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Business Segments - Summary on Reconciliation of Results Under Ifrs to Us Gaap (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Operating Statistics [Line Items]          
Group Reporting Basis Net interest income [1] $ 595 $ 608 $ 1,808 $ 1,885  
Group Reporting Basis Other operating income 284 357 1,238 1,256  
Group Reporting Basis Total operating income 879 965 3,046 3,141  
Group Reporting Basis Loan impairment charges (16) 42 (86) 451  
Group Reporting Basis Revenues 895 923 3,132 2,690  
Group Reporting Basis Operating expenses [2] 793 814 2,416 2,348  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 102 109 716 342  
Group Reporting Basis Total assets 231,847 253,974 231,847 253,974  
Group Reporting Basis Total loans, net 68,234 73,630 68,234 73,630  
Group Reporting Basis Goodwill 1,260 1,264 1,260 1,264  
Group Reporting Basis Total deposits 97,953 99,995 97,953 99,995  
Net interest income [1] 560 604 1,739 1,896  
Other operating income 368 320 1,458 1,075  
Total operating income 928 924 3,197 2,971  
Loan impairment charges (22) 62 (120) 353  
Total income 950 862 3,317 2,618  
Operating expenses [2] 795 803 2,402 2,352  
Income before income tax 155 59 915 266  
Total assets 197,886 [3] 208,310 197,886 [3] 208,310 $ 201,301 [3]
Total loans, net 66,794 76,565 66,794 76,565 72,858
Goodwill 1,607 1,612 1,607 1,612 1,612
Total deposits 121,840 131,082 121,840 131,082 $ 129,248
Group Reporting Basis Adjustments [Member]          
Operating Statistics [Line Items]          
Group Reporting Basis Net interest income [1],[4] (9) (18) (38) (59)  
Group Reporting Basis Other operating income [4] 61 (27) 190 (111)  
Group Reporting Basis Total operating income [4] 52 (45) 152 (170)  
Group Reporting Basis Loan impairment charges [4] 1 16 (47) (72)  
Group Reporting Basis Revenues [4] 51 (61) 199 (98)  
Group Reporting Basis Operating expenses [2],[4] (2) (11) 0 (22)  
Group Reporting Basis Profit (Loss) Before Income Tax Expense [4] 53 (50) 199 (76)  
Group Reporting Basis Total assets [4] (33,961) (45,673) (33,961) (45,673)  
Group Reporting Basis Total loans, net [4] (1,039) (447) (1,039) (447)  
Group Reporting Basis Goodwill [4] 347 348 347 348  
Group Reporting Basis Total deposits [4] (3,874) (4,919) (3,874) (4,919)  
Group Reporting Basis Reclassifications [Member]          
Operating Statistics [Line Items]          
Group Reporting Basis Net interest income [1],[5] (26) 14 (31) 70  
Group Reporting Basis Other operating income [5] 23 (10) 30 (70)  
Group Reporting Basis Total operating income [5] (3) 4 (1) 0  
Group Reporting Basis Loan impairment charges [5] (7) 4 13 (26)  
Group Reporting Basis Revenues [5] 4 0 (14) 26  
Group Reporting Basis Operating expenses [2],[5] 4 0 (14) 26  
Group Reporting Basis Profit (Loss) Before Income Tax Expense [5] 0 0 0 0  
Group Reporting Basis Total assets [5] 0 9 0 9  
Group Reporting Basis Total loans, net [5] (401) 3,382 (401) 3,382  
Group Reporting Basis Goodwill [5] 0 0 0 0  
Group Reporting Basis Total deposits [5] 27,761 36,006 27,761 36,006  
Adjustments/Reconciling Items [Member]          
Operating Statistics [Line Items]          
Group Reporting Basis Net interest income [1] 0 0 0 (2)  
Group Reporting Basis Other operating income 0 0 0 2  
Group Reporting Basis Total operating income 0 0 0 0  
Group Reporting Basis Loan impairment charges 0 0 0 0  
Group Reporting Basis Revenues 0 0 0 0  
Group Reporting Basis Operating expenses [2] 0 0 0 0  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 0 0 0 0  
Group Reporting Basis Total assets 0 0 0 0  
Group Reporting Basis Total loans, net 0 0 0 0  
Group Reporting Basis Goodwill 0 0 0 0  
Group Reporting Basis Total deposits 0 0 0 0  
RBWM [Member] | Operating Segments [Member]          
Operating Statistics [Line Items]          
Group Reporting Basis Net interest income [1] 231 206 665 613  
Group Reporting Basis Other operating income 54 69 416 214  
Group Reporting Basis Total operating income 285 275 1,081 827  
Group Reporting Basis Loan impairment charges 11 30 17 57  
Group Reporting Basis Revenues 274 245 1,064 770  
Group Reporting Basis Operating expenses [2] 281 278 830 793  
Group Reporting Basis Profit (Loss) Before Income Tax Expense (7) (33) 234 (23)  
Group Reporting Basis Total assets 18,968 20,108 18,968 20,108  
Group Reporting Basis Total loans, net 16,781 17,116 16,781 17,116  
Group Reporting Basis Goodwill 581 581 581 581  
Group Reporting Basis Total deposits 34,275 31,702 34,275 31,702  
Increase in segment profit before tax during the three months ended June 30:   1   1  
Increase in segment total deposits at June 30:       0  
CMB [Member] | Operating Segments [Member]          
Operating Statistics [Line Items]          
