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Fair Value Measurements - Additional Information (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 assets $ 3,288 $ 3,301 $ 3,288 $ 3,301 $ 3,358 $ 3,328 $ 3,423 $ 3,504
Fair value of level 3 liabilities 1,917 2,499 $ 1,917 2,499 2,250 2,613 2,479 2,615
Loss severity, trust preferred securities     1.8          
Average deviation of implied volatility, foreign currency pair     4.00%          
Average deviation of implied volatility, at-the-money equity option     5.00%          
Fair Value Assets, Transfers Into Level 3 (1) 0 $ 0 0        
Fair Value Assets, Transfers Out of Level 3 (92) 2 (92) 2        
Fair Value Liability, Transfers Into Level 3 (39) (45) (54) (67)        
Fair Value Liability, Transfers Out of Level 3 124 72 $ 411 283        
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     52.00%          
Weighted Average [Member] | Impaired Loans [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair Value Inputs, Loss Severity     34.00%          
Derivative Assets [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 assets 335 304 $ 335 304        
Derivative Liabilities [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 liabilities [1] 122 228 122 228        
Credit contracts [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 assets [2] 207 171 207 171 188 179 179 210
Fair Value Assets, Transfers Into Level 3 [2] 0 0 0 0        
Fair Value Assets, Transfers Out of Level 3 [2] 0 0 0 0        
Mortgage servicing rights [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 assets [3] 0 130 0 130 104 140 158 159
Fair Value Assets, Transfers Into Level 3 [3] 0 0 0 0        
Fair Value Assets, Transfers Out of Level 3 [3] (95) 0 (95) 0        
Domestic Deposits [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 liabilities 1,404 1,754 [1] 1,404 1,754 [1] 1,677 1,867 1,817 [1] 1,968 [1]
Fair Value Liability, Transfers Into Level 3 [1] (39) (44) (54) (66)        
Fair Value Liability, Transfers Out of Level 3 57 54 [1] 198 233 [1]        
Borrowings [Member]                
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]                
Fair value of level 3 liabilities 513 745 [1] 513 745 [1] $ 573 746 $ 662 [1] $ 647 [1]
Fair Value Liability, Transfers Into Level 3 0 (1) [1] 0 (1) [1]        
Fair Value Liability, Transfers Out of Level 3 67 $ 18 [1] 213 $ 50 [1]        
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     $ 54    
[1] See Note 11, "Fair Value Option," for additional information.
[2] Level 3 net derivatives included derivative assets of $335 million and derivative liabilities of $122 million at September 30, 2016 and derivative assets of $304 million and derivative liabilities of $228 million at September 30, 2015.
[3] See Note 7, "Intangible Assets," and Note 9, "Other Assets Held for Sale," for additional information.