XML 17 R70.htm IDEA: XBRL DOCUMENT v2.4.0.8
Fair Value Measurements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Weighted average discount margin over LIBOR 7.00%    
Securities issued by financial institutions and other entities backed by trust preferred securities at cost $ 38   $ 42
Fair value of securities issued by financial institutions and other entities backed by trust preferred securities 62   63
Loans measured at fair value on nonrecurring basis 161 227 222
Change in fair value of nonrecurring fair value measured loans for charge-offs and impairment reserves 15 15  
Assets taken in foreclosure of defaulted loans measured at fair value on a nonrecurring basis 11 19  
Significant Observable Inputs (Level 2) [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans measured at fair value on nonrecurring basis 100 158 173
Significant Unobservable Inputs (Level 3) [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans measured at fair value on nonrecurring basis $ 61 $ 69 $ 49
Minimum [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount margin over LIBOR 4.00%    
Discount rates for fair value estimations 20.00%    
Maximum [Member]
     
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Discount margin over LIBOR 11.00%    
Discount rates for fair value estimations 75.00%