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Guarantees and Contingent Liabilities - Contract or Notional Amounts of Unfunded Commitments to Extend Credit (Detail)
$ in Millions
Dec. 31, 2016
USD ($)
Commercial and Commercial Real Estate Loans [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit $ 124,923
Corporate and Purchasing Card Loans [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 25,085
Residential Mortgages [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 391
Credit Card [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 101,258
Other Retail Loans [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 35,806
Covered Loans [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 320
Other [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 5,576
Less Than One Year [Member] | Commercial and Commercial Real Estate Loans [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 26,471
Less Than One Year [Member] | Corporate and Purchasing Card Loans [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 25,085
Less Than One Year [Member] | Residential Mortgages [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 379
Less Than One Year [Member] | Credit Card [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 101,258
Less Than One Year [Member] | Other Retail Loans [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 13,254
Less Than One Year [Member] | Other [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 5,558
Greater Than One Year [Member] | Commercial and Commercial Real Estate Loans [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 98,452
Greater Than One Year [Member] | Residential Mortgages [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 12
Greater Than One Year [Member] | Other Retail Loans [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 22,552
Greater Than One Year [Member] | Covered Loans [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit 320
Greater Than One Year [Member] | Other [Member]  
Other Commitments [Line Items]  
Contract or notional amounts of unfunded commitments to extend credit $ 18