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Business Segments - Summary on Reconciliation of Results Under Ifrs to Us Gaap (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Operating Statistics [Line Items]      
Group Reporting Basis Net interest income [1] $ 606 $ 634  
Group Reporting Basis Other operating income 425 574  
Group Reporting Basis Total operating income 1,031 1,208  
Group Reporting Basis Loan impairment charges (61) 232  
Group Reporting Basis Revenues 1,092 976  
Group Reporting Basis Operating expenses [2] 788 729  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 304 247  
Group Reporting Basis Total assets 239,793 253,889  
Group Reporting Basis Total loans, net 70,572 76,849  
Group Reporting Basis Goodwill 1,264 1,264  
Group Reporting Basis Total deposits 95,678 96,900  
Net interest income [1] 597 654  
Other operating income 561 462  
Total operating income 1,158 1,116  
Loan impairment charges (77) 157  
Total income 1,235 959  
Operating expenses [2] 787 726  
Income before income tax 448 233  
Total assets 201,583 [3] 203,784 $ 201,301 [3]
Total loans, net 68,667 80,709 72,858
Goodwill 1,612 1,612 1,612
Total deposits 129,258 126,303 $ 129,248
Group Reporting Basis Adjustments [Member]      
Operating Statistics [Line Items]      
Group Reporting Basis Net interest income [1],[4] (13) (19)  
Group Reporting Basis Other operating income [4] 140 (70)  
Group Reporting Basis Total operating income [4] 127 (89)  
Group Reporting Basis Loan impairment charges [4] (27) (69)  
Group Reporting Basis Revenues [4] 154 (20)  
Group Reporting Basis Operating expenses [2],[4] 10 (6)  
Group Reporting Basis Profit (Loss) Before Income Tax Expense [4] 144 (14)  
Group Reporting Basis Total assets [4] (38,255) (50,109)  
Group Reporting Basis Total loans, net [4] (323) 4  
Group Reporting Basis Goodwill [4] 348 348  
Group Reporting Basis Total deposits [4] (4,430) (5,195)  
Group Reporting Basis Reclassifications [Member]      
Operating Statistics [Line Items]      
Group Reporting Basis Net interest income [1],[5] 4 39  
Group Reporting Basis Other operating income [5] (4) (42)  
Group Reporting Basis Total operating income [5] 0 (3)  
Group Reporting Basis Loan impairment charges [5] 11 (6)  
Group Reporting Basis Revenues [5] (11) 3  
Group Reporting Basis Operating expenses [2],[5] (11) 3  
Group Reporting Basis Profit (Loss) Before Income Tax Expense [5] 0 0  
Group Reporting Basis Total assets [5] 45 4  
Group Reporting Basis Total loans, net [5] (1,582) 3,856  
Group Reporting Basis Goodwill [5] 0 0  
Group Reporting Basis Total deposits [5] 38,010 34,598  
Adjustments/Reconciling Items [Member]      
Operating Statistics [Line Items]      
Group Reporting Basis Net interest income [1] 0 (2)  
Group Reporting Basis Other operating income 0 2  
Group Reporting Basis Total operating income 0 0  
Group Reporting Basis Loan impairment charges 0 0  
Group Reporting Basis Revenues 0 0  
Group Reporting Basis Operating expenses [2] 0 0  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 0 0  
Group Reporting Basis Total assets 0 0  
Group Reporting Basis Total loans, net 0 0  
Group Reporting Basis Goodwill 0 0  
Group Reporting Basis Total deposits 0 0  
RBWM [Member] | Operating Segments [Member]      
Operating Statistics [Line Items]      
Group Reporting Basis Net interest income [1] 213 202  
Group Reporting Basis Other operating income 137 74  
Group Reporting Basis Total operating income 350 276  
Group Reporting Basis Loan impairment charges 9 14  
Group Reporting Basis Revenues 341 262  
Group Reporting Basis Operating expenses [2] 275 253  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 66 9  
Group Reporting Basis Total assets 19,057 20,051  
Group Reporting Basis Total loans, net 16,802 17,033  
Group Reporting Basis Goodwill 581 581  
Group Reporting Basis Total deposits 34,811 32,506  
Increase in segment profit before tax during the three months ended March 31:   3  
CMB [Member] | Operating Segments [Member]      
Operating Statistics [Line Items]      
Group Reporting Basis Net interest income [1] 180 190 [6]  
Group Reporting Basis Other operating income 52 62 [6]  
Group Reporting Basis Total operating income 232 252 [6]  
Group Reporting Basis Loan impairment charges (36) 12 [6]  
Group Reporting Basis Revenues 268 240 [6]  
Group Reporting Basis Operating expenses [2] 139 147 [6]  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 129 93 [6]  
