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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Assets:      
Available-for-sale debt securities, fair value $ 38,645 $ 36,028  
Trading debt securities 433 297  
Equity securities 459 564  
Total assets 480   $ 173
Commercial      
Assets:      
Commercial loans held for sale measured at FV 8 0  
Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 38,029 35,472  
Trading debt securities 433 297  
Equity securities 459 564  
Residential mortgage loans held for sale 1,565 1,264  
Commercial loans held for sale measured at FV 8    
Derivative assets 4,100 1,673  
Total assets 45,464 40,446  
Liabilities:      
Derivative liabilities 1,866 741  
Short positions 230 149  
Total liabilities 2,096 890  
Fair value, recurring | Residential Mortgage Loans      
Assets:      
Loans measured at FV 185 183  
Fair value, recurring | Mortgage Servicing Rights      
Assets:      
Mortgage Servicing Rights 685 993  
Interest Rate Contract | Fair value, recurring      
Assets:      
Derivative assets 2,739 1,237  
Liabilities:      
Derivative liabilities 384 157  
Foreign Exchange Contract | Fair value, recurring      
Assets:      
Derivative assets 345 165  
Liabilities:      
Derivative liabilities 291 151  
Equity Contract | Fair value, recurring      
Liabilities:      
Derivative liabilities 171 163  
Commodity Contract | Fair value, recurring      
Assets:      
Derivative assets 1,016 271  
Liabilities:      
Derivative liabilities 1,020 270  
U.S. Treasury and Federal Agency Securities      
Assets:      
Available-for-sale debt securities, fair value 78 75  
U.S. Treasury and Federal Agency Securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 78 75  
Trading debt securities 50 2  
Liabilities:      
Short positions 75 49  
Obligations of states and political subdivisions      
Assets:      
Available-for-sale debt securities, fair value 17 18  
Obligations of states and political subdivisions | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 17 18  
Trading debt securities 28 9  
Agency mortgage-backed securities | Fair value, recurring | Commercial      
Assets:      
Available-for-sale debt securities, fair value 17,798 15,693  
Agency mortgage-backed securities | Fair value, recurring | Residential Mortgage Loans      
Assets:      
Available-for-sale debt securities, fair value 14,144 14,115  
Trading debt securities 55 55  
Liabilities:      
Short positions 3    
Non-agency mortgage-backed securities | Fair value, recurring | Commercial      
Assets:      
Available-for-sale debt securities, fair value 3,315 3,365  
Non-Agency Residential Mortgage-Backed Securities | Fair value, recurring      
Assets:      
Trading debt securities 4    
Asset-backed securities and other debt securities      
Assets:      
Available-for-sale debt securities, fair value 2,677 2,206  
Asset-backed securities and other debt securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 2,677 2,206  
Trading debt securities 296 231  
Liabilities:      
Short positions 152 100  
Fair Value, Inputs, Level 1      
Assets:      
Total assets 0   0
Fair Value, Inputs, Level 1 | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 78 75  
Trading debt securities 49 2  
Equity securities 450 554  
Residential mortgage loans held for sale 0 0  
Commercial loans held for sale measured at FV 0    
Derivative assets 294 38  
Total assets 871 669  
Liabilities:      
Derivative liabilities 111 22  
Short positions 75 49  
Total liabilities 186 71  
Fair Value, Inputs, Level 1 | Fair value, recurring | Residential Mortgage Loans      
Assets:      
Loans measured at FV 0 0  
Fair Value, Inputs, Level 1 | Fair value, recurring | Mortgage Servicing Rights      
Assets:      
Mortgage Servicing Rights 0 0  
Fair Value, Inputs, Level 1 | Interest Rate Contract | Fair value, recurring      
Assets:      
Derivative assets 11 1  
Liabilities:      
Derivative liabilities 72 5  
Fair Value, Inputs, Level 1 | Foreign Exchange Contract | Fair value, recurring      
Assets:      
Derivative assets 0 0  
Liabilities:      
Derivative liabilities 0 0  
Fair Value, Inputs, Level 1 | Equity Contract | Fair value, recurring      
Liabilities:      
Derivative liabilities 0 0  
Fair Value, Inputs, Level 1 | Commodity Contract | Fair value, recurring      
Assets:      
Derivative assets 283 37  
Liabilities:      
Derivative liabilities 39 17  
Fair Value, Inputs, Level 1 | U.S. Treasury and Federal Agency Securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 78 75  
Trading debt securities 49 2  
Liabilities:      
Short positions 75 49  
Fair Value, Inputs, Level 1 | Obligations of states and political subdivisions | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Fair Value, Inputs, Level 1 | Agency mortgage-backed securities | Fair value, recurring | Commercial      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Fair Value, Inputs, Level 1 | Agency mortgage-backed securities | Fair value, recurring | Residential Mortgage Loans      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Liabilities:      
Short positions 0    
Fair Value, Inputs, Level 1 | Non-agency mortgage-backed securities | Fair value, recurring | Commercial      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Fair Value, Inputs, Level 1 | Non-Agency Residential Mortgage-Backed Securities | Fair value, recurring      
Assets:      
Trading debt securities 0    
