 $ 2,870,000,000  
Corporate and other domestic debt securities [Member] | Recurring [Member] | Minimum [Member] | Discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Spread Volatility on Collateral Assets 3.00% 2.00%  
Corporate and other domestic debt securities [Member] | Recurring [Member] | Maximum [Member] | Discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Spread Volatility on Collateral Assets 4.00% 4.00%  
Corporate and other domestic debt securities [Member] | Recurring [Member] | Weighted Average [Member] | Discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Correlation Between Insurance Claim Shortfall and Collateral Value 80.00% 80.00%  
Credit contracts [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value [1] $ 193,000,000 $ 179,000,000 210,000,000
Credit contracts [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Assets, Fair Value Disclosure, Recurring $ 193,000,000 $ 179,000,000  
Credit contracts [Member] | Recurring [Member] | Minimum [Member] | Option pricing model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Correlation of Defaults of Portfolio of Reference Credit Names   44.00%  
Fair Value Inputs, Issuer by Issuer Correlation of Defaults 82.00% 82.00%  
Fair Value Inputs, Credit Default Swap Spreads 1.50%    
Credit contracts [Member] | Recurring [Member] | Maximum [Member] | Option pricing model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Correlation of Defaults of Portfolio of Reference Credit Names   47.00%  
Fair Value Inputs, Issuer by Issuer Correlation of Defaults 83.00% 83.00%  
Fair Value Inputs, Credit Default Swap Spreads 1.73%    
Equity contracts [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value [1] $ (2,000,000) $ (83,000,000) 42,000,000
Equity contracts [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Assets, Fair Value Disclosure, Recurring $ (2,000,000) [2] $ (83,000,000)  
Equity contracts [Member] | Recurring [Member] | Minimum [Member] | Option pricing model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Equity/Equity Index Volatility [2] 11.00% 14.00%  
Fair Value Inputs, Equity/Equity and Equity/Index Correlation [2] 45.00% 48.00%  
Fair Value Inputs, Equity Dividend Yields [2] 0.00% 0.00%  
Equity contracts [Member] | Recurring [Member] | Maximum [Member] | Option pricing model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Equity/Equity Index Volatility [2] 49.00% 72.00%  
Fair Value Inputs, Equity/Equity and Equity/Index Correlation [2] 57.00% 59.00%  
Fair Value Inputs, Equity Dividend Yields [2] 14.00% 18.00%  
Foreign exchange contracts [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value [1] $ 0 $ 0 0
Foreign exchange contracts [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Assets, Fair Value Disclosure, Recurring [2] $ 0 $ 0  
Foreign exchange contracts [Member] | Recurring [Member] | Minimum [Member] | Option pricing model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Implied Volatility Currency Pairs [2] 15.00% 18.00%  
Foreign exchange contracts [Member] | Recurring [Member] | Maximum [Member] | Option pricing model [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Implied Volatility Currency Pairs [2] 21.00% 22.00%  
Interest rate contracts [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value [1] $ 1,000,000 $ 1,000,000 0
Interest rate contracts [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Assets, Fair Value Disclosure, Recurring $ 1,000,000 $ 1,000,000  
Interest rate contracts [Member] | Recurring [Member] | Minimum [Member] | Market comparable adjusted for probability to fund [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Probability to Fund for Rate Lock Commitments 38.00% 18.00%  
Interest rate contracts [Member] | Recurring [Member] | Maximum [Member] | Market comparable adjusted for probability to fund [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Probability to Fund for Rate Lock Commitments 100.00% 100.00%  
Other Contract [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ (9,000,000) $ 0 [1],[3]  
Other Contract [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Assets, Fair Value Disclosure, Recurring $ (9,000,000)    
Other Contract [Member] | Recurring [Member] | Discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Conversion Rate 1.6    
Other Contract [Member] | Recurring [Member] | Minimum [Member] | Discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Expected Duration 3 years    
Other Contract [Member] | Recurring [Member] | Maximum [Member] | Discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Expected Duration 5 years    
Other asset-backed securities available-for-sale [Member] | Recurring [Member] | Minimum [Member] | Discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Comparability Adjustments 1.00%    
Other asset-backed securities available-for-sale [Member] | Recurring [Member] | Maximum [Member] | Discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Comparability Adjustments 4.00%    
Mortgage servicing rights [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 0 140,000,000 [4] $ 159,000,000 [4]
Mortgage servicing rights [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Assets, Fair Value Disclosure, Recurring   $ 140,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value [4] 0    
Mortgage servicing rights [Member] | Recurring [Member] | Minimum [Member] | Option adjusted discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Prepayment Rate   11.00%  
Fair Value Inputs, Option Adjusted Spread   8.00%  
Fair Value Inputs, Estimated Annualized Costs to Service   $ 87  
Mortgage servicing rights [Member] | Recurring [Member] | Maximum [Member] | Option adjusted discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Prepayment Rate   50.00%  
Fair Value Inputs, Option Adjusted Spread   14.00%  
Fair Value Inputs, Estimated Annualized Costs to Service   $ 329  
Domestic Deposits [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Liabilities, Fair Value Disclosure, Recurring [2],[5] $ (1,407,000,000) $ (1,867,000,000)  
Domestic Deposits [Member] | Recurring [Member] | Minimum [Member] | Option adjusted discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Implied Volatility Currency Pairs [2],[5] 15.00% 18.00%  
Fair Value Inputs, Equity/Equity Index Volatility [2],[5] 11.00% 14.00%  
Fair Value Inputs, Equity/Equity and Equity/Index Correlation 45.00% 48.00%  
Domestic Deposits [Member] | Recurring [Member] | Maximum [Member] | Option adjusted discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Implied Volatility Currency Pairs [2],[5] 21.00% 22.00%  
Fair Value Inputs, Equity/Equity Index Volatility [2],[5] 49.00% 72.00%  
Fair Value Inputs, Equity/Equity and Equity/Index Correlation 57.00% 59.00%  
Long-term debt [Member] | Level 3 [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Liabilities, Fair Value Disclosure, Recurring [2],[5] $ (499,000,000) $ (746,000,000)  
Long-term debt [Member] | Recurring [Member] | Minimum [Member] | Option adjusted discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Implied Volatility Currency Pairs [2],[5] 15.00% 18.00%  
Fair Value Inputs, Equity/Equity Index Volatility [2],[5] 11.00% 14.00%  
Fair Value Inputs, Equity/Equity and Equity/Index Correlation [2],[5] 45.00% 48.00%  
Long-term debt [Member] | Recurring [Member] | Maximum [Member] | Option adjusted discounted cash flows [Member]      
Fair Value Measurements, Recurring, Valuation Techniques [Line Items]      
Fair Value Inputs, Implied Volatility Currency Pairs [2],[5] 21.00% 22.00%  
Fair Value Inputs, Equity/Equity Index Volatility [2],[5] 49.00% 72.00%  
Fair Value Inputs, Equity/Equity and Equity/Index Correlation [2],[5] 57.00% 59.00%  
[1] Level 3 net derivatives included derivative assets of $391 million and derivative liabilities of $208 million at December 31, 2016 and derivative assets of $346 million and derivative liabilities of $249 million at December 31, 2015.
[2] 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.
[3] Consists of swap agreements entered into in conjunction with the sale of certain Visa Class B Shares.
[4] See Note 9, "Intangible Assets," for additional information.
[5] Structured deposits and structured notes contain embedded derivative features whose fair value measurements contain significant Level 3 inputs.