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Derivative Instruments (Details Textual) (USD $)
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Interest Rate Contracts [Member]
Jun. 30, 2011
Interest Rate Contracts [Member]
Jun. 30, 2012
Interest Rate Contracts [Member]
Jun. 30, 2011
Interest Rate Contracts [Member]
Jun. 30, 2012
Foreign Exchange Rate Contracts [Member]
Jun. 30, 2011
Foreign Exchange Rate Contracts [Member]
Jun. 30, 2012
Foreign Exchange Rate Contracts [Member]
Jun. 30, 2011
Foreign Exchange Rate Contracts [Member]
Derivative Instruments (Additional Textual) [Abstract]                    
Total Notional Value $ 63,300,000,000                  
Notional amount of asset and liability management derivative positions designated as fair value or cash flow or net investment hedge 11,800,000,000                  
Realized and unrealized losses on derivatives classified as cash flow hedges recorded in other comprehensive income (loss) 447,000,000 489,000,000                
Estimated loss to be reclassified from other comprehensive income (loss) into earnings during the remainder of the year 57,000,000                  
Estimated loss to be reclassified from other comprehensive income (loss) into earnings for next 12 months 114,000,000                  
Fair value of derivatives under collateral agreements in a net liability position 1,800,000,000                  
Cash and money market investments collateral posted by counterparties netted against derivative assets 88,000,000 88,000,000                
Collateral posted by company netted against net liability position 1,800,000,000 0                
Cash collateral posted by the Company netted against derivative liabilities 634,000,000 1,700,000,000                
Forward commitment to sell mortgage loan 19,700,000,000                  
Hedged mortgage loan held for sale 8,200,000,000                  
Unfunded mortgage loan commitments 17,500,000,000                  
Carrying amount of non-derivative debt instruments designated as net investment hedges 694,000,000 0                
Derivative Instruments (Textual) [Abstract]                    
Gain losses on items hedged by fair value hedges     $ (3,000,000) $ (10,000,000) $ (3,000,000) $ (24,000,000) $ 1,000,000 $ (25,000,000) $ (44,000,000) $ (97,000,000)