v2.4.0.6
Loans And The Allowance For Credit Losses (Schedule Of Impaired Loans On Accrual Status) (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance $ 5,193 [1] $ 5,470 [1]
Charge-offs and Payments Applied 429 [2] 466 [2]
Total Impaired Loans/Book Value 4,764 [3] 5,004 [3]
Related Allowance for Loan Losses 995 1,187
Coverage % 27.40% [4] 30.20% [4]
Commercial And Industrial [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 755 [1] 758 [1]
Charge-offs and Payments Applied 87 [2] 89 [2]
Total Impaired Loans/Book Value 668 [3] 669 [3]
Related Allowance for Loan Losses 160 189
Coverage % 32.70% [4] 36.70% [4]
Commercial Real Estate Mortgage - Owner Occupied [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 799 [1] 884 [1]
Charge-offs and Payments Applied 86 [2] 91 [2]
Total Impaired Loans/Book Value 713 [3] 793 [3]
Related Allowance for Loan Losses 190 222
Coverage % 34.50% [4] 35.40% [4]
Commercial Real Estate Construction - Owner Occupied [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 36 [1] 39 [1]
Charge-offs and Payments Applied 14 [2] 12 [2]
Total Impaired Loans/Book Value 22 [3] 27 [3]
Related Allowance for Loan Losses 7 10
Coverage % 58.30% [4] 56.40% [4]
Total Commercial [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 1,590 [1] 1,681 [1]
Charge-offs and Payments Applied 187 [2] 192 [2]
Total Impaired Loans/Book Value 1,403 [3] 1,489 [3]
Related Allowance for Loan Losses 357 421
Coverage % 34.20% [4] 36.50% [4]
Commercial Investor Real Estate Mortgage [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 1,668 [1] 1,732 [1]
Charge-offs and Payments Applied 149 [2] 143 [2]
Total Impaired Loans/Book Value 1,519 [3] 1,589 [3]
Related Allowance for Loan Losses 352 397
Coverage % 30.00% [4] 31.20% [4]
Commercial Investor Real Estate Construction [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 208 [1] 376 [1]
Charge-offs and Payments Applied 15 [2] 56 [2]
Total Impaired Loans/Book Value 193 [3] 320 [3]
Related Allowance for Loan Losses 73 143
Coverage % 42.30% [4] 52.90% [4]
Total Investor Real Estate [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 1,876 [1] 2,108 [1]
Charge-offs and Payments Applied 164 [2] 199 [2]
Total Impaired Loans/Book Value 1,712 [3] 1,909 [3]
Related Allowance for Loan Losses 425 540
Coverage % 31.40% [4] 35.10% [4]
Residential First Mortgage [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 1,220 [1] 1,171 [1]
Charge-offs and Payments Applied 64 [2] 61 [2]
Total Impaired Loans/Book Value 1,156 [3] 1,110 [3]
Related Allowance for Loan Losses 171 163
Coverage % 19.30% [4] 19.10% [4]
Home Equity [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 457 [1] 454 [1]
Charge-offs and Payments Applied 14 [2] 14 [2]
Total Impaired Loans/Book Value 443 [3] 440 [3]
Related Allowance for Loan Losses 41 62
Coverage % 12.00% [4] 16.70% [4]
Indirect [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 2 [1] 1 [1]
Total Impaired Loans/Book Value 2 [3] 1 [3]
Other Consumer [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 48 [1] 55 [1]
Total Impaired Loans/Book Value 48 [3] 55 [3]
Related Allowance for Loan Losses 1 1
Coverage % 2.10% [4] 1.80% [4]
Total Consumer [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 1,727 [1] 1,681 [1]
Charge-offs and Payments Applied 78 [2] 75 [2]
Total Impaired Loans/Book Value 1,649 [3] 1,606 [3]
Related Allowance for Loan Losses 213 226
Coverage % 16.90% [4] 17.90% [4]
Accrual [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 3,140 [1] 3,008 [1]
Charge-offs and Payments Applied 38 [2] 27 [2]
Total Impaired Loans/Book Value 3,102 2,981
Related Allowance for Loan Losses 508 554
Coverage % 17.40% [4] 19.30% [4]
