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Fair Value Of Financial Instruments (Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets $ 4,467 $ 1,628
Realized Gains / (Losses), Assets (11) (19)
Unrealized Gains / (Losses) Included in Earnings, Assets 316 205
Unrealized Gains / (Losses) Included in OCI, Assets (6) 198
Foreign Exchange Recognized in OCI or Earnings, Assets 5 19
Purchases, Assets 167  
Issuances, Assets 15  
Settlements, Assets (639)  
Sales, Assets (182)  
Purchases, Issuances and Settlements, net, Assets   2,608
Transfers into Level 3, Assets 447 [1] 390 [2]
Transfers out of Level 3, Assets (391) [1] (562) [2]
Ending Balance, Fair Value Assets 4,188 4,467
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets 364 151
Beginning Balance, Fair Value Liabilities 9,916 3,900
Realized Gains / (Losses), Liabilities 2,477 274
Unrealized Gains / (Losses) Included in Earnings, Liabilities 605 1,177
Foreign Exchange Recognized in OCI or Earnings, Liabilities (4) 34
Purchases, Liabilities (8)  
Settlements, Liabilities (3,056)  
Sales, Liabilities (2,001)  
Purchases, Issuances and Settlements, net, Liabilities   4,531
Transfers into Level 3, Liabilities 9 [1] 390
Transfers out of Level 3, Liabilities 391 562
Ending Balance, Fair Value Liabilities 7,938 9,916
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities 2,809 1,900
U.S. Treasury And Government Agency [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets   6
Purchases, Issuances and Settlements, net, Assets   21
Transfers out of Level 3, Assets   (27) [2]
Foreign Governments [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 11 12
Foreign Exchange Recognized in OCI or Earnings, Assets (7) 1
Purchases, Assets 13  
Settlements, Assets (5)  
Sales, Assets (1)  
Purchases, Issuances and Settlements, net, Assets   5
Transfers into Level 3, Assets 7 [1]  
Transfers out of Level 3, Assets (7) [1] (7) [2]
Ending Balance, Fair Value Assets 11 11
Corporate Obligations [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 246 358
Realized Gains / (Losses), Assets (4) (1)
Unrealized Gains / (Losses) Included in OCI, Assets (8) 54
Foreign Exchange Recognized in OCI or Earnings, Assets 7 (2)
Purchases, Assets 20  
Settlements, Assets (127)  
Sales, Assets (62)  
Purchases, Issuances and Settlements, net, Assets   (158)
Transfers into Level 3, Assets 166 [1] 81 [2]
Transfers out of Level 3, Assets (32) [1] (86) [2]
Ending Balance, Fair Value Assets 206 246
Corporate Obligations [Member] | Variable Interest Entities [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 82  
Unrealized Gains / (Losses) Included in Earnings, Assets (17) 6
Settlements, Assets (6)  
Purchases, Issuances and Settlements, net, Assets   83
Transfers into Level 3, Assets 17 [1] 3 [2]
Transfers out of Level 3, Assets (7) [1] (10) [2]
Ending Balance, Fair Value Assets 69 82
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets (2) (19)
Residential Mortgage-Backed Securities [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 41 48
Unrealized Gains / (Losses) Included in OCI, Assets 1 3
Purchases, Assets 2  
Settlements, Assets (1)  
Sales, Assets (2)  
Purchases, Issuances and Settlements, net, Assets   (6)
Transfers into Level 3, Assets 8 [1] 41 [2]
Transfers out of Level 3, Assets (41) [1] (45) [2]
Ending Balance, Fair Value Assets 8 41
Residential Mortgage-Backed Non-Agency [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 48 64
Realized Gains / (Losses), Assets (2) (3)
Unrealized Gains / (Losses) Included in OCI, Assets 10 38
Foreign Exchange Recognized in OCI or Earnings, Assets 2  
Purchases, Assets 12  
Settlements, Assets (22)  
Sales, Assets (18)  
Purchases, Issuances and Settlements, net, Assets   (22)
Transfers into Level 3, Assets 10 [1] 53 [2]
Transfers out of Level 3, Assets (23) [1] (82) [2]
Ending Balance, Fair Value Assets 17 48
Residential Mortgage-Backed Non-Agency [Member] | Variable Interest Entities [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 40 166
Realized Gains / (Losses), Assets   (1)
Unrealized Gains / (Losses) Included in Earnings, Assets (3) (2)
