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Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Federal funds sold and securities purchased under agreements to resell $ 25,579 $ 17,838  
Securities held-to-maturity 10,224 13,293  
Loans, net of allowance for credit losses 65,325 67,916 $ 70,660
Loans held for sale 282 289  
Deposits 150,328 119,693 $ 119,801
Long-term debt 20,048 26,697  
Commercial Loans [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale 193 212  
Consumer Loans [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale 89 77  
Consumer Loans [Member] | Residential Mortgage [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale 89 77  
Level 1 [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Short-term financial assets, net of allowance for credit losses 1,352    
Short-term financial assets   1,744  
Federal funds sold and securities purchased under agreements to resell 0 0  
Securities held-to-maturity, net of allowance for credit losses 0    
Securities held-to-maturity   0  
Short-term financial liabilities 0 0  
Long-term debt 0 0  
Level 1 [Member] | Commercial Loans [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans, net of allowance for credit losses 0 0  
Loans held for sale 0 0  
Level 1 [Member] | Consumer Loans [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans, net of allowance for credit losses 0 0  
Level 1 [Member] | Consumer Loans [Member] | Residential Mortgage [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale 0 0  
Level 1 [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits 0 0  
Level 1 [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits 0 0  
Level 2 [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Short-term financial assets, net of allowance for credit losses 16,126    
Short-term financial assets   2,038  
Federal funds sold and securities purchased under agreements to resell 25,579 17,838  
Securities held-to-maturity, net of allowance for credit losses 10,644    
Securities held-to-maturity   13,431  
Short-term financial liabilities 5,515 3,286  
Long-term debt 10,607 16,696  
Level 2 [Member] | Commercial Loans [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans, net of allowance for credit losses 0 0  
Loans held for sale 152 34  
Level 2 [Member] | Consumer Loans [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans, net of allowance for credit losses 0 0  
Level 2 [Member] | Consumer Loans [Member] | Residential Mortgage [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale 92 77  
Level 2 [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits 135,941 96,161  
Level 2 [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits 9,673 16,264  
Level 3 [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Short-term financial assets, net of allowance for credit losses 14    
Short-term financial assets   18  
Federal funds sold and securities purchased under agreements to resell 0 0  
Securities held-to-maturity, net of allowance for credit losses 0    
Securities held-to-maturity   0  
Short-term financial liabilities 15 18  
Long-term debt 0 0  
Level 3 [Member] | Commercial Loans [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans, net of allowance for credit losses 45,011 49,252  
Loans held for sale 0 0  
Level 3 [Member] | Consumer Loans [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans, net of allowance for credit losses 19,917 19,889  
Level 3 [Member] | Consumer Loans [Member] | Residential Mortgage [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale 0 1  
Level 3 [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits 0 0  
Level 3 [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits 0 0  
Carrying Value [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Short-term financial assets, net of allowance for credit losses 17,492    
Short-term financial assets   3,800  
Federal funds sold and securities purchased under agreements to resell 25,579 17,838  
Securities held-to-maturity, net of allowance for credit losses 10,224    
Securities held-to-maturity   13,293  
Short-term financial liabilities 5,530 3,304  
Long-term debt 10,260 16,350  
Carrying Value [Member] | Commercial Loans [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans, net of allowance for credit losses 44,903 47,704  
Loans held for sale 152 34  
Carrying Value [Member] | Consumer Loans [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans, net of allowance for credit losses 20,388 20,212  
Carrying Value [Member] | Consumer Loans [Member] | Residential Mortgage [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale 89 77  
Carrying Value [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits 135,941 96,161  
Carrying Value [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits 9,664 16,323  
Estimate of fair value [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Short-term financial assets, net of allowance for credit losses 17,492    
Short-term financial assets   3,800  
Federal funds sold and securities purchased under agreements to resell 25,579 17,838  
Securities held-to-maturity, net of allowance for credit losses 10,644    
Securities held-to-maturity   13,431  
Short-term financial liabilities 5,530 3,304  
Long-term debt 10,607 16,696  
Estimate of fair value [Member] | Commercial Loans [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans, net of allowance for credit losses 45,011 49,252  
Loans held for sale 152 34  
Estimate of fair value [Member] | Consumer Loans [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans, net of allowance for credit losses 19,917 19,889  
Estimate of fair value [Member] | Consumer Loans [Member] | Residential Mortgage [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale 92 78  
Estimate of fair value [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits 135,941 96,161  
Estimate of fair value [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits $ 9,673 $ 16,264