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Derivative Financial Instruments (Derivative Classifications and Hedging Relationships) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Derivative Asset, Fair Value $ 1,690 [1] $ 1,525 [1]
Derivative Financial Instruments, Notional Values 81,407 67,581
Derivative Liability, Fair Value (1,737) [1] (1,506) [1]
Net Investment Hedging [Member]
    
Notional Amount of Derivatives as Net Investment Hedge 73 73
Net Investment Hedge Derivative Instrument Assets at Fair Value 0 [1] 1 [1]
Net Investment Hedge Derivative Instrument Liabilities at Fair Value (2) [1] 0 [1]
Net Investment Hedging [Member] | Foreign Exchange Contract [Member]
    
Notional Amount of Derivatives as Net Investment Hedge 73 73
Net Investment Hedge Derivative Instrument Assets at Fair Value 0 [1] 1 [1]
Net Investment Hedge Derivative Instrument Liabilities at Fair Value (2) [1] 0 [1]
Cash Flow Hedges [Member]
    
Designated Notional Values, Derivatives as Cash Flow Hedges 6,035 [2] 5,750 [2]
Cash Flow Hedge Derivative Instrument Assets at Fair Value 0 [1],[2] 0 [1],[2]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value (321) [1],[2] (307) [1],[2]
Cash Flow Hedges [Member] | Interest Rate Contract [Member] | Pay Fixed Swaps [Member] | Three Month LIBOR Funding [Member]
    
Designated Notional Values, Derivatives as Cash Flow Hedges 6,035 [2] 5,750 [2]
Cash Flow Hedge Derivative Instrument Assets at Fair Value 0 [1],[2] 0 [1],[2]
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value (321) [1],[2] (307) [1],[2]
Fair Value Hedges [Member] | Interest Rate Contract [Member]
    
Notional Value of Derivatives as Fair Value Hedge 1,333 3,009
Fair Value Hedge Assets 195 [1] 254 [1]
Fair Value Hedge Liabilities (169) [1] (163) [1]
Fair Value Hedges [Member] | Interest Rate Contract [Member] | Pay Fixed Swaps [Member] | Commercial Loans [Member]
    
Notional Value of Derivatives as Fair Value Hedge 188 98
Fair Value Hedge Assets 0 [1] 0 [1]
Fair Value Hedge Liabilities (7) [1] (5) [1]
Fair Value Hedges [Member] | Interest Rate Contract [Member] | Pay Fixed Swaps [Member] | Municipal Securities [Member]
    
Notional Value of Derivatives as Fair Value Hedge 345 355
Fair Value Hedge Assets 0 [1] 0 [1]
Fair Value Hedge Liabilities (162) [1] (158) [1]
Fair Value Hedges [Member] | Interest Rate Contract [Member] | Receive Fixed Swaps And Option Trades [Member] | Long-term Debt [Member]
    