Fair Value, Inputs, Level 1 | Asset-backed securities and other debt securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Liabilities:      
Short positions 0 0  
Fair Value, Inputs, Level 2      
Assets:      
Total assets 41   1
Fair Value, Inputs, Level 2 | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 37,951 35,397  
Trading debt securities 384 295  
Equity securities 9 10  
Residential mortgage loans held for sale 1,565 1,264  
Commercial loans held for sale measured at FV 8    
Derivative assets 3,737 1,617  
Total assets 43,654 38,583  
Liabilities:      
Derivative liabilities 1,576 548  
Short positions 155 100  
Total liabilities 1,731 648  
Fair Value, Inputs, Level 2 | Fair value, recurring | Residential Mortgage Loans      
Assets:      
Loans measured at FV 0 0  
Fair Value, Inputs, Level 2 | Fair value, recurring | Mortgage Servicing Rights      
Assets:      
Mortgage Servicing Rights 0 0  
Fair Value, Inputs, Level 2 | Interest Rate Contract | Fair value, recurring      
Assets:      
Derivative assets 2,659 1,218  
Liabilities:      
Derivative liabilities 304 144  
Fair Value, Inputs, Level 2 | Foreign Exchange Contract | Fair value, recurring      
Assets:      
Derivative assets 345 165  
Liabilities:      
Derivative liabilities 291 151  
Fair Value, Inputs, Level 2 | Equity Contract | Fair value, recurring      
Liabilities:      
Derivative liabilities 0 0  
Fair Value, Inputs, Level 2 | Commodity Contract | Fair value, recurring      
Assets:      
Derivative assets 733 234  
Liabilities:      
Derivative liabilities 981 253  
Fair Value, Inputs, Level 2 | U.S. Treasury and Federal Agency Securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 1 0  
Liabilities:      
Short positions 0 0  
Fair Value, Inputs, Level 2 | Obligations of states and political subdivisions | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 17 18  
Trading debt securities 28 9  
Fair Value, Inputs, Level 2 | Agency mortgage-backed securities | Fair value, recurring | Commercial      
Assets:      
Available-for-sale debt securities, fair value 17,798 15,693  
Fair Value, Inputs, Level 2 | Agency mortgage-backed securities | Fair value, recurring | Residential Mortgage Loans      
Assets:      
Available-for-sale debt securities, fair value 14,144 14,115  
Trading debt securities 55 55  
Liabilities:      
Short positions 3    
Fair Value, Inputs, Level 2 | Non-agency mortgage-backed securities | Fair value, recurring | Commercial      
Assets:      
Available-for-sale debt securities, fair value 3,315 3,365  
Fair Value, Inputs, Level 2 | Non-Agency Residential Mortgage-Backed Securities | Fair value, recurring      
Assets:      
Trading debt securities 4    
Fair Value, Inputs, Level 2 | Asset-backed securities and other debt securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 2,677 2,206  
Trading debt securities 296 231  
Liabilities:      
Short positions 152 100  
Fair Value, Inputs, Level 3      
Assets:      
Total assets 439   $ 172
Fair Value, Inputs, Level 3 | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Equity securities 0 0  
Residential mortgage loans held for sale 0 0  
Commercial loans held for sale measured at FV 0    
Derivative assets 69 18  
Total assets 939 1,194  
Liabilities:      
Derivative liabilities 179 171  
Short positions 0 0  
Total liabilities 179 171  
Fair Value, Inputs, Level 3 | Fair value, recurring | Residential Mortgage Loans      
Assets:      
Loans measured at FV 185 183  
Fair Value, Inputs, Level 3 | Fair value, recurring | Mortgage Servicing Rights      
Assets:      
Mortgage Servicing Rights 685 993  
Fair Value, Inputs, Level 3 | Interest Rate Contract | Fair value, recurring      
Assets:      
Derivative assets 69 18  
Liabilities:      
Derivative liabilities 8 8  
Fair Value, Inputs, Level 3 | Foreign Exchange Contract | Fair value, recurring      
Assets:      
Derivative assets 0 0  
Liabilities:      
Derivative liabilities 0 0  
Fair Value, Inputs, Level 3 | Equity Contract | Fair value, recurring      
Liabilities:      
Derivative liabilities 171 163  
Fair Value, Inputs, Level 3 | Commodity Contract | Fair value, recurring      
Assets:      
Derivative assets 0 0  
Liabilities:      
Derivative liabilities 0 0  
Fair Value, Inputs, Level 3 | U.S. Treasury and Federal Agency Securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Liabilities:      
Short positions 0 0  
Fair Value, Inputs, Level 3 | Obligations of states and political subdivisions | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Fair Value, Inputs, Level 3 | Agency mortgage-backed securities | Fair value, recurring | Commercial      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Fair Value, Inputs, Level 3 | Agency mortgage-backed securities | Fair value, recurring | Residential Mortgage Loans      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Liabilities:      
Short positions 0    
Fair Value, Inputs, Level 3 | Non-agency mortgage-backed securities | Fair value, recurring | Commercial      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Fair Value, Inputs, Level 3 | Non-Agency Residential Mortgage-Backed Securities | Fair value, recurring      
Assets:      
Trading debt securities 0    
Fair Value, Inputs, Level 3 | Asset-backed securities and other debt securities | Fair value, recurring      
Assets:      
Available-for-sale debt securities, fair value 0 0  
Trading debt securities 0 0  
Liabilities:      
Short positions $ 0 $ 0