Unrealized Gains / (Losses) Included in OCI, Assets 3 3
Settlements, Assets (6)  
Sales, Assets (6)  
Purchases, Issuances and Settlements, net, Assets   (122)
Transfers into Level 3, Assets 13 [1] 25 [2]
Transfers out of Level 3, Assets (20) [1] (29) [2]
Ending Balance, Fair Value Assets 21 40
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets   4
Commercial Mortgage Backed [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 41 43
Realized Gains / (Losses), Assets (2)  
Unrealized Gains / (Losses) Included in OCI, Assets   3
Foreign Exchange Recognized in OCI or Earnings, Assets 1 (1)
Purchases, Assets 9  
Settlements, Assets (3)  
Sales, Assets (21)  
Purchases, Issuances and Settlements, net, Assets   (4)
Transfers into Level 3, Assets   2 [2]
Transfers out of Level 3, Assets (1) [1] (2) [2]
Ending Balance, Fair Value Assets 24 41
Commercial Mortgage Backed [Member] | Variable Interest Entities [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 23 3
Unrealized Gains / (Losses) Included in Earnings, Assets 9 19
Settlements, Assets (2)  
Sales, Assets (13)  
Purchases, Issuances and Settlements, net, Assets   23
Transfers into Level 3, Assets 7 [1] 2 [2]
Transfers out of Level 3, Assets (2) [1] (24) [2]
Ending Balance, Fair Value Assets 22 23
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets 3 (1)
Collateralized Debt Obligations [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 191 245
Realized Gains / (Losses), Assets (4) (14)
Unrealized Gains / (Losses) Included in OCI, Assets 25 74
Foreign Exchange Recognized in OCI or Earnings, Assets 2  
Purchases, Assets 6  
Issuances, Assets 3  
Settlements, Assets (121)  
Sales, Assets 4  
Purchases, Issuances and Settlements, net, Assets   (100)
Transfers into Level 3, Assets 50 [1] 142 [2]
Transfers out of Level 3, Assets (96) [1] (156) [2]
Ending Balance, Fair Value Assets 60 191
Collateralized Debt Obligations [Member] | Variable Interest Entities [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 245 42
Unrealized Gains / (Losses) Included in Earnings, Assets (25) (71)
Unrealized Gains / (Losses) Included in OCI, Assets (7)  
Purchases, Assets 60  
Settlements, Assets (7)  
Sales, Assets (39)  
Purchases, Issuances and Settlements, net, Assets   272
Transfers into Level 3, Assets 71 [1] 9 [2]
Transfers out of Level 3, Assets (95) [1] (7) [2]
Ending Balance, Fair Value Assets 203 245
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets 5 8
Other Asset-Backed [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 350 379
Unrealized Gains / (Losses) Included in OCI, Assets (30) 22
Purchases, Assets 9  
Settlements, Assets (22)  
Sales, Assets (2)  
Purchases, Issuances and Settlements, net, Assets   (55)
Transfers into Level 3, Assets 78 [1] 32 [2]
Transfers out of Level 3, Assets (65) [1] (28) [2]
Ending Balance, Fair Value Assets 318 350
Other Asset-Backed [Member] | Variable Interest Entities [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 81 193
Unrealized Gains / (Losses) Included in Earnings, Assets (10) 97
Settlements, Assets (2)  
Sales, Assets (19)  
Purchases, Issuances and Settlements, net, Assets   (150)
Transfers into Level 3, Assets 19 [1]  
Transfers out of Level 3, Assets (2) [1] (59) [2]
Ending Balance, Fair Value Assets 67 81
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets (4) 3
State And Municipal Tax-Exempt Bonds [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 36 50
Unrealized Gains / (Losses) Included in OCI, Assets   1
Purchases, Assets 2  
Settlements, Assets (9)  
Sales, Assets (1)  
Purchases, Issuances and Settlements, net, Assets   (15)
Ending Balance, Fair Value Assets 28 36
State And Municipal Taxable Bonds [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 14  
Realized Gains / (Losses), Assets 1  
Settlements, Assets (15)  
Purchases, Issuances and Settlements, net, Assets   14
Ending Balance, Fair Value Assets   14
Perpetual Preferred Securities [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Transfers into Level 3, Assets 1 [1]  
Ending Balance, Fair Value Assets 1  
