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Business Segments - Summary on Reconciliation of Results Under Ifrs to Us Gaap (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Operating Statistics [Line Items]          
Group Reporting Basis Net interest income [1] $ 607 $ 643 $ 1,213 $ 1,277  
Group Reporting Basis Other operating income 529 325 954 899  
Group Reporting Basis Total operating income 1,136 968 2,167 2,176  
Group Reporting Basis Loan impairment charges (9) 177 (70) 409  
Group Reporting Basis Revenues 1,145 791 2,237 1,767  
Group Reporting Basis Operating expenses [2] 835 805 1,623 1,534  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 310 (14) 614 233  
Group Reporting Basis Total assets 228,982 262,583 228,982 262,583  
Group Reporting Basis Total loans, net 68,495 75,158 68,495 75,158  
Group Reporting Basis Goodwill 1,264 1,264 1,264 1,264  
Group Reporting Basis Total deposits 94,421 97,802 94,421 97,802  
Net interest income [1] 582 638 1,179 1,292  
Other operating income 529 293 1,090 755  
Total operating income 1,111 931 2,269 2,047  
Loan impairment charges (21) 134 (98) 291  
Total income 1,132 797 2,367 1,756  
Operating expenses [2] 820 823 1,607 1,549  
Income (loss) before income tax 312 (26) 760 207  
Total assets 193,350 [3] 210,873 193,350 [3] 210,873 $ 201,301 [3]
Total loans, net 67,215 78,747 67,215 78,747 72,858
Goodwill 1,612 1,612 1,612 1,612 1,612
Total deposits 117,143 132,819 117,143 132,819 $ 129,248
Group Reporting Basis Adjustments [Member]          
Operating Statistics [Line Items]          
Group Reporting Basis Net interest income [1],[4] (16) (22) (29) (41)  
Group Reporting Basis Other operating income [4] (11) (14) 129 (84)  
Group Reporting Basis Total operating income [4] (27) (36) 100 (125)  
Group Reporting Basis Loan impairment charges [4] (21) (19) (48) (88)  
Group Reporting Basis Revenues [4] (6) (17) 148 (37)  
Group Reporting Basis Operating expenses [2],[4] (8) (5) 2 (11)  
Group Reporting Basis Profit (Loss) Before Income Tax Expense [4] 2 (12) 146 (26)  
Group Reporting Basis Total assets [4] (35,632) (51,717) (35,632) (51,717)  
Group Reporting Basis Total loans, net [4] (1,035) (192) (1,035) (192)  
Group Reporting Basis Goodwill [4] 348 348 348 348  
Group Reporting Basis Total deposits [4] (3,849) (4,994) (3,849) (4,994)  
Group Reporting Basis Reclassifications [Member]          
Operating Statistics [Line Items]          
Group Reporting Basis Net interest income [1],[5] (9) 17 (5) 56  
Group Reporting Basis Other operating income [5] 11 (18) 7 (60)  
Group Reporting Basis Total operating income [5] 2 (1) 2 (4)  
Group Reporting Basis Loan impairment charges [5] 9 (24) 20 (30)  
Group Reporting Basis Revenues [5] (7) 23 (18) 26  
Group Reporting Basis Operating expenses [2],[5] (7) 23 (18) 26  
Group Reporting Basis Profit (Loss) Before Income Tax Expense [5] 0 0 0 0  
Group Reporting Basis Total assets [5] 0 7 0 7  
Group Reporting Basis Total loans, net [5] (245) 3,781 (245) 3,781  
Group Reporting Basis Goodwill [5] 0 0 0 0  
Group Reporting Basis Total deposits [5] 26,571 40,011 26,571 40,011  
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] 221 205 434 407  
Group Reporting Basis Other operating income 225 71 362 145  
Group Reporting Basis Total operating income 446 276 796 552  
Group Reporting Basis Loan impairment charges (3) 13 6 27  
Group Reporting Basis Revenues 449 263 790 525  
Group Reporting Basis Operating expenses [2] 274 262 549 515  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 175 1 241 10  
Group Reporting Basis Total assets 18,960 20,254 18,960 20,254  
Group Reporting Basis Total loans, net 16,709 17,151 16,709 17,151  
Group Reporting Basis Goodwill 581 581 581 581  
Group Reporting Basis Total deposits 34,868 31,854 34,868 31,854  
Increase in segment profit before tax during the three months ended June 30:   (3)   0  
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] 181 185 361 375 [6]  
Group Reporting Basis Other operating income 52 55 104 117 [6]  
Group Reporting Basis Total operating income 233 240 465 492 [6]  
