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Allowance For Credit Losses (Details 1) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Changes in the allowance for credit losses by product and the related loan          
Balance at beginning of period $ 603 $ 771 $ 743 [1] $ 852  
Provision for credit losses 89 95 89 93  
Charge-offs (91) (133) (253) (225)  
Recoveries 18 14 40 27  
Net charge offs (73) (119) (213) (198)  
Ending balance: collectively evaluated for impairment 384 472 384 472  
Ending balance: individually evaluated for impairment 235 275 235 275  
Balance at end of period 619 [1] 747 619 [1] 747  
Loans:          
Collectively evaluated for impairment 53,610 47,291 53,610 47,291  
Individually evaluated for impairment 1,599 1,543 1,599 1,543  
Loans carried at the lower of amortized cost or fair value less cost to sell 855 778 855 778  
Total loans 56,064 [1] 49,612 56,064 [1] 49,612 51,867 [1]
Commercial Loan [Member]
         
Loans:          
Total loans 37,417   37,417   33,649
Commercial Loan [Member] | Construction and other real estate [Member]
         
Changes in the allowance for credit losses by product and the related loan          
Balance at beginning of period 205 217 212 243  
Provision for credit losses (5) 49 (25) 21  
Charge-offs (2) (39) (3) (43)  
Recoveries   2 14 8  
Net charge offs (2) (37) 11 (35)  
Ending balance: collectively evaluated for impairment 87 120 87 120  
Ending balance: individually evaluated for impairment 111 109 111 109  
Balance at end of period 198 229 198 229  
Loans:          
Collectively evaluated for impairment 7,386 7,213 7,386 7,213  
Individually evaluated for impairment 591 698 591 698  
Total loans 7,977 7,911 7,977 7,911 7,860
Commercial Loan [Member] | Business banking and middle markets enterprises [Member]
         
Changes in the allowance for credit losses by product and the related loan          
Balance at beginning of period 76 119 78 132  
Provision for credit losses 15 (8) 21 (9)  
Charge-offs (13) (19) (23) (33)  
Recoveries 2 4 4 6  
Net charge offs (11) (15) (19) (27)  
Ending balance: collectively evaluated for impairment 73 79 73 79  
Ending balance: individually evaluated for impairment 7 17 7 17  
Balance at end of period 80 96 80 96  
Loans:          
Collectively evaluated for impairment 11,141 8,475 11,141 8,475  
Individually evaluated for impairment 115 156 115 156  
Total loans 11,256 8,631 11,256 8,631 10,225
Commercial Loan [Member] | Global banking [Member]
         
Changes in the allowance for credit losses by product and the related loan          
Balance at beginning of period 25 111 131 116  
Provision for credit losses 19 (1) (3) (6)  
Charge-offs     (84)    
Net charge offs     (84)    
Ending balance: collectively evaluated for impairment 31 39 31 39  
Ending balance: individually evaluated for impairment 13 71 13 71  
Balance at end of period 44 110 44 110  
Loans:          
Collectively evaluated for impairment 14,928 10,529 14,928 10,529  
Individually evaluated for impairment 114 74 114 74  
Total loans 15,042 10,603 15,042 10,603 12,658
Commercial Loan [Member] | Other commercial [Member]
         
Changes in the allowance for credit losses by product and the related loan          
Balance at beginning of period 20 23 21 32  
Provision for credit losses (7)   (9) (10)  
Charge-offs   (2)   (2)  
Recoveries 5   6 1  
Net charge offs 5 (2) 6 (1)  
Ending balance: collectively evaluated for impairment 17 17 17 17  
Ending balance: individually evaluated for impairment 1 4 1 4  
Balance at end of period 18 21 18 21  
Loans:          
Collectively evaluated for impairment 3,055 2,547 3,055 2,547  
Individually evaluated for impairment 87 101 87 101  
Total loans 3,142 2,648 3,142 2,648 2,906
Commercial Loan [Member] | Residential mortgages, excluding home equity mortgages [Member]
         
Changes in the allowance for credit losses by product and the related loan          
Balance at beginning of period 182 161 192 167  
Provision for credit losses 24 27 39 46  
Charge-offs (23) (28) (49) (54)  
Recoveries 5 2 6 3  
Net charge offs (18) (26) (43) (51)  
Ending balance: collectively evaluated for impairment 95 99 95 99  
Ending balance: individually evaluated for impairment 93 63 93 63  
Balance at end of period 188 162 188 162  
Loans:          
Collectively evaluated for impairment 13,243 12,840 13,243 12,840  
Individually evaluated for impairment 660 482 660 482  
Loans carried at the lower of amortized cost or fair value less cost to sell 855 778 855 778  
Total loans 14,758 14,100 14,758 14,100  
Consumer Loan [Member]
         
Loans:          
Total loans 18,647   18,647   18,218
Consumer Loan [Member] | Home equity mortgages [Member]
         
Changes in the allowance for credit losses by product and the related loan          
Balance at beginning of period 43 68 52 77  
Provision for credit losses 34 12 42 23  
Charge-offs (30) (18) (47) (38)  
Net charge offs (30) (18) (47) (38)  
Ending balance: collectively evaluated for impairment 43 58 43 58  
Ending balance: individually evaluated for impairment 4 4 4 4  
Balance at end of period 47 62 47 62  
Loans:          
Collectively evaluated for impairment 2,441 3,598 2,441 3,598  
Individually evaluated for impairment 14 9 14 9  
Total loans 2,455 3,607 2,455 3,607 2,563
Consumer Loan [Member] | Credit cards [Member]
         
Changes in the allowance for credit losses by product and the related loan          
Balance at beginning of period 35 48 39 58  
Provision for credit losses 9 12 20 20  
Charge-offs (16) (19) (33) (40)  
Recoveries 3 3 5 6  
Net charge offs (13) (16) (28) (34)  
Ending balance: collectively evaluated for impairment 25 37 25 37  
Ending balance: individually evaluated for impairment 6 7 6 7  
Balance at end of period 31 44 31 44  
Loans:          
Collectively evaluated for impairment 765 1,164 765 1,164  
Individually evaluated for impairment 18 23 18 23  
Total loans 783 1,187 783 1,187 828
Consumer Loan [Member] | Other consumer [Member]
         
Changes in the allowance for credit losses by product and the related loan          
Balance at beginning of period 17 24 18 27  
Provision for credit losses   4 4 8  
Charge-offs (7) (8) (14) (15)  
Recoveries 3 3 5 3  
Net charge offs (4) (5) (9) (12)  
Ending balance: collectively evaluated for impairment 13 23 13 23  
Balance at end of period 13 23 13 23  
Loans:          
Collectively evaluated for impairment 0 925 0 925  
Total loans $ 651 $ 925 $ 651 $ 925 $ 714
[1] The following table summarizes assets and liabilities related to variable interest entities ("VIEs") as of June 30, 2012 and December 31, 2011 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation.