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Loans - Trouble Debt Restructuring Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Financing Receivable, Modifications [Line Items]        