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Fair Values of Assets and Liabilities - Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative liabilities netting $ (1,589) $ (2,312)    
Derivative assets netting (1,609) (1,874)    
Available-for-sale securities [1] 132,963 [2] 136,840    
Mortgage loans held for sale 6,623 8,524    
Mortgage servicing rights 2,953 2,210 $ 2,546 $ 2,791
Asset-Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 66 [3] 205    
Other [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 7 9    
Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative liabilities total 1,309 1,290    
Derivative assets total 2,278 4,127    
Available-for-sale securities 132,963 136,840    
Mortgage loans held for sale 6,623 8,524    
Mortgage servicing rights 2,953 2,210    
Other assets 2,199 1,903    
Total 147,016 153,604    
Short-term borrowings and other liabilities 2,046 1,757    
Total 3,355 3,047    
Fair Value, Measurements, Recurring [Member] | Netting and Collateral One [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative liabilities netting (1,589) (2,312)    
Derivative assets netting (1,609) (1,874)    
Total (1,609) (1,874)    
Total (1,589) (2,312)    
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and Agencies [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 36,609 22,391    
Fair Value, Measurements, Recurring [Member] | Obligations of State and Political Subdivisions [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 10,717 8,861    
Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 77,079 99,968    
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 8,485 5,406    
Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 66 205    
Fair Value, Measurements, Recurring [Member] | Other [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 7 9    
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative assets before netting 8 4    
Available-for-sale securities 30,917 19,251    
Other assets 278 302    
Total 31,203 19,557    
Short-term borrowings and other liabilities 209 85    
Total 209 85    
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and Agencies [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 30,917 19,251    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative liabilities before netting 2,308 3,166    
Derivative assets before netting 2,490 3,235    
Available-for-sale securities 102,038 117,581    
Mortgage loans held for sale 6,623 8,524    
Other assets 1,921 1,601    
Total 113,072 130,941    
Short-term borrowings and other liabilities 1,837 1,672    
Total 4,145 4,838    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | U.S. Treasury and Agencies [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 5,692 3,140    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of State and Political Subdivisions [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 10,716 8,860    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Residential Mortgage-Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 77,079 99,968    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 8,485 5,406    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 59 198    
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Other [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 7 9    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative liabilities before netting 590 436    
Derivative assets before netting 1,389 2,762    
Available-for-sale securities 8 8    
Mortgage servicing rights 2,953 2,210    
Total 4,350 4,980    
Total 590 436    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Obligations of State and Political Subdivisions [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 1 1    
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Asset-Backed Securities [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities $ 7 $ 7    
[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 available-for-sale investment securities was 3.4 years at December 31, 2020, with a corresponding weighted-average yield of 1.61 percent.
[3] Information related to asset and mortgage-backed securities included above is presented based upon weighted-average maturities that take into account anticipated future prepayments.