Accrual [Member] | Commercial And Industrial [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 318 [1] 290 [1]
Charge-offs and Payments Applied 7 [2] 1 [2]
Total Impaired Loans/Book Value 311 289
Related Allowance for Loan Losses 51 60
Coverage % 18.20% [4] 21.00% [4]
Accrual [Member] | Commercial Real Estate Mortgage - Owner Occupied [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 212 [1] 205 [1]
Charge-offs and Payments Applied 4 [2] 3 [2]
Total Impaired Loans/Book Value 208 202
Related Allowance for Loan Losses 28 30
Coverage % 15.10% [4] 16.10% [4]
Accrual [Member] | Commercial Real Estate Construction - Owner Occupied [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 3 [1] 2 [1]
Total Impaired Loans/Book Value 3 2
Related Allowance for Loan Losses 1  
Coverage % 33.30% [4]  
Accrual [Member] | Total Commercial [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 533 [1] 497 [1]
Charge-offs and Payments Applied 11 [2] 4 [2]
Total Impaired Loans/Book Value 522 493
Related Allowance for Loan Losses 80 90
Coverage % 17.10% [4] 18.90% [4]
Accrual [Member] | Commercial Investor Real Estate Mortgage [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 928 [1] 862 [1]
Charge-offs and Payments Applied 8 [2] 7 [2]
Total Impaired Loans/Book Value 920 855
Related Allowance for Loan Losses 175 174
Coverage % 19.70% [4] 21.00% [4]
Accrual [Member] | Commercial Investor Real Estate Construction [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 120 [1] 140 [1]
Charge-offs and Payments Applied 1 [2]  
Total Impaired Loans/Book Value 119 140
Related Allowance for Loan Losses 55 81
Coverage % 46.70% [4] 57.90% [4]
Accrual [Member] | Total Investor Real Estate [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 1,048 [1] 1,002 [1]
Charge-offs and Payments Applied 9 [2] 7 [2]
Total Impaired Loans/Book Value 1,039 995
Related Allowance for Loan Losses 230 255
Coverage % 22.80% [4] 26.10% [4]
Accrual [Member] | Residential First Mortgage [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 1,079 [1] 1,025 [1]
Charge-offs and Payments Applied 13 [2] 12 [2]
Total Impaired Loans/Book Value 1,066 1,013
Related Allowance for Loan Losses 158 148
Coverage % 15.80% [4] 15.60% [4]
Accrual [Member] | Home Equity [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 430 [1] 428 [1]
Charge-offs and Payments Applied 5 [2] 4 [2]
Total Impaired Loans/Book Value 425 424
Related Allowance for Loan Losses 39 60
Coverage % 10.20% [4] 15.00% [4]
Accrual [Member] | Indirect [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 2 [1] 1 [1]
Total Impaired Loans/Book Value 2 1
Accrual [Member] | Other Consumer [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 48 [1] 55 [1]
Total Impaired Loans/Book Value 48 55
Related Allowance for Loan Losses 1 1
Coverage % 2.10% [4] 1.80% [4]
Accrual [Member] | Total Consumer [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 1,559 [1] 1,509 [1]
Charge-offs and Payments Applied 18 [2] 16 [2]
Total Impaired Loans/Book Value 1,541 1,493
Related Allowance for Loan Losses $ 198 $ 209
Coverage % 13.90% [4] 14.90% [4]
[1] Unpaid principal balance represents the contractual obligation due from the customer and includes the net book value plus charge-offs and payments applied.
[2] Charge-offs and payments applied represents cumulative partial charge-offs taken, as well as interest payments received that have been applied against the outstanding principal balance.
[3] Book value represents the unpaid principal balance less charge-offs and payments applied; it is shown before any allowance for loan losses.
[4] Coverage % represents charge-offs and payments applied plus the related allowance as a percent of the unpaid principal balance.