Notional Value of Derivatives as Fair Value Hedge 800 2,556
Fair Value Hedge Assets 195 [1] 254 [1]
Fair Value Hedge Liabilities 0 [1] 0 [1]
Not Designated as Hedging Instrument [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 73,966 58,749
Derivative Asset, Fair Value 1,495 [1] 1,270 [1]
Derivative Liability, Fair Value (1,245) [1] (1,036) [1]
Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 23,485 22,850
Derivative Asset, Fair Value 783 [1] 747 [1]
Derivative Liability, Fair Value (809) [1] (784) [1]
Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Interest Rate Contract [Member] | Received Fixed Swaps [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 9,477 9,176
Derivative Asset, Fair Value 741 [1] 703 [1]
Derivative Liability, Fair Value 0 [1] 0 [1]
Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Interest Rate Contract [Member] | Pay Fixed Swaps [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 9,607 9,255
Derivative Asset, Fair Value 0 [1] 0 [1]
Derivative Liability, Fair Value (771) [1] (730) [1]
Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Interest Rate Contract [Member] | Other Swaps [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 2,341 2,450
Derivative Asset, Fair Value 1 [1] 0 [1]
Derivative Liability, Fair Value (2) [1] (6) [1]
Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Interest Rate Contract [Member] | Option Trades [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 821 1,004
Derivative Asset, Fair Value 27 [1] 38 [1]
Derivative Liability, Fair Value (28) [1] (40) [1]
Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Interest Rate Contract [Member] | Futures Contracts [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 135 240
Derivative Asset, Fair Value 0 [1] 0 [1]
Derivative Liability, Fair Value 0 [1] 0 [1]
Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Interest Rate Contract [Member] | Risk Participations [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 151 150
Derivative Asset, Fair Value 0 [1] 0 [1]
Derivative Liability, Fair Value 0 [1] 0 [1]
Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Foreign Exchange Contract [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 953 575
Derivative Asset, Fair Value 14 [1] 6 [1]
Derivative Liability, Fair Value (8) [1] (8) [1]
Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Interest Rate Contract [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 15,419 12,303
Derivative Asset, Fair Value 152 [1] 77 [1]
Derivative Liability, Fair Value (160) [1] (89) [1]
Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Interest Rate Contract [Member] | Received Fixed Swaps [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 118 50
Derivative Asset, Fair Value 1 [1] 1 [1]
Derivative Liability, Fair Value 0 [1] 0 [1]
Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Interest Rate Contract [Member] | Pay Fixed Swaps [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 0 16
Derivative Asset, Fair Value 0 [1] 0 [1]
Derivative Liability, Fair Value 0 [1] 0 [1]
Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Interest Rate Contract [Member] | Interest Rate Lock Commitments [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 6,380 4,977
Derivative Asset, Fair Value 128 [1] 60 [1]
Derivative Liability, Fair Value 0 [1] (1) [1]
Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Interest Rate Contract [Member] | When Issued Securities And Forward Rate Agreements And Forward Commitments [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 8,822 7,125
Derivative Asset, Fair Value 17 [1] 10 [1]
Derivative Liability, Fair Value (160) [1] (88) [1]
Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Interest Rate Contract [Member] | Option Trades [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 70 70
Derivative Asset, Fair Value 6 [1] 5 [1]
Derivative Liability, Fair Value 0 [1] 0 [1]
Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Interest Rate Contract [Member] | Futures Contracts [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 29 65
Derivative Asset, Fair Value 0 [1] 1 [1]
Derivative Liability, Fair Value 0 [1] 0 [1]
Not Designated as Hedging Instrument [Member] | Mortgage Servicing Rights [Member] | Interest Rate Contract [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 35,062 23,596
Derivative Asset, Fair Value 560 [1] 446 [1]
Derivative Liability, Fair Value (276) [1] (163) [1]
Not Designated as Hedging Instrument [Member] | Mortgage Servicing Rights [Member] | Interest Rate Contract [Member] | Received Fixed Swaps [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 6,234 5,616
Derivative Asset, Fair Value 142 [1] 154 [1]
Derivative Liability, Fair Value (5) [1] (1) [1]
Not Designated as Hedging Instrument [Member] | Mortgage Servicing Rights [Member] | Interest Rate Contract [Member] | Pay Fixed Swaps [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 5,483 4,651
Derivative Asset, Fair Value 1 [1] 1 [1]
Derivative Liability, Fair Value (125) [1] (111) [1]
Not Designated as Hedging Instrument [Member] | Mortgage Servicing Rights [Member] | Interest Rate Contract [Member] | When Issued Securities And Forward Rate Agreements And Forward Commitments [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 3,145 3,651
Derivative Asset, Fair Value 9 [1] 18 [1]
Derivative Liability, Fair Value 0 [1] 0 [1]
Not Designated as Hedging Instrument [Member] | Mortgage Servicing Rights [Member] | Interest Rate Contract [Member] | Option Trades [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 20,200 9,640
Derivative Asset, Fair Value 408 [1] 273 [1]
Derivative Liability, Fair Value (146) [1] (51) [1]
Not Designated as Hedging Instrument [Member] | Mortgage Servicing Rights [Member] | Interest Rate Contract [Member] | Futures Contracts [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 0 38
Derivative Asset, Fair Value 0 [1] 0 [1]
Derivative Liability, Fair Value $ 0 [1] $ 0 [1]
[1] Derivatives in a gain position are recorded as Other assets and derivatives in a loss position are recorded as Other liabilities on the Consolidated Balance Sheets.
[2] Cash flow hedges are hedging the first unhedged forecasted settlements associated with the listed hedged item descriptions.