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Changes in level 3 assets and liabilities measured at fair value on a recurring basis (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Assets Fair Value Disclosure Abstract    
Beginning Balance $ 187 $ 201
Gains (Losses) included in earnings/ OCI 2 (6)
Purchases 7 9
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales (4) (1)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements 0 0
Transfers into Level 3 2  
Transfers out of Level 3 (8)  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net   0
Ending Balance 186 203
Changes in unrealized gains (losses) relating to assets still held at reporting date 7 (2)
Liabilities Fair Value Disclosure Abstract    
Beginning Balance (100) [1] (93) [1]
Gains (Losses) included in earnings/ OCI (1) [1] (1) [1]
Ending Balance (101) [1] (94) [1]
Changes in unrealized gains (losses) relating to liabilities still held at reporting date (1) [1] (1) [1]
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Contingent Liability [Member]
   
Liabilities Fair Value Disclosure Abstract    
Beginning Balance (100)  
Gains (Losses) included in earnings/ OCI (1)  
Ending Balance (101)  
Changes in unrealized gains (losses) relating to liabilities still held at reporting date (1)  
Availableforsale Securities Member
   
Assets Fair Value Disclosure Abstract    
Beginning Balance 7 [2] 8 [2]
Gains (Losses) included in earnings/ OCI 0 [2] 0 [2]
Purchases 0 [2] 0 [2]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales 0 [2] 0 [2]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements 0 [2] 0 [2]
Transfers into Level 3 0 [2]  
Transfers out of Level 3 0 [2]  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net   0 [2]
Ending Balance 7 [2] 8 [2]
Changes in unrealized gains (losses) relating to assets still held at reporting date 0 [2] 0 [2]
Availableforsale Securities Member | Collateralized Mortgage Backed Securities [Member]
   
Assets Fair Value Disclosure Abstract    
Beginning Balance 7 8
Gains (Losses) included in earnings/ OCI 0 0
Purchases 0 0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales 0 0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements 0 0
Transfers into Level 3 0  
Transfers out of Level 3 0  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net   0
Ending Balance 7 8
Changes in unrealized gains (losses) relating to assets still held at reporting date 0 0
Trading Account Assets[Member]
   
Assets Fair Value Disclosure Abstract    
Beginning Balance 29 [3] 26 [3]
Gains (Losses) included in earnings/ OCI 1 [3] 0 [3]
Purchases 3 [3] 2 [3]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales (4) [3] (1) [3]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements 0 [3] 0 [3]
Transfers into Level 3 2 [3]  
Transfers out of Level 3 (8) [3]  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net   0 [3]
Ending Balance 23 [3] 27 [3]
Changes in unrealized gains (losses) relating to assets still held at reporting date 1 [3] 0 [3]
Trading Account Assets[Member] | Collateralized Mortgage Backed Securities [Member]
   
Assets Fair Value Disclosure Abstract    
Beginning Balance 22 20
Gains (Losses) included in earnings/ OCI 1 0
Purchases 3 2
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales (4) (1)
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements 0 0
Transfers into Level 3 2  
Transfers out of Level 3 (8)  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net   0
Ending Balance 16 21
Changes in unrealized gains (losses) relating to assets still held at reporting date 1 0
Trading Account Assets[Member] | Collateralized Mortgage Obligations Member
   
Assets Fair Value Disclosure Abstract    
Beginning Balance 3 3
Gains (Losses) included in earnings/ OCI 0 0
Purchases 0 0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales 0 0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements 0 0
Transfers into Level 3 0  
Transfers out of Level 3 0  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net   0
Ending Balance 3 3
Changes in unrealized gains (losses) relating to assets still held at reporting date 0 0
Trading Account Assets[Member] | Other
   
Assets Fair Value Disclosure Abstract    
Beginning Balance 4 3
Gains (Losses) included in earnings/ OCI 0 0
Purchases 0 0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales 0 0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements 0 0
Transfers into Level 3 0  
Transfers out of Level 3 0  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net   0
Ending Balance 4 3
Changes in unrealized gains (losses) relating to assets still held at reporting date 0 0
Servicing Asset At Fair Value Amount [Member]
   
Assets Fair Value Disclosure Abstract    
Beginning Balance 151 [4] 167 [4]
Gains (Losses) included in earnings/ OCI 1 [4] (6) [4]
Purchases 4 [4] 7 [4]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Sales 0 [4] 0 [4]
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Settlements 0 [4] 0 [4]
Transfers into Level 3 0 [4]  
Transfers out of Level 3 0 [4]  
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Net   0 [4]
Ending Balance 156 [4] 168 [4]
Changes in unrealized gains (losses) relating to assets still held at reporting date $ 6 [4] $ (2) [4]
[1] Gains (losses) are included in “FDIC loss share (expense) income” in the consolidated statement of operations.
[2] Gains (losses) are included in OCI.
[3] Gains (losses) are included in “Trading account profit” in the consolidated statement of operations.
[4] Gains (losses) are included in “Other services fees” in the consolidated statement of operations.