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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, 2014
Mar. 31, 2013
Dec. 31, 2013
Operating Statistics [Line Items]      
US GAAP Based, Net interest income $ 519 [1] $ 505 [1]  
US GAAP Based, Other operating income 500 592  
US GAAP Based, Total operating income 1,019 1,097  
Provision (credit) for credit losses 16 [2] 21 [2]  
US GAAP Based, Operating income, net 1,003 1,076  
US GAAP Based, Operating expenses 750 [3] 768 [3]  
Income before income tax expense 253 308  
Total assets 187,174 [4] 189,385 185,487 [4]
US GAAP Based, Total loans, net 68,323 62,364 67,089
US GAAP Based, Goodwill 1,612 2,228 1,612
US GAAP Based, Total deposits 105,531 117,049 112,608
Adjustments Or Reconciling Items [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income (5) [1] (4) [1]  
IFRS Based, Other operating income 5 4  
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  
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 513 [1] 521 [1]  
IFRS Based, Other operating income 530 569  
IFRS Based, Total operating income 1,043 1,090  
IFRS Loan Impairment charges 19 [2] 50 [2]  
IFRS Based, Operating income, net 1,024 1,040  
IFRS Based Operating expenses 756 [3] 764 [3]  
IFRS Based, Profit before income tax expense 268 276  
Total Assets 235,236 252,708  
IFRS Based, Total loans, net 64,193 58,981  
IFRS Based, Goodwill 1,264 1,744  
IFRS Based, Total deposits 94,115 101,134  
Ifrs Adjustments [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income (15) [1],[5] (17) [1],[5]  
IFRS Based, Other operating income (4) [5] 26 [5]  
IFRS Based, Total operating income (19) [5] 9 [5]  
IFRS Loan Impairment charges 4 [2],[5] (23) [2],[5]  
IFRS Based, Operating income, net (23) [5] 32 [5]  
IFRS Based Operating expenses (8) [3],[5] 0 [3],[5]  
IFRS Based, Profit before income tax expense (15) [5] 32 [5]  
Total Assets (47,888) [5] (63,415) [5]  
IFRS Based, Total loans, net 1,411 [5] 1,194 [5]  
IFRS Based, Goodwill 348 [5] 484 [5]  
IFRS Based, Total deposits (3,247) [5] (5,319) [5]  
Ifrs Reclassifications [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income 21 [1],[6] 1 [1],[6]  
IFRS Based, Other operating income (26) [6] (3) [6]  
IFRS Based, Total operating income (5) [6] (2) [6]  
IFRS Loan Impairment charges (7) [2],[6] (6) [2],[6]  
IFRS Based, Operating income, net 2 [6] 4 [6]  
IFRS Based Operating expenses 2 [3],[6] 4 [3],[6]  
IFRS Based, Profit before income tax expense 0 [6] 0 [6]  
Total Assets (174) [6] 92 [6]  
IFRS Based, Total loans, net 2,719 [6] 2,189 [6]  
IFRS Based, Goodwill 0 [6] 0 [6]  
IFRS Based, Total deposits 14,663 [6] 21,234 [6]  
RBWM [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income 198 [1] 215 [1]  
IFRS Based, Other operating income 113 107  
IFRS Based, Total operating income 311 322  
IFRS Loan Impairment charges 2 [2] 32 [2]  
IFRS Based, Operating income, net 309 290  
IFRS Based Operating expenses 279 [3] 291 [3]  
IFRS Based, Profit before income tax expense 30 (1)  
Total Assets 19,143 19,634  
IFRS Based, Total loans, net 16,177 16,747  
IFRS Based, Goodwill 581 581  
IFRS Based, Total deposits 30,206 34,253  
CMB [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income 187 [1] 170 [1]  
IFRS Based, Other operating income 68 65  
IFRS Based, Total operating income 255 235  
IFRS Loan Impairment charges 7 [2] 14 [2]  
IFRS Based, Operating income, net 248 221  
IFRS Based Operating expenses 158 [3] 162 [3]  
IFRS Based, Profit before income tax expense 90 59  
Total Assets 25,594 20,919  
IFRS Based, Total loans, net 24,509 19,449  
IFRS Based, Goodwill 358 358  
IFRS Based, Total deposits 21,254 21,464  
PB [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income 49 [1] 45 [1]  
IFRS Based, Other operating income 25 28  
IFRS Based, Total operating income 74 73  
IFRS Loan Impairment charges (5) [2] 1 [2]  
IFRS Based, Operating income, net 79 72  
IFRS Based Operating expenses 55 [3] 60 [3]  
IFRS Based, Profit before income tax expense 24 12  
Total Assets 8,231 7,831  
IFRS Based, Total loans, net 6,022 5,722  
IFRS Based, Goodwill 325 325  
IFRS Based, Total deposits 12,529 12,941  
GBM [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income 97 [1] 109 [1]  
IFRS Based, Other operating income 294 382  
IFRS Based, Total operating income 391 491  
IFRS Loan Impairment charges 15 [2] 3 [2]  
IFRS Based, Operating income, net 376 488  
IFRS Based Operating expenses 239 [3] 230 [3]  
IFRS Based, Profit before income tax expense 137 258  
Total Assets 181,545 204,160  
IFRS Based, Total loans, net 17,485 17,063  
IFRS Based, Goodwill 0 480  
IFRS Based, Total deposits 30,126 32,476  
Other [Member]
      
Operating Statistics [Line Items]      
IFRS Based, Net Interest Income (13) [1] (14) [1]  
IFRS Based, Other operating income 25 (17)  
IFRS Based, Total operating income 12 (31)  
IFRS Loan Impairment charges 0 [2] 0 [2]  
IFRS Based, Operating income, net 12 (31)  
IFRS Based Operating expenses 25 [3] 21 [3]  
IFRS Based, Profit before income tax expense (13) (52)  
Total Assets 723 164  
IFRS Based, Total loans, net 0 0  
IFRS Based, Goodwill 0 0  
IFRS Based, Total deposits $ 0 $ 0  
[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 segments.
[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 March 31, 2014 and December 31, 2013 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation. Assets: Interest bearing deposits with banks, $3 million and $5 million, Securities held-to-maturity, $180 million and $200 million Other assets $479 million and $502 million. Total assets $662 million and $707 million respectively. Liabilities: Long-term debt $92 million and $92 million, Interest, taxes and other liabilities $80 million and $93 million. Total liabilities $172 million and $185 million, respectively.
[5] Represents adjustments associated with differences between IFRSs and U.S. GAAP bases of accounting.
[6] resents differences in financial statement presentation between IFRSs and U.S. GAAP.