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Fair Value Measurement and Election - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Mar. 31, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Proceeds from sale of retained interest $ 20    
Gains recognized from redemptions of ARS1 23410 
LHFI at fair value452  452 492
Incremental charge-off536 7251,7142,355 
Loans sold at carrying value     479
Loans returned to LHFI   53111 
Structured Investment Vehicle | Collateralized Debt Obligations
      
Proceeds from sale of trading assets 21    
Asset-backed Securities | Auto Loans | Home Equity Lines Of Credit
      
Transferred Out of Level 3 in The Fair Value Hierarchy 31    
Asset-backed Securities | Trading Assets | Fair Value, Inputs, Level 2
      
Fair value measurement with unobservable inputs reconciliation recurring basis asset and liabilities level 3 transfers out of   32  
Asset-backed Securities | Available-for-Sale Securities | Fair Value, Inputs, Level 2
      
Fair value measurement with unobservable inputs reconciliation recurring basis asset and liabilities level 3 transfers out of   74  
Asset-backed Securities | Student Loans
      
Government guarantee97.00%  97.00%  
Equity Securities | Fair Value, Inputs, Level 2
      
Mutual funds net asset value$ 1  $ 1  
Equity Securities | Fair Value, Inputs, Level 3
      
Fair value of ARS recorded in trading equity securities7  7 123
Gains recognized from redemptions of ARS1  13  
FHLB stock and Federal Reserve Bank stock562  562  
Repurchase of stock by FHLB of Atlanta   127  
Equity Securities, Coca Cola | Fair Value, Inputs, Level 3
      
Derivative in a liability position, fair value146  146 145
Trading Account Assets | Fair Value, Inputs, Level 2
      
Trading loans were outstanding256  256 381
Residential Mortgage, Loans Held For Sale | Non Performing Loans
      
Transferred loans that were previously designated as held for investment to held for sale   47160 
Incremental charge-off   10  
Loans sold at carrying value34  34  
Loans returned to LHFI   13  
Residential Mortgage, Loans Held For Sale | Fair Value, Inputs, Level 2
      
Recognized losses due to changes in fair value attributable to borrower-specific credit risk4 41416 
Corporate and Other | Fair Value, Inputs, Level 3
      
Loans that were acquired through the acquisition of GB&T3  3  
Residential Mortgage Loans | Nonmarketable securities | Fair Value, Inputs, Level 3
      
Loans held for investment449  449  
Brokered Deposits | Fair Value, Inputs, Level 2
      
Recognized gains (losses) on liabilities due to changes in its own credit spread13 47140 
Long-Term Debt | Fair Value, Inputs, Level 2
      
Recognized gains (losses) on liabilities due to changes in its own credit spread57 694386 
Private Equity Funds | Other Assets | Fair Value, Inputs, Level 3
      
Impairment charge1 153 
Repossessed Personal Property | Other Assets | Fair Value, Inputs, Level 2
      
Impairment charge  118 
Lower Limit
      
Probable forecasted sale of Coke   6.5  
Upper Limit
      
Probable forecasted sale of Coke   7.0  
Collateralized Debt Obligations | Fair Value, Inputs, Level 2
      
Issued securities contained in a consolidated CLO at fair value in order to recognize the nonrecourse nature of these liabilities285  285  
Total Return Swap | Fair Value, Inputs, Level 2
      
LHFI at fair value1,400  1,400 972
Interest Rate Lock Commitments
      
Transferred Out of Level 3 in The Fair Value Hierarchy(95) 137(149)267 
Affordable Housing
      
Impairment charge    5 
Other Assets | Fair Value, Inputs, Level 3
      
Impairment charge    2 
Fair Value, Inputs, Level 2 | Personal Property Under Operating Leases
      
Impairment charge$ 2  $ 3$ 11