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Loans - Average Balance and Interest Income Recognized on Impaired Commercial Loans (Detail) - Commercial Loans [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Financing Receivable, Impaired [Line Items]        
Total average balance of impaired commercial loans $ 894 $ 1,194 $ 943 $ 888
Total interest income recognized on impaired commercial loans 2 5 8 11
Real Estate, Including Construction [Member]        
Financing Receivable, Impaired [Line Items]        
Total average balance of impaired commercial loans 30 79 37 93
Total interest income recognized on impaired commercial loans 0 2 0 3
Business and Corporate Banking [Member]        
Financing Receivable, Impaired [Line Items]        
Total average balance of impaired commercial loans 302 428 318 345
Total interest income recognized on impaired commercial loans 1 3 6 8
Global Banking [Member]        
Financing Receivable, Impaired [Line Items]        
Total average balance of impaired commercial loans 559 679 583 443
Total interest income recognized on impaired commercial loans 1 0 2 0
Other Commercial [Member]        
Financing Receivable, Impaired [Line Items]        
Total average balance of impaired commercial loans $ 3 $ 8 $ 5 $ 7