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Business Segments (Summary Of Segments Within Wind-Down Operations) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Total revenues $ 383 $ (1,607)  
Total expenses 362 156  
Income (loss) before income taxes 21 (1,763)  
Identifiable assets 26,126 32,243 26,873
Asset / Liability Products [Member]
      
Segment Reporting Information [Line Items]      
Inter-segment revenues 4 [1] (4) [1]  
Total revenues (111) (36)  
Inter-segment expenses 8 [1] 8 [1]  
Total expenses 35 36  
Income (loss) before income taxes (146) (72)  
Identifiable assets 3,610 4,897  
Conduits [Member]
      
Segment Reporting Information [Line Items]      
Inter-segment revenues (1) [1] (1) [1]  
Total revenues 3 5  
Inter-segment expenses   1 [1]  
Total expenses 4 6  
Income (loss) before income taxes (1) (1)  
Identifiable assets 1,177 1,565  
Eliminations [Member]
      
Segment Reporting Information [Line Items]      
Identifiable assets (55) (301)  
Wind-Down Operations [Member]
      
Segment Reporting Information [Line Items]      
Inter-segment revenues 3 [1],[2] (5) [1],[2]  
Total revenues (108) (31)  
Inter-segment expenses 8 [1],[2] 9 [1],[2]  
Total expenses 39 42  
Income (loss) before income taxes (147) (73)  
Identifiable assets 4,732 6,161  
Non Variable Interest Entities [Member]
      
Segment Reporting Information [Line Items]      
Revenues 206 [3] 265 [3]  
Net gains (losses) on financial instruments at fair value and foreign exchange (19) (24)  
Net investment losses related to other-than-temporary impairments (94) (13)  
Net gains (losses) on extinguishment of debt   26  
Other net realized gains (losses) 1 5  
Operating expenses 171 92  
Interest expense 73 75  
Non Variable Interest Entities [Member] | Asset / Liability Products [Member]
      
Segment Reporting Information [Line Items]      
Revenues 19 [4] 24 [4]  
Net gains (losses) on financial instruments at fair value and foreign exchange (80) (83)  
Net investment losses related to other-than-temporary impairments (54) (11)  
Net gains (losses) on extinguishment of debt   24  
Other net realized gains (losses)   4  
Operating expenses 1 1  
Interest expense 26 27  
Non Variable Interest Entities [Member] | Conduits [Member]
      
Segment Reporting Information [Line Items]      
Revenues   1 [4]  
Non Variable Interest Entities [Member] | Wind-Down Operations [Member]
      
Segment Reporting Information [Line Items]      
Revenues 19 [3],[4] 25 [3],[4]  
Net gains (losses) on financial instruments at fair value and foreign exchange (80) (83)  
Net investment losses related to other-than-temporary impairments (54) (11)  
Net gains (losses) on extinguishment of debt   24  
Other net realized gains (losses)   4  
Operating expenses 1 1  
Interest expense 26 27  
Variable Interest Entity [Member]
      
Segment Reporting Information [Line Items]      
Net gains (losses) on financial instruments at fair value and foreign exchange (27) (107)  
Revenues of consolidated VIEs (10) (90)  
Interest expense 15 15  
Expenses of consolidated VIEs 21 25  
Identifiable assets 10,500   10,900
Variable Interest Entity [Member] | Asset / Liability Products [Member]
      
Segment Reporting Information [Line Items]      
Revenues of consolidated VIEs   10  
Variable Interest Entity [Member] | Conduits [Member]
      
Segment Reporting Information [Line Items]      
Revenues of consolidated VIEs 4 5  
Expenses of consolidated VIEs 4 5  
Variable Interest Entity [Member] | Wind-Down Operations [Member]
      
Segment Reporting Information [Line Items]      
Revenues of consolidated VIEs 4 15  
Expenses of consolidated VIEs $ 4 $ 5  
[1] Represents intercompany asset management fees and expenses plus intercompany interest income and expense pertaining to intercompany debt.
[2] Represents intercompany premium income and expense, intercompany asset management fees and expenses, and intercompany interest income and expense pertaining to intercompany receivables and payables.
[3] Represents the sum of third-party financial guarantee net premiums earned, net investment income, insurance-related fees and reimbursements, investment management fees and other fees.
[4] Represents the sum of third-party interest income, investment management services fees and other fees.