Quarterly report pursuant to Section 13 or 15(d)

Derivatives - Net Investment and Economic Hedges (Details)

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Derivatives - Net Investment and Economic Hedges (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net gains (losses) on economic hedges [Abstract]        
Interest rate risk $ 6 [1] $ 182 [1] $ 17 [1] $ 178 [1]
Foreign currency risk 48 [1] (2,350) [1] (456) [1] 796 [1]
Credit risk (22) [1] 65 [1] (53) [1] 48 [1]
Foreign Exchange Risk [Member]
       
Net investment hedges of foreign operations [Abstract]        
Hedge Ineffectivenes and Amounts Excluded from Effectiveness Testing 12 [2] (110) [2] (86) [2] (267) [2]
Net Investment Hedging [Member] | Foreign Exchange Risk [Member]
       
Net investment hedges of foreign operations [Abstract]        
Gains (losses) Recognized in Accumulated OCI (567) 1,215 (457) 254
Gains (losses) in Income Reclassified from Accumulated OCI (12) [2] (18) [2] (49) [2] (21) [2]
Trading Account Assets [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument [Member]
       
Net investment hedges of foreign operations [Abstract]        
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Assets, Fair Value 175 690 175 690
Notional Amount of Derivative Instruments Designated as Net Investment Hedges 3,328 20,068 3,328 20,068
Trading Liabilities [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument [Member]
       
Net investment hedges of foreign operations [Abstract]        
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value 794 492 794 492
Notional Amount of Derivative Instruments Designated as Net Investment Hedges 19,560 7,338 19,560 7,338
Long-term Borrowings [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument [Member]
       
Net investment hedges of foreign operations [Abstract]        
Derivative Instruments in Hedges, Net Investment in Foreign Operations, Liabilities, Fair Value $ 0 $ 61 $ 0 $ 61
[1] Amounts are recorded in other revenues and interest expense.
[2] Amounts are recorded in other revenues.