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Derivative Financial Instruments (Derivative Classifications and Hedging Relationships) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Derivative Financial Instruments, Notional Values $ 64,111 $ 72,795
Total derivative asset 1,315 1,450
Amounts Subject to Master Netting Arrangements Not Offset Due to Policy Election Assets Column (653) (797)
Cash collateral received to secure loss from counterparty related to derivative credit risk (68) (41)
Net amount 594 612
Total derivative liability (1,336) (1,437)
Amounts Subject to Master Netting Arrangements Not Offset Due to Policy Election Liabilities Column 653 797
Cash collateral posted related to derivative activities 549 607
Net amount (134) (33)
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 4,950 6,035
Cash Flow Hedge Derivative Instrument Assets at Fair Value 0 0
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value (229) (298)
Fair Value Hedges [Member] | Interest Rate Contract [Member]
    
Notional Value of Derivatives as Fair Value Hedge 1,330 1,332
Fair Value Hedge Assets 96 182
Fair Value Hedge Liabilities (110) (160)
Fair Value Hedges [Member] | Interest Rate Contract [Member] | Received Fixed Swaps And Option Trades [Member] | Long-term Debt [Member]
    
Notional Value of Derivatives as Fair Value Hedge 800 800
Fair Value Hedge Assets 96 182
Fair Value Hedge Liabilities 0 0
Fair Value Hedges [Member] | Interest Rate Contract [Member] | Pay Fixed Swaps [Member] | Commercial Loans [Member]
    
Notional Value of Derivatives as Fair Value Hedge 185 187
Fair Value Hedge Assets 0 0
Fair Value Hedge Liabilities (4) (7)
Fair Value Hedges [Member] | Interest Rate Contract [Member] | Pay Fixed Swaps [Member] | Municipal Securities [Member]
    
Notional Value of Derivatives as Fair Value Hedge 345 345
Fair Value Hedge Assets 0 0
Fair Value Hedge Liabilities (106) (153)
Not Designated as Hedging Instrument [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 57,831 65,428
Total derivative asset 1,219 1,268
Total derivative liability (997) (979)
Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 21,002 22,750
Total derivative asset 481 715
Total derivative liability (513) (748)
Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member] | Interest Rate Contract [Member] | Receive Fixed Swaps [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 9,109 9,352
Total derivative asset 448 687
Total derivative liability (21) 0
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 9,060 9,464
Total derivative asset 17 0
Total derivative liability (476) (717)
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 1,668 2,664
Total derivative asset 10 21
Total derivative liability (12) (23)
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 455 423
Total derivative asset 2 3
Total derivative liability (2) (5)
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 45 109
Total derivative asset 0 0
Total derivative liability 0 0
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 208 204
Total derivative asset 0 0
Total derivative liability 0 0
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 457 534
Total derivative asset 4 4
Total derivative liability (2) (3)
Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Interest Rate Contract [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 12,463 15,165
Total derivative asset 311 71
Total derivative liability (158) (22)
Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Interest Rate Contract [Member] | Receive Fixed Swaps [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 240 114
Total derivative asset 0 0
Total derivative liability (8) (2)
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 66 0
Total derivative asset 1 0
Total derivative liability 0 0
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 4,927 6,064
Total derivative asset 7 55
Total derivative liability (96) (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 6,764 8,886
Total derivative asset 291 10
Total derivative liability (54) (19)
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 460 70
Total derivative asset 12 6
Total derivative liability 0 0
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 6 31
Total derivative asset 0 0
Total derivative liability 0 0
Not Designated as Hedging Instrument [Member] | Mortgage Servicing Rights [Member] | Interest Rate Contract [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 24,366 27,513
Total derivative asset 427 482
Total derivative liability (326) (209)
Not Designated as Hedging Instrument [Member] | Mortgage Servicing Rights [Member] | Interest Rate Contract [Member] | Receive Fixed Swaps [Member]
    
Notional Amount of Other Derivatives Not Designated as Hedging Instruments 7,344 5,178
Total derivative asset 41 110
Total derivative liability (228) (27)
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 5,951 5,389
Total derivative asset 165 7
Total derivative liability (39) (94)
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 2,271 2,406
Total derivative asset 0 2
Total derivative liability (15) 0
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 8,800 14,510
Total derivative asset 221 363
Total derivative liability (44) (88)
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 30
Total derivative asset 0 0
Total derivative liability $ 0 $ 0