Group Reporting Basis Net interest income [1] 187 187 548 562 [6]  
Group Reporting Basis Other operating income 55 49 159 166 [6]  
Group Reporting Basis Total operating income 242 236 707 728 [6]  
Group Reporting Basis Loan impairment charges (8) (18) (49) 13 [6]  
Group Reporting Basis Revenues 250 254 756 715 [6]  
Group Reporting Basis Operating expenses [2] 142 151 422 451 [6]  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 108 103 334 264 [6]  
Group Reporting Basis Total assets 24,154 25,262 [6] 24,154 25,262 [6]  
Group Reporting Basis Total loans, net 22,959 24,170 [6] 22,959 24,170 [6]  
Group Reporting Basis Goodwill 358 358 [6] 358 358 [6]  
Group Reporting Basis Total deposits 23,919 21,858 [6] 23,919 21,858 [6]  
Increase in segment profit before tax during the three months ended June 30:   3   9  
Increase in segment total deposits at June 30:       0  
GBM [Member] | Operating Segments [Member]          
Operating Statistics [Line Items]          
Group Reporting Basis Net interest income [1] 131 133 439 440 [6]  
Group Reporting Basis Other operating income 111 183 385 598 [6]  
Group Reporting Basis Total operating income 242 316 824 1,038 [6]  
Group Reporting Basis Loan impairment charges (18) 31 (55) 385 [6]  
Group Reporting Basis Revenues 260 285 879 653 [6]  
Group Reporting Basis Operating expenses [2] 200 242 635 711 [6]  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 60 43 244 (58) [6]  
Group Reporting Basis Total assets 90,779 92,055 [6] 90,779 92,055 [6]  
Group Reporting Basis Total loans, net 18,843 24,065 [6] 18,843 24,065 [6]  
Group Reporting Basis Goodwill 0 0 [6] 0 0 [6]  
Group Reporting Basis Total deposits 21,628 26,547 [6] 21,628 26,547 [6]  
Increase in segment profit before tax during the three months ended June 30:   (50)   (131)  
Increase in segment total deposits at June 30:       (6,672)  
PB [Member] | Operating Segments [Member]          
Operating Statistics [Line Items]          
Group Reporting Basis Net interest income [1] 56 53 165 153  
Group Reporting Basis Other operating income 31 22 73 67  
Group Reporting Basis Total operating income 87 75 238 220  
Group Reporting Basis Loan impairment charges (2) 1 1 0  
Group Reporting Basis Revenues 89 74 237 220  
Group Reporting Basis Operating expenses [2] 67 56 191 173  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 22 18 46 47  
Group Reporting Basis Total assets 7,684 8,149 7,684 8,149  
Group Reporting Basis Total loans, net 5,900 6,433 5,900 6,433  
Group Reporting Basis Goodwill 321 325 321 325  
Group Reporting Basis Total deposits 9,737 13,216 9,737 13,216  
Increase in segment profit before tax during the three months ended June 30:   0   0  
Increase in segment total deposits at June 30:       0  
CC [Member] | Operating Segments [Member]          
Operating Statistics [Line Items]          
Group Reporting Basis Net interest income [1] (10) 29 (9) 119  
Group Reporting Basis Other operating income 33 34 205 209  
Group Reporting Basis Total operating income 23 63 196 328  
Group Reporting Basis Loan impairment charges 1 (2) 0 (4)  
Group Reporting Basis Revenues 22 65 196 332  
Group Reporting Basis Operating expenses [2] 103 87 338 220  
Group Reporting Basis Profit (Loss) Before Income Tax Expense (81) (22) (142) 112  
Group Reporting Basis Total assets 90,262 108,400 90,262 108,400  
Group Reporting Basis Total loans, net 3,751 1,846 3,751 1,846  
Group Reporting Basis Goodwill 0 0 0 0  
Group Reporting Basis Total deposits $ 8,394 6,672 $ 8,394 6,672  
Increase in segment profit before tax during the three months ended June 30:   46   121  
Increase in segment total deposits at June 30:       6,672  
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 June 30:   $ 23   67  
Increase in segment total loans at June 30:       3,570  
Increase in segment total deposits at June 30:       $ 3,068  
[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 September 30, 2017 and December 31, 2016 which are consolidated on our balance sheet. Assets and liabilities exclude intercompany balances that eliminate in consolidation. See Note 16, "Variable Interest Entities," for additional information. Assets: Other assets $208 million and $231 million. Total assets $208 million and $231 million respectively. Liabilities: Long-term debt $73 million and $79 million, Interest, taxes and other liabilities $58 million and $60 million. Total liabilities $131 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 $23 million and $67 million of profit before tax from the CMB segment to the GB&M segment during the three and nine months ended September 30, 2016, respectively, to conform with the current year presentation. In addition, we reclassified $3,570 million of loans and $3,068 million of deposits from the CMB segment to the GB&M segment at September 30, 2016