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Loans - Impaired Commercial Loans Considered as TDR Loans (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
TDR Loans [1],[2],[3] $ 1,254 $ 1,453
Commercial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Amount with Impairment Reserves [4] 761 171
Amount without Impairment Reserves [4] 374 282
Total Impaired Commercial Loans [4],[5] 1,135 453
Impairment Reserve 342 54
Unpaid principal balance of impaired commercial loans 1,188 519
TDR Loans [2],[3],[6] 521 365
Commercial Loans [Member] | Construction and Other Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Amount with Impairment Reserves [4] 6 2
Amount without Impairment Reserves [4] 53 108
Total Impaired Commercial Loans [4],[5] 59 110
Impairment Reserve 2 1
Unpaid principal balance of impaired commercial loans 62 125
TDR Loans [2],[3] 45 94
Commercial Loans [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Impaired [Line Items]    
Amount with Impairment Reserves [4] 204 168
Amount without Impairment Reserves [4] 243 124
Total Impaired Commercial Loans [4],[5] 447 292
Impairment Reserve 68 52
Unpaid principal balance of impaired commercial loans 482 342
TDR Loans [2],[3] 404 227
Commercial Loans [Member] | Global Banking [Member]    
Financing Receivable, Impaired [Line Items]    
Amount with Impairment Reserves [4] 550 0
Amount without Impairment Reserves [4] 72 44
Total Impaired Commercial Loans [4],[5] 622 44
Impairment Reserve 271 0
Unpaid principal balance of impaired commercial loans 636 44
TDR Loans [2],[3] 72 44
Commercial Loans [Member] | Other Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Amount with Impairment Reserves [4] 1 1
Amount without Impairment Reserves [4] 6 6
Total Impaired Commercial Loans [4],[5] 7 7
Impairment Reserve 1 1
Unpaid principal balance of impaired commercial loans $ 8 $ 8
[1] At September 30, 2016 and December 31, 2015, the carrying value of TDR Loans includes $610 million and $676 million, respectively, of loans which are classified as nonaccrual.
[2] TDR Loans are considered to be impaired loans. For consumer loans, all such loans are considered impaired loans regardless of accrual status. For commercial loans, impaired loans include other loans in addition to TDR Loans which totaled $614 million and $88 million at September 30, 2016 and December 31, 2015, respectively.
[3] The carrying value of TDR Loans includes basis adjustments on the loans, such as unearned income, unamortized deferred fees and costs on originated loans, partial charge-offs and premiums or discounts on purchased loans.
[4] Reflects the carrying value of impaired commercial loans and includes basis adjustments on the loans, such as partial charge-offs, unamortized deferred fees and costs on originated loans and any premiums or discounts on purchased loans.
[5] Includes impaired commercial loans that are also considered TDR Loans which totaled $521 million and $365 million at September 30, 2016 and December 31, 2015, respectively.
[6] Additional commitments to lend to commercial borrowers whose loans have been modified in TDRs totaled $205 million and $112 million at September 30, 2016 and December 31, 2015, respectively.