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Fair Value Measurements - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Federal funds sold and securities purchased under agreements to resell $ 17,838 $ 10,168  
Securities held-to-maturity 13,293 14,670  
Loans, net of allowance for credit losses 67,916 68,437 $ 71,882
Loans held for sale 289 512  
Deposits 119,693 110,955 $ 118,702
Deposits held for sale 0 10  
Long-term debt 26,697 30,628  
Commercial Loans [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale 212 394  
Consumer Loans [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale 77 118  
Consumer Loans [Member] | Residential Mortgage [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale 77 65  
Consumer Loans [Member] | Other consumer [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale 0 53  
Level 1 [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Short-term financial assets 1,744 1,514  
Federal funds sold and securities purchased under agreements to resell 0 0  
Securities held-to-maturity 0 0  
Short-term financial liabilities 0 0  
Deposits held for sale   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] | Consumer Loans [Member] | Other consumer [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale   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 2,038 15,700  
Federal funds sold and securities purchased under agreements to resell 17,838 10,168  
Securities held-to-maturity 13,431 14,443  
Short-term financial liabilities 3,286 3,626  
Deposits held for sale   10  
Long-term debt 16,696 19,688  
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 34 285  
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 77 65  
Level 2 [Member] | Consumer Loans [Member] | Other consumer [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale   0  
Level 2 [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits 96,161 91,794  
Level 2 [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits 16,264 10,933  
Level 3 [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Short-term financial assets 18 23  
Federal funds sold and securities purchased under agreements to resell 0 0  
Securities held-to-maturity 0 0  
Short-term financial liabilities 18 23  
Deposits held for sale   0  
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 49,252 50,671  
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 19,889 18,878  
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 1 0  
Level 3 [Member] | Consumer Loans [Member] | Other consumer [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale   53  
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 3,800 17,237  
Federal funds sold and securities purchased under agreements to resell 17,838 10,168  
Securities held-to-maturity 13,293 14,670  
Short-term financial liabilities 3,304 3,643  
Deposits held for sale   10  
Long-term debt 16,350 19,379  
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 47,704 48,884  
Loans held for sale 34 285  
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 20,212 19,553  
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 77 65  
Carrying Value [Member] | Consumer Loans [Member] | Other consumer [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale   53  
Carrying Value [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits 96,161 91,794  
Carrying Value [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits 16,323 10,996  
Estimate of fair value [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Short-term financial assets 3,800 17,237  
Federal funds sold and securities purchased under agreements to resell 17,838 10,168  
Securities held-to-maturity 13,431 14,443  
Short-term financial liabilities 3,304 3,649  
Deposits held for sale   10  
Long-term debt 16,696 19,688  
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 49,252 50,671  
Loans held for sale 34 285  
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 19,889 18,878  
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 78 65  
Estimate of fair value [Member] | Consumer Loans [Member] | Other consumer [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Loans held for sale   53  
Estimate of fair value [Member] | Deposits Without Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits 96,161 91,794  
Estimate of fair value [Member] | Deposits With Fixed Maturities [Member]      
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]      
Deposits $ 16,264 $ 10,933