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Fair Value Measurements (Fair Value Measurements - Additional Information) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Net fair value of the interest rate lock commitments $ 11   $ 11    
Change in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 25 bp 6   6    
Change in the fair value of the interest rate lock commitments, due to decrease in current interest rates of 50 bp 11   11    
Change in the fair value of the interest rate lock commitments, due to increase in current interest rates of 25 bp 6   6    
Change in the fair value of the interest rate lock commitments, due to increase in current interest rates of 50 bp 12   12    
Change in fair value of interest rate lock commitments, due to 10% adverse changes in the assumed loan closing rates 1   1    
Change in fair value of interest rate lock commitments, due to 20% adverse changes in the assumed loan closing rates 2   2    
Change in fair value of interest rate lock commitments, due to 10% favorable changes in the assumed loan closing rates 1   1    
Change in fair value of interest rate lock commitments, due to 20% favorable changes in the assumed loan closing rates 2   2    
Portfolio loans to loans held for sale     171 $ 140  
Fair value changes included in earnings for instruments for which the fair value option was elected     18 26  
Net Losses On Operating Lease Equipment 1   3 20  
Larger commercial loans, subject to impairment review 1   1    
OTTI [1] 0 $ (14) 0 (24)  
Commercial Loans Held For Sale          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Portfolio loans to loans held for sale   57 1 75  
Net impact related to fair value adjustments   (13)   (30)  
Gain Loss On Sales Of Loans Net       (2)  
Fair value adjustment on existing loans     1    
Other Real Estate Owned          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Net impact related to fair value adjustments     2 2  
Nonrecurring Losses Included As Charge-Offs 1 $ 1 2 $ 3  
Residential Mortgage Loans          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Fair value of loans     1   $ 2
Fair value measurements nonrecurring | Private Equity Investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
OTTI 4   10    
Positive fair value adjustment, observable price changes | Private Equity Investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Fair value adjustment 16   51    
Cumulative Fair Value Adjustment Related to Assets Held at End of Period     35    
Fair value adjustment, impairment | Private Equity Investments          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis          
Fair value adjustment $ 1   11    
Cumulative Fair Value Adjustment Related to Assets Held at End of Period     $ 11    
[1]

Included in securities (losses) gains, net in the Condensed Consolidated Statements of Income.