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Business Segments - Summary on Reconciliation of Results Under Ifrs to Us Gaap (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Operating Statistics [Line Items]      
US GAAP Based, Net interest income $ 505 [1] $ 587 [1]  
US GAAP Based, Other operating income 592 367  
US GAAP Based, Total operating income 1,097 954  
US GAAP Based, Loan impairment charges 21 [2] 0 [2]  
US GAAP Based, Operating income, net 1,076 954  
US GAAP Based, Operating expenses 789 [3] 856 [3]  
Income from continuing operations before income tax expense 287 98  
Total assets 193,010 [4] 191,332 196,567 [4]
US GAAP Based, Total loans, net 62,364 53,266 62,611
US GAAP Based, Goodwill 2,228 2,228 2,228
US GAAP Based, Total deposits 117,049 137,527 117,671
RBWM [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income 215 [1] 247 [1]  
IFRS Based, Other operating income 107 97  
IFRS Based, Total operating income 322 344  
IFRS Loan Impairment charges 32 [2] 41 [2]  
IFRS Based,operating income, net 290 303  
IFRS Based Operating expenses 291 [3] 321 [3]  
IFRS Based, Profit before income tax expense (1) (18)  
IFRS Based, Total assets 19,634 27,570  
IFRS Based, Total loans, net 16,747 16,093  
IFRS Based, Goodwill 581 581  
IFRS Based, Total deposits 34,253 37,758  
CMB [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income 170 [1] 170 [1]  
IFRS Based, Other operating income 65 68  
IFRS Based, Total operating income 235 238  
IFRS Loan Impairment charges 14 [2] (17) [2]  
IFRS Based,operating income, net 221 255  
IFRS Based Operating expenses 162 [3] 164 [3]  
IFRS Based, Profit before income tax expense 59 91  
IFRS Based, Total assets 20,919 22,633  
IFRS Based, Total loans, net 19,449 17,450  
IFRS Based, Goodwill 358 358  
IFRS Based, Total deposits 21,464 21,219  
GBM [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income 109 [1] 143 [1]  
IFRS Based, Other operating income 382 326  
IFRS Based, Total operating income 491 469  
IFRS Loan Impairment charges 3 [2] (31) [2]  
IFRS Based,operating income, net 488 500  
IFRS Based Operating expenses 230 [3] 259 [3]  
IFRS Based, Profit before income tax expense 258 241  
IFRS Based, Total assets 207,785 199,218  
IFRS Based, Total loans, net 23,244 27,665  
IFRS Based, Goodwill 480 480  
IFRS Based, Total deposits 36,135 40,461  
PB [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income 45 [1] 45 [1]  
IFRS Based, Other operating income 28 29  
IFRS Based, Total operating income 73 74  
IFRS Loan Impairment charges 1 [2] (2) [2]  
IFRS Based,operating income, net 72 76  
IFRS Based Operating expenses 60 [3] 58 [3]  
IFRS Based, Profit before income tax expense 12 18  
IFRS Based, Total assets 7,831 6,931  
IFRS Based, Total loans, net 5,722 4,962  
IFRS Based, Goodwill 325 325  
IFRS Based, Total deposits 12,941 12,033  
Other [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income (14) [1] (11) [1]  
IFRS Based, Other operating income (25) (235)  
IFRS Based, Total operating income (39) (246)  
IFRS Loan Impairment charges 0 [2] 0 [2]  
IFRS Based,operating income, net (39) (246)  
IFRS Based Operating expenses 42 [3] 40 [3]  
IFRS Based, Profit before income tax expense (81) (286)  
IFRS Based, Total assets 164 624  
IFRS Based, Total loans, net 0 0  
IFRS Based, Goodwill 0 0  
IFRS Based, Total deposits 0 0  
Adjustments Or Reconciling Items [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income (4) [1] (6) [1]  
IFRS Based, Other operating income 4 6  
IFRS Based, Total operating income 0 0  
