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Derivative Financial Instruments (Derivative Classifications and Hedging Relationships) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivative financial instruments, notional values $ 62,771 $ 72,795
Total derivative asset 996 1,450
Amounts subject to master netting arrangements not offset due to policy election, assets column (580) (797)
Cash collateral received to secure loss from counterparty related to derivative credit risk (36) (41)
Net amount 380 612
Total derivative liability (1,156) (1,437)
Amounts subject to master netting arrangements not offset due to policy election, liabilities column 580 797
Cash collateral posted related to derivative activities 491 607
Net amount (85) (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 (222) (298)
Fair Value Hedges [Member] | Interest Rate Contract [Member]
    
Notional value of derivatives as fair value hedge 6,849 1,332
Fair value hedge assets 156 182
Fair value hedge liabilities (102) (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 6,322 800
Fair value hedge assets 156 182
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 182 187
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 (98) (153)
Not Designated as Hedging Instrument [Member]
    
Notional amount of other derivatives not designated as hedging instruments 50,972 65,428
Total derivative asset 840 1,268
Total derivative liability (832) (979)
Not Designated as Hedging Instrument [Member] | Client-Related and Other Risk Management [Member]
    
Notional amount of other derivatives not designated as hedging instruments 20,322 22,750
Total derivative asset 460 715
Total derivative liability (496) (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 8,902 9,352
Total derivative asset 431 687
Total derivative liability (20) 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 8,789 9,464
Total derivative asset 16 0
Total derivative liability (460) (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 1,487 2,664
Total derivative asset 9 21
Total derivative liability (10) (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 453 423
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 92 109
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 216 204
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 383 534
Total derivative asset 2 4
Total derivative liability (4) (3)
Not Designated as Hedging Instrument [Member] | Mortgage Banking [Member] | Interest Rate Contract [Member]
    
Notional amount of other derivatives not designated as hedging instruments 9,261 15,165
Total derivative asset 77 71
Total derivative liability (128) (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 218 114
Total derivative asset 1 0
Total derivative liability (5) (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 65 0
Total derivative asset 0 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 3,087 6,064
Total derivative asset 47 55
Total derivative liability (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 5,543 8,886
Total derivative asset 18 10
Total derivative liability (122) (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 340 70
Total derivative asset 11 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 8 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 21,389 27,513
Total derivative asset 303 482
Total derivative liability (208) (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 5,450 5,178
Total derivative asset 45 110
Total derivative liability (114) (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 4,931 5,389
Total derivative asset 57 7
Total derivative liability (56) (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 1,733 2,406
Total derivative asset 7 2
Total derivative liability 0 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 9,275 14,510
Total derivative asset 194 363
Total derivative liability (38) (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