Other Investments [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Purchases, Assets 10  
Ending Balance, Fair Value Assets 10  
Other Long Term Investments [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets   19
Purchases, Issuances and Settlements, net, Assets   (19)
Credit Derivatives [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Liabilities 4,350 3,799
Realized Gains / (Losses), Liabilities 2,477 282
Unrealized Gains / (Losses) Included in Earnings, Liabilities 440 609
Purchases, Liabilities (8)  
Settlements, Liabilities (2,477)  
Purchases, Issuances and Settlements, net, Liabilities   (340)
Transfers into Level 3, Liabilities 8 [1]  
Ending Balance, Fair Value Liabilities 4,790 4,350
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities 2,702 1,338
Credit Derivatives [Member] | Liabilities Of Consolidated VIEs [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Liabilities 768  
Unrealized Gains / (Losses) Included in Earnings, Liabilities (11) 23
Sales, Liabilities (677)  
Purchases, Issuances and Settlements, net, Liabilities   745
Ending Balance, Fair Value Liabilities 80 768
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities (80) 24
Interest Rate Derivatives [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Liabilities (5) (6)
Realized Gains / (Losses), Liabilities   (8)
Unrealized Gains / (Losses) Included in Earnings, Liabilities 1 5
Foreign Exchange Recognized in OCI or Earnings, Liabilities   4
Transfers into Level 3, Liabilities 1 [1]  
Ending Balance, Fair Value Liabilities (3) (5)
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities 12 3
Currency Derivatives [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Liabilities   (3)
Unrealized Gains / (Losses) Included in Earnings, Liabilities   5
Foreign Exchange Recognized in OCI or Earnings, Liabilities   (2)
Currency Derivatives [Member] | Liabilities Of Consolidated VIEs [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Liabilities 14  
Unrealized Gains / (Losses) Included in Earnings, Liabilities 3  
Purchases, Issuances and Settlements, net, Liabilities   14
Ending Balance, Fair Value Liabilities 17 14
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities 3  
Medium-Term Notes [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Liabilities 116 110
Unrealized Gains / (Losses) Included in Earnings, Liabilities 78 13
Foreign Exchange Recognized in OCI or Earnings, Liabilities (4) (7)
Settlements, Liabilities (25)  
Ending Balance, Fair Value Liabilities 165 116
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities 78 13
Variable Interest Entity Notes [Member] | Liabilities Of Consolidated VIEs [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Liabilities 4,673  
Unrealized Gains / (Losses) Included in Earnings, Liabilities 94 522
Foreign Exchange Recognized in OCI or Earnings, Liabilities   39
Settlements, Liabilities (554)  
Sales, Liabilities (1,324)  
Purchases, Issuances and Settlements, net, Liabilities   4,112
Ending Balance, Fair Value Liabilities 2,889 4,673
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Liabilities 94 522
Loans Receivable [Member] | Variable Interest Entities [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 2,183  
Unrealized Gains / (Losses) Included in Earnings, Assets 132 36
Foreign Exchange Recognized in OCI or Earnings, Assets   21
Purchases, Assets 24  
Settlements, Assets (291)  
Sales, Assets (2)  
Purchases, Issuances and Settlements, net, Assets   2,126
Ending Balance, Fair Value Assets 2,046 2,183
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets 132 36
Loan Repurchase Commitments [Member] | Variable Interest Entities [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance, Fair Value Assets 835  
Unrealized Gains / (Losses) Included in Earnings, Assets 230 120
Issuances, Assets 12  
Purchases, Issuances and Settlements, net, Assets   715
Ending Balance, Fair Value Assets 1,077 835
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets Still Held, Assets $ 230 $ 120
[1] Transferred in and out at the end of the period.
[2] Transferred in and out at the end of the period.