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Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses and Related Loan Balance by Product (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       $ 647       $ 743 $ 647 $ 743 $ 852
Provision for credit losses 51 54 67 21 120 84 89 0 193 293 258
Charge-offs                 (288) (452) (386)
Recoveries                 54 63 65
Net (charge offs) recoveries                 (234) (389) (321)
Allowance on loans transferred to held for sale                     (46)
Other                 0 0 0
Balance at end of period 606       647       606 647 743
Ending balance: collectively evaluated for impairment 496       437       496 437 428
Ending balance: individually evaluated for impairment 110       210       110 210 315
Total allowances for credit losses 606       647       606 647 743
Collectively evaluated for impairment 65,341       60,718       65,341 60,718 49,450
Individually evaluated for impairment 742 [1]       1,063 [1]       742 [1] 1,063 [1] 1,365
Loans carried at the lower of amortized cost or fair value less cost to sell 1,612       1,477       1,612 1,477 1,052
Total loans 67,695       63,258       67,695 63,258 51,867
Commercial Loan [Member]
                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Total loans 48,494       44,150       48,494 44,150  
Commercial Loan [Member] | Construction and Other Real Estate [Member]
                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       162       212 162 212 243
Provision for credit losses                 (7) (33) 11
Charge-offs                 (62) (36) (51)
Recoveries                 15 19 9
Net (charge offs) recoveries                 (47) (17) (42)
Allowance on loans transferred to held for sale                     0
Other                 0 0 0
Balance at end of period 108       162       108 162 212
Ending balance: collectively evaluated for impairment 76       76       76 76 98
Ending balance: individually evaluated for impairment 32       86       32 86 114
Total allowances for credit losses 108       162       108 162 212
Collectively evaluated for impairment 8,701       7,960       8,701 7,960 7,127
Individually evaluated for impairment 333 [1]       497 [1]       333 [1] 497 [1] 733
Loans carried at the lower of amortized cost or fair value less cost to sell 0       0       0 0 0
Total loans 9,034       8,457       9,034 8,457 7,860
Commercial Loan [Member] | Business and Corporate Banking [Member]
                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       97       78 97 78 132
Provision for credit losses                 48 48 (3)
Charge-offs                 (42) (37) (53)
Recoveries                 9 8 12
Net (charge offs) recoveries                 (33) (29) (41)
Allowance on loans transferred to held for sale                     (10)
Other                 0 0 0
Balance at end of period 112       97       112 97 78
Ending balance: collectively evaluated for impairment 109       87       109 87 66
Ending balance: individually evaluated for impairment 3       10       3 10 12
Total allowances for credit losses 112       97       112 97 78
Collectively evaluated for impairment 14,420       12,502       14,420 12,502 10,098
Individually evaluated for impairment 26 [1]       106 [1]       26 [1] 106 [1] 127
Loans carried at the lower of amortized cost or fair value less cost to sell 0       0       0 0 0
Total loans 14,446       12,608       14,446 12,608 10,225
Commercial Loan [Member] | Global Banking [Member]
                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       41       131 41 131 116
Provision for credit losses                 26 14 31
Charge-offs                 0 (105) 0
Recoveries                 1 1 0
Net (charge offs) recoveries                 1 (104) 0
Allowance on loans transferred to held for sale                     (16)
Other                 0 0 0
Balance at end of period 68       41       68 41 131
Ending balance: collectively evaluated for impairment 63       41       63 41 41
Ending balance: individually evaluated for impairment 5       0       5 0 90
Total allowances for credit losses 68       41       68 41 131
Collectively evaluated for impairment 21,560       19,991       21,560 19,991 12,521
Individually evaluated for impairment 65 [1]       18 [1]       65 [1] 18 [1] 137
Loans carried at the lower of amortized cost or fair value less cost to sell 0       0       0 0 0
Total loans 21,625       20,009       21,625 20,009 12,658
Commercial Loan [Member] | Other Commercial [Member]
                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       17       21 17 21 32
Provision for credit losses                 (5) (10) (28)
Charge-offs                 0 (1) (6)
Recoveries                 8 7 23
Net (charge offs) recoveries                 8 6 17
Allowance on loans transferred to held for sale                     0
Other                 0 0 0
Balance at end of period 20       17       20 17 21
Ending balance: collectively evaluated for impairment 20       17       20 17 21
Ending balance: individually evaluated for impairment 0       0       0 0 0
Total allowances for credit losses 20       17       20 17 21
Collectively evaluated for impairment 3,346       3,000       3,346 3,000 2,816
Individually evaluated for impairment 43 [1]       76 [1]       43 [1] 76 [1] 90
