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Loans - Trouble Debt Restructuring Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Modifications [Line Items]      
Average balance of TDR loans $ 1,158 $ 1,252 $ 1,300
Interest income recognized on TDR loans 39 39 45
Commercial Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Average balance of TDR loans 419 482 256
Interest income recognized on TDR loans 9 13 7
Commercial Loans [Member] | Real Estate, Including Construction [Member]      
Financing Receivable, Modifications [Line Items]      
Average balance of TDR loans 19 69 136
Interest income recognized on TDR loans 0 4 4
Commercial Loans [Member] | Business and Corporate Banking [Member]      
Financing Receivable, Modifications [Line Items]      
Average balance of TDR loans 246 292 76
Interest income recognized on TDR loans 7 8 3
Commercial Loans [Member] | Global Banking [Member]      
Financing Receivable, Modifications [Line Items]      
Average balance of TDR loans 154 121 44
Interest income recognized on TDR loans 2 1 0
Consumer Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Average balance of TDR loans 739 770 1,044
Interest income recognized on TDR loans 30 26 38
Consumer Loans [Member] | Residential Mortgage [Member]      
Financing Receivable, Modifications [Line Items]      
Average balance of TDR loans 704 740 1,017
Interest income recognized on TDR loans 28 25 37
Consumer Loans [Member] | Home Equity Mortgages [Member]      
Financing Receivable, Modifications [Line Items]      
Average balance of TDR loans 31 25 21
Interest income recognized on TDR loans 2 1 1
Consumer Loans [Member] | Credit Cards [Member]      
Financing Receivable, Modifications [Line Items]      
Average balance of TDR loans $ 4 $ 5 $ 6