Group Reporting Basis Total assets 24,175 26,877 [6]  
Group Reporting Basis Total loans, net 23,170 23,905 [6]  
Group Reporting Basis Goodwill 358 358 [6]  
Group Reporting Basis Total deposits 19,914 19,699 [6]  
Increase in segment profit before tax during the three months ended March 31:   4  
GBM [Member] | Operating Segments [Member]      
Operating Statistics [Line Items]      
Group Reporting Basis Net interest income [1] 152 149 [6]  
Group Reporting Basis Other operating income 121 260 [6]  
Group Reporting Basis Total operating income 273 409 [6]  
Group Reporting Basis Loan impairment charges (35) 205 [6]  
Group Reporting Basis Revenues 308 204 [6]  
Group Reporting Basis Operating expenses [2] 203 223 [6]  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 105 (19) [6]  
Group Reporting Basis Total assets 84,949 104,090 [6]  
Group Reporting Basis Total loans, net 21,108 25,989 [6]  
Group Reporting Basis Goodwill 0 0 [6]  
Group Reporting Basis Total deposits 22,960 21,942 [6]  
Increase in segment profit before tax during the three months ended March 31:   (8)  
Increase in segment total deposits at March 31:   (8,920)  
PB [Member] | Operating Segments [Member]      
Operating Statistics [Line Items]      
Group Reporting Basis Net interest income [1] 53 51  
Group Reporting Basis Other operating income 21 23  
Group Reporting Basis Total operating income 74 74  
Group Reporting Basis Loan impairment charges 2 (1)  
Group Reporting Basis Revenues 72 75  
Group Reporting Basis Operating expenses [2] 61 58  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 11 17  
Group Reporting Basis Total assets 7,808 8,221  
Group Reporting Basis Total loans, net 5,928 6,461  
Group Reporting Basis Goodwill 325 325  
Group Reporting Basis Total deposits 11,355 13,813  
CC [Member] | Operating Segments [Member]      
Operating Statistics [Line Items]      
Group Reporting Basis Net interest income [1] 8 44  
Group Reporting Basis Other operating income 94 153  
Group Reporting Basis Total operating income 102 197  
Group Reporting Basis Loan impairment charges (1) 2  
Group Reporting Basis Revenues 103 195  
Group Reporting Basis Operating expenses [2] 110 48  
Group Reporting Basis Profit (Loss) Before Income Tax Expense (7) 147  
Group Reporting Basis Total assets 103,804 94,650  
Group Reporting Basis Total loans, net 3,564 3,461  
Group Reporting Basis Goodwill 0 0  
Group Reporting Basis Total deposits $ 6,638 8,940  
Increase in segment profit before tax during the three months ended March 31:   1  
Increase in segment total deposits at March 31:   8,920  
GBM - Portion of Large Corporate Client Group [Member] | Operating Segments [Member]      
Operating Statistics [Line Items]      
Increase in segment profit before tax during the three months ended March 31:   22  
Increase in segment total loans at March 31:   4,733  
Increase in segment total deposits at March 31:   $ 2,789  
[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 Balance Sheet Management and more appropriately reflect the profitability of the segments.
[2] Expenses for the segments include fully apportioned corporate overhead expenses.
[3] The following table summarizes assets and liabilities related to our consolidated variable interest entities ("VIEs") at March 31, 2017 and December 31, 2016 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 24, "Variable Interest Entities," for additional information. Assets: Other assets $220 million and $231 million. Total assets $220 million and $231 million respectively. Liabilities: Long-term debt $79 million and $79 million, Interest, taxes and other liabilities $54 million and $60 million. Total liabilities $133 million and $139 million, respectively.
[4] Represents adjustments associated with differences between U.S. GAAP and the Group Reporting Basis.
[5] Represents differences in financial statement presentation between U.S. GAAP and the Group Reporting Basis.
[6] During the fourth quarter of 2016, we transferred certain client relationships from CMB to GB&M as discussed further in Note 22, "Business Segments," in our 2016 Form 10-K. As a result, we reclassified $22 million of profit before tax from the CMB segment to the GB&M segment during the three months ended March 31, 2016 to conform with the current year presentation. In addition, we reclassified $4,733 million of loans and $2,789 million of deposits from the CMB segment to the GB&M segment at March 31, 2016.