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Fair Value Measurements - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Loss severity, trust preferred securities     0.85          
Average deviation of implied volatility, foreign currency pair     3.00%          
Average deviation of implied volatility, at-the-money equity option     5.00%          
Revaluation period     45 days          
Weighted Average [Member] | Residential mortgages and home equity mortgages [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair Value Inputs, Loss Severity     40.00%          
Weighted Average [Member] | Impaired Loans [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair Value Inputs, Loss Severity     37.00%          
Derivative Assets [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 assets $ 301 $ 397 $ 301 $ 397        
Derivative Liabilities [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 liabilities [1] 170 223 170 223        
Other liabilities [Member] | Standby Letters of Credit [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Deferred fees on standby letters of credit 49   49     $ 49    
Level 3 [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 assets 2,172 3,358 2,172 3,358 $ 3,351 3,356 $ 3,323 $ 3,328
Fair value of level 3 liabilities 1,683 2,250 1,683 2,250 1,774 1,906 2,495 2,613
Fair Value Liability, Transfers Into Level 3 (18) (7) (23) (15)        
Fair Value Liability, Transfers Out of Level 3 63 143 152 286        
Level 3 [Member] | Domestic Deposits [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 liabilities 1,142 1,677 [1] 1,142 1,677 [1] 1,216 1,407 1,849 [1] 1,867 [1]
Fair Value Liability, Transfers Into Level 3 [1] (18) (7) (21) (15)        
Fair Value Liability, Transfers Out of Level 3 56 82 [1] 102 141 [1]        
Level 3 [Member] | Borrowings [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 liabilities 541 573 [1] 541 573 [1] $ 558 $ 499 $ 646 [1] $ 746 [1]
Fair Value Liability, Transfers Into Level 3 0 0 [1] (2) 0 [1]        
Fair Value Liability, Transfers Out of Level 3 $ 7 $ 61 [1] $ 50 $ 145 [1]        
[1] See Note 9, "Fair Value Option," for additional information. Beginning January 1, 2017, unrealized gains (losses) on fair value option liabilities attributable to credit spread is recorded in other comprehensive income.