Loans carried at the lower of amortized cost or fair value less cost to sell 0       0       0 0 0
Total loans 3,389       3,076       3,389 3,076 2,906
Consumer Loans [Member]
                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at end of period 77       114       77 114  
Total allowances for credit losses 77       114       77 114  
Total loans 19,201       19,108       19,201 19,108  
Consumer Loans [Member] | Residential Mortgages [Member]
                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       210       192 210 192 167
Provision for credit losses                 42 114 133
Charge-offs                 (78) (107) (106)
Recoveries                 12 11 5
Net (charge offs) recoveries                 (66) (96) (101)
Allowance on loans transferred to held for sale                     (7)
Other                 0 0 0
Balance at end of period 186       210       186 210 192
Ending balance: collectively evaluated for impairment 120       105       120 105 104
Ending balance: individually evaluated for impairment 66       105       66 105 88
Total allowances for credit losses 186       210       186 210 192
Collectively evaluated for impairment 13,967       13,563       13,967 13,563 12,817
Individually evaluated for impairment 247 [1]       331 [1]       247 [1] 331 [1] 244
Loans carried at the lower of amortized cost or fair value less cost to sell 1,612       1,477       1,612 1,477 1,052
Total loans 15,826 [2]       15,371       15,826 [2] 15,371 14,113
Consumer Loans [Member] | Home Equity Mortgages [Member]
                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       45       52 45 52 77
Provision for credit losses                 54 72 49
Charge-offs                 (52) (79) (70)
Recoveries                 2 0 0
Net (charge offs) recoveries                 (50) (79) (70)
Allowance on loans transferred to held for sale                     (4)
Other                 0 0 0
Balance at end of period 49       45       49 45 52
Ending balance: collectively evaluated for impairment 47       41       47 41 48
Ending balance: individually evaluated for impairment 2       4       2 4 4
Total allowances for credit losses 49       45       49 45 52
Collectively evaluated for impairment 1,991       2,303       1,991 2,303 2,550
Individually evaluated for impairment 20 [1]       21 [1]       20 [1] 21 [1] 13
Loans carried at the lower of amortized cost or fair value less cost to sell 0       0       0 0 0
Total loans 2,011       2,324       2,011 2,324 2,563
Consumer Loans [Member] | Credit Card [Member]
                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       55       39 55 39 58
Provision for credit losses                 32 67 46
Charge-offs                 (41) (62) (71)
Recoveries                 4 11 12
Net (charge offs) recoveries                 (37) (51) (59)
Allowance on loans transferred to held for sale                     (6)
Other                 0   0
Balance at end of period 50       55       50 55 39
Ending balance: collectively evaluated for impairment 48       50       48 50 32
Ending balance: individually evaluated for impairment 2       5       2 5 7
Total allowances for credit losses 50       55       50 55 39
Collectively evaluated for impairment 846       801       846 801 807
Individually evaluated for impairment 8 [1]       14 [1]       8 [1] 14 [1] 21
Loans carried at the lower of amortized cost or fair value less cost to sell 0       0       0 0 0
Total loans 854 [3]       815       854 [3] 815 828
Consumer Loans [Member] | Other consumer
                      
Allowance for Loan and Lease Losses [Roll Forward]                      
Balance at beginning of period       20       18 20 18 27
Provision for credit losses                 3 21 19
Charge-offs                 (13) (25) (29)
Recoveries                 3 6 4
Net (charge offs) recoveries                 (10) (19) (25)
Allowance on loans transferred to held for sale                     (3)
Other                 0 0 0
Balance at end of period 13       20       13 20 18
Ending balance: collectively evaluated for impairment 13       20       13 20 18
Ending balance: individually evaluated for impairment 0       0       0 0 0
Total allowances for credit losses 13       20       13 20 18
Collectively evaluated for impairment 510       598       510 598 714
Individually evaluated for impairment 0 [1]       0 [1]       0 [1] 0 [1] 0
Loans carried at the lower of amortized cost or fair value less cost to sell 0       0       0 0 0
Total loans $ 510       $ 598       $ 510 $ 598 $ 714
[1] For consumer loans, these amounts represent TDR Loans for which we evaluate reserves using a discounted cash flow methodology. Each loan is individually identified as a TDR Loan and then grouped together with other TDR Loans with similar characteristics. The discounted cash flow analysis is then applied to these groups of TDR Loans. Loans individually evaluated for impairment exclude TDR loans that are carried at the lower of amortized cost or fair value of the collateral less cost to sell which totaled $706 million, $608 million and $303 million at December 31, 2013 , 2012 and 2011, respectively.
[2] Home equity mortgages maturities reflect estimates based on historical payment patterns.
[3] As credit card receivables do not have stated maturities, the table reflects estimates based on historical payment patterns.