IFRS Loan Impairment charges 0 [2] 0 [2]  
IFRS Based,operating income, net 0 0  
IFRS Based Operating expenses 0 [3] 0 [3]  
IFRS Based, Profit before income tax expense 0 0  
IFRS Based, Total assets 0 0  
IFRS Based, Total loans, net 0 0  
IFRS Based, Goodwill 0 0  
IFRS Based, Total deposits 0 0  
Aggregate [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income 521 [1] 588 [1]  
IFRS Based, Other operating income 561 291  
IFRS Based, Total operating income 1,082 879  
IFRS Loan Impairment charges 50 [2] (9) [2]  
IFRS Based,operating income, net 1,032 888  
IFRS Based Operating expenses 785 [3] 842 [3]  
IFRS Based, Profit before income tax expense 247 46  
IFRS Based, Total assets 256,333 256,976  
IFRS Based, Total loans, net 65,162 66,170  
IFRS Based, Goodwill 1,744 1,744  
IFRS Based, Total deposits 104,793 111,471  
IFRS Adjustments [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income (17) [1],[5] (15) [1],[5]  
IFRS Based, Other operating income 34 [5] 68 [5]  
IFRS Based, Total operating income 17 [5] 53 [5]  
IFRS Loan Impairment charges (23) [2],[5] (3) [2],[5]  
IFRS Based,operating income, net 40 [5] 56 [5]  
IFRS Based Operating expenses 0 [3],[5] 4 [3],[5]  
IFRS Based, Profit before income tax expense 40 [5] 52 [5]  
IFRS Based, Total assets (63,415) [5] (65,781) [5]  
IFRS Based, Total loans, net 1,194 [5] (2,677) [5]  
IFRS Based, Goodwill 484 [5] 484 [5]  
IFRS Based, Total deposits (5,319) [5] (4,441) [5]  
IFRS Reclassifications [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income 1 [1],[6] 14 [1],[6]  
IFRS Based, Other operating income (3) [6] 8 [6]  
IFRS Based, Total operating income (2) [6] 22 [6]  
IFRS Loan Impairment charges (6) [2],[6] 12 [2],[6]  
IFRS Based,operating income, net 4 [6] 10 [6]  
IFRS Based Operating expenses 4 [3],[6] 10 [3],[6]  
IFRS Based, Profit before income tax expense 0 [6] 0 [6]  
IFRS Based, Total assets 92 [6] 137 [6]  
IFRS Based, Total loans, net (3,992) [6] (10,227) [6]  
IFRS Based, Goodwill 0 [6] 0 [6]  
IFRS Based, Total deposits $ 17,575 [6] $ 30,497 [6]  
[1] Net interest income of each segment represents the difference between actual interest earned on assets and interest paid on liabilities of the segment adjusted for a funding charge or credit. Segments are charged a cost to fund assets (e.g. customer loans) and receive a funding credit for funds provided (e.g. customer deposits) based on equivalent market rates. The objective of these charges/credits is to transfer interest rate risk from the segments to one centralized unit in Treasury and more appropriately reflect the profitability of segmen
[2] The provision assigned to the segments is based on the segments’ net charge offs and the change in allowance for credit losses.
[3] Expenses for the segments include fully apportioned corporate overhead expenses.
[4] The following table summarizes assets and liabilities related to our consolidated variable interest entities (“VIEs”) as of December 31, 2012 and 2011 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation. Assets: Interest bearing deposits with banks, $216 and $108, Other assets $533 and $520, Total assets $749 and $628 respectively. Liabilities: Long-term debt $92 and $55, Interest, taxes and other liabilities $152 and $166, Liabilities of discontinued operations $0 and $541, Total liabilities $244 and $762, respectively.
[5] Represents adjustments associated with differences between IFRSs and U.S. GAAP bases of accounting.
[6] Represents differences in financial statement presentation between IFRSs and U.S. GAAP.