v2.4.0.6
Loans And The Allowance For Credit Losses (Schedule Of Impaired Loans On Non-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]
Impaired Loans on Non-accrual Status with No Related Allowance 193 [3] 182 [3]
Impaired Loans on Non-accrual Status with Related Allowance 4,571 [3] 4,822 [3]
Impaired Loans with Related Allowance 995 1,187
Coverage % 27.40% [4] 30.20% [4]
Non-Accrual [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 2,053 [1] 2,462 [1]
Charge-offs and Payments Applied 391 [2] 439 [2]
Total Impaired Loans/Book Value 1,662 [3] 2,023 [3]
Impaired Loans on Non-accrual Status with No Related Allowance 193 [3] 182 [3]
Impaired Loans on Non-accrual Status with Related Allowance 1,469 [3] 1,841 [3]
Impaired Loans with Related Allowance 487 633
Coverage % 42.80% [4] 43.50% [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]
Impaired Loans on Non-accrual Status with No Related Allowance 51 [3] 61 [3]
Impaired Loans on Non-accrual Status with Related Allowance 617 [3] 608 [3]
Impaired Loans with Related Allowance 160 189
Coverage % 32.70% [4] 36.70% [4]
Commercial And Industrial [Member] | Non-Accrual [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 437 [1] 468 [1]
Charge-offs and Payments Applied 80 [2] 88 [2]
Total Impaired Loans/Book Value 357 [3] 380 [3]
Impaired Loans on Non-accrual Status with No Related Allowance 51 [3] 61 [3]
Impaired Loans on Non-accrual Status with Related Allowance 306 [3] 319 [3]
Impaired Loans with Related Allowance 109 129
Coverage % 43.20% [4] 46.40% [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]
Impaired Loans on Non-accrual Status with No Related Allowance 48 [3] 34 [3]
Impaired Loans on Non-accrual Status with Related Allowance 665 [3] 759 [3]
Impaired Loans with Related Allowance 190 222
Coverage % 34.50% [4] 35.40% [4]
Commercial Real Estate Mortgage - Owner Occupied [Member] | Non-Accrual [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 587 [1] 679 [1]
Charge-offs and Payments Applied 82 [2] 88 [2]
Total Impaired Loans/Book Value 505 [3] 591 [3]
Impaired Loans on Non-accrual Status with No Related Allowance 48 [3] 34 [3]
Impaired Loans on Non-accrual Status with Related Allowance 457 [3] 557 [3]
Impaired Loans with Related Allowance 162 192
Coverage % 41.60% [4] 41.20% [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]
Impaired Loans on Non-accrual Status with No Related Allowance 3 [3] 1 [3]
Impaired Loans on Non-accrual Status with Related Allowance 19 [3] 26 [3]
Impaired Loans with Related Allowance 7 10
Coverage % 58.30% [4] 56.40% [4]
Commercial Real Estate Construction - Owner Occupied [Member] | Non-Accrual [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 33 [1] 37 [1]
Charge-offs and Payments Applied 14 [2] 12 [2]
Total Impaired Loans/Book Value 19 [3] 25 [3]
Impaired Loans on Non-accrual Status with No Related Allowance 3 [3] 1 [3]
Impaired Loans on Non-accrual Status with Related Allowance 16 [3] 24 [3]
Impaired Loans with Related Allowance 6 10
Coverage % 60.60% [4] 59.50% [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]
Impaired Loans on Non-accrual Status with No Related Allowance 102 [3] 96 [3]
Impaired Loans on Non-accrual Status with Related Allowance 1,301 [3] 1,393 [3]
Impaired Loans with Related Allowance 357 421
Coverage % 34.20% [4] 36.50% [4]
Total Commercial [Member] | Non-Accrual [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 1,057 [1] 1,184 [1]
Charge-offs and Payments Applied 176 [2] 188 [2]
Total Impaired Loans/Book Value 881 [3] 996 [3]
Impaired Loans on Non-accrual Status with No Related Allowance 102 [3] 96 [3]
Impaired Loans on Non-accrual Status with Related Allowance 779 [3] 900 [3]
Impaired Loans with Related Allowance 277 331
Coverage % 42.90% [4] 43.80% [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]
Impaired Loans on Non-accrual Status with No Related Allowance 79 [3] 63 [3]
Impaired Loans on Non-accrual Status with Related Allowance 1,440 [3] 1,526 [3]
Impaired Loans with Related Allowance 352 397
Coverage % 30.00% [4] 31.20% [4]