Group Reporting Basis Loan impairment charges (5) 19 (41) 31 [6]  
Group Reporting Basis Revenues 238 221 506 461 [6]  
Group Reporting Basis Operating expenses [2] 141 153 280 300 [6]  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 97 68 226 161 [6]  
Group Reporting Basis Total assets 23,515 25,882 [6] 23,515 25,882 [6]  
Group Reporting Basis Total loans, net 22,335 24,667 [6] 22,335 24,667 [6]  
Group Reporting Basis Goodwill 358 358 [6] 358 358 [6]  
Group Reporting Basis Total deposits 20,799 20,843 [6] 20,799 20,843 [6]  
Increase in segment profit before tax during the three months ended June 30:   2   6  
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] 156 158 308 307 [6]  
Group Reporting Basis Other operating income 153 155 274 415 [6]  
Group Reporting Basis Total operating income 309 313 582 722 [6]  
Group Reporting Basis Loan impairment charges (2) 149 (37) 354 [6]  
Group Reporting Basis Revenues 311 164 619 368 [6]  
Group Reporting Basis Operating expenses [2] 232 246 435 469 [6]  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 79 (82) 184 (101) [6]  
Group Reporting Basis Total assets 80,426 97,092 [6] 80,426 97,092 [6]  
Group Reporting Basis Total loans, net 19,805 24,980 [6] 19,805 24,980 [6]  
Group Reporting Basis Goodwill 0 0 [6] 0 0 [6]  
Group Reporting Basis Total deposits 20,920 22,991 [6] 20,920 22,991 [6]  
Increase in segment profit before tax during the three months ended June 30:   (73)   (81)  
Increase in segment total deposits at June 30:       (8,444)  
PB [Member] | Operating Segments [Member]          
Operating Statistics [Line Items]          
Group Reporting Basis Net interest income [1] 56 49 109 100  
Group Reporting Basis Other operating income 21 22 42 45  
Group Reporting Basis Total operating income 77 71 151 145  
Group Reporting Basis Loan impairment charges 1 0 3 (1)  
Group Reporting Basis Revenues 76 71 148 146  
Group Reporting Basis Operating expenses [2] 63 59 124 117  
Group Reporting Basis Profit (Loss) Before Income Tax Expense 13 12 24 29  
Group Reporting Basis Total assets 8,131 8,244 8,131 8,244  
Group Reporting Basis Total loans, net 6,354 6,555 6,354 6,555  
Group Reporting Basis Goodwill 325 325 325 325  
Group Reporting Basis Total deposits 10,262 13,670 10,262 13,670  
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] (7) 46 1 90  
Group Reporting Basis Other operating income 78 22 172 175  
Group Reporting Basis Total operating income 71 68 173 265  
Group Reporting Basis Loan impairment charges 0 (4) (1) (2)  
Group Reporting Basis Revenues 71 72 174 267  
Group Reporting Basis Operating expenses [2] 125 85 235 133  
Group Reporting Basis Profit (Loss) Before Income Tax Expense (54) (13) (61) 134  
Group Reporting Basis Total assets 97,950 111,111 97,950 111,111  
Group Reporting Basis Total loans, net 3,292 1,805 3,292 1,805  
Group Reporting Basis Goodwill 0 0 0 0  
Group Reporting Basis Total deposits $ 7,572 8,444 $ 7,572 8,444  
Increase in segment profit before tax during the three months ended June 30:   74   75  
Increase in segment total deposits at June 30:       8,444  
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:   $ 22   44  
Increase in segment total loans at June 30:       4,358  
Increase in segment total deposits at June 30:       $ 2,842  
[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 June 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 15, "Variable Interest Entities," for additional information. Assets: Other assets $209 million and $231 million. Total assets $209 million and $231 million respectively. Liabilities: Long-term debt $73 million and $79 million, Interest, taxes and other liabilities $55 million and $60 million. Total liabilities $128 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 and $44 million of profit before tax from the CMB segment to the GB&M segment during the three and six months ended June 30, 2016, respectively, to conform with the current year presentation. In addition, we reclassified $4,358 million of loans and $2,842 million of deposits from the CMB segment to the GB&M segment at June 30, 2016.