Commercial Investor Real Estate Mortgage [Member] | Non-Accrual [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 740 [1] 870 [1]
Charge-offs and Payments Applied 141 [2] 136 [2]
Total Impaired Loans/Book Value 599 [3] 734 [3]
Impaired Loans on Non-accrual Status with No Related Allowance 79 [3] 63 [3]
Impaired Loans on Non-accrual Status with Related Allowance 520 [3] 671 [3]
Impaired Loans with Related Allowance 177 223
Coverage % 43.00% [4] 41.30% [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]
Impaired Loans on Non-accrual Status with No Related Allowance 12 [3] 23 [3]
Impaired Loans on Non-accrual Status with Related Allowance 181 [3] 297 [3]
Impaired Loans with Related Allowance 73 143
Coverage % 42.30% [4] 52.90% [4]
Commercial Investor Real Estate Construction [Member] | Non-Accrual [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 88 [1] 236 [1]
Charge-offs and Payments Applied 14 [2] 56 [2]
Total Impaired Loans/Book Value 74 [3] 180 [3]
Impaired Loans on Non-accrual Status with No Related Allowance 12 [3] 23 [3]
Impaired Loans on Non-accrual Status with Related Allowance 62 [3] 157 [3]
Impaired Loans with Related Allowance 18 62
Coverage % 36.40% [4] 50.00% [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]
Impaired Loans on Non-accrual Status with No Related Allowance 91 [3] 86 [3]
Impaired Loans on Non-accrual Status with Related Allowance 1,621 [3] 1,823 [3]
Impaired Loans with Related Allowance 425 540
Coverage % 31.40% [4] 35.10% [4]
Total Investor Real Estate [Member] | Non-Accrual [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 828 [1] 1,106 [1]
Charge-offs and Payments Applied 155 [2] 192 [2]
Total Impaired Loans/Book Value 673 [3] 914 [3]
Impaired Loans on Non-accrual Status with No Related Allowance 91 [3] 86 [3]
Impaired Loans on Non-accrual Status with Related Allowance 582 [3] 828 [3]
Impaired Loans with Related Allowance 195 285
Coverage % 42.30% [4] 43.10% [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]
Impaired Loans on Non-accrual Status with Related Allowance 1,156 [3] 1,110 [3]
Impaired Loans with Related Allowance 171 163
Coverage % 19.30% [4] 19.10% [4]
Residential First Mortgage [Member] | Non-Accrual [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 141 [1] 146 [1]
Charge-offs and Payments Applied 51 [2] 49 [2]
Total Impaired Loans/Book Value 90 [3] 97 [3]
Impaired Loans on Non-accrual Status with Related Allowance 90 [3] 97 [3]
Impaired Loans with Related Allowance 13 15
Coverage % 45.40% [4] 43.80% [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]
Impaired Loans on Non-accrual Status with Related Allowance 443 [3] 440 [3]
Impaired Loans with Related Allowance 41 62
Coverage % 12.00% [4] 16.70% [4]
Home Equity [Member] | Non-Accrual [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 27 [1] 26 [1]
Charge-offs and Payments Applied 9 [2] 10 [2]
Total Impaired Loans/Book Value 18 [3] 16 [3]
Impaired Loans on Non-accrual Status with Related Allowance 18 [3] 16 [3]
Impaired Loans with Related Allowance 2 2
Coverage % 40.70% [4] 46.20% [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]
Impaired Loans on Non-accrual Status with Related Allowance 1,649 [3] 1,606 [3]
Impaired Loans with Related Allowance 213 226
Coverage % 16.90% [4] 17.90% [4]
Total Consumer [Member] | Non-Accrual [Member]
    
Financing Receivable, Recorded Investment [Line Items]    
Unpaid Principal Balance 168 [1] 172 [1]
Charge-offs and Payments Applied 60 [2] 59 [2]
Total Impaired Loans/Book Value 108 [3] 113 [3]
Impaired Loans on Non-accrual Status with Related Allowance 108 [3] 113 [3]
Impaired Loans with Related Allowance 15 17
Coverage % 44.60% [4] 44.20% [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]
Impaired Loans on Non-accrual Status with Related Allowance 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]
Impaired Loans on Non-accrual Status with Related Allowance 48 [3] 55 [3]
Impaired Loans with Related Allowance $ 1 $ 1
Coverage % 2.10% [4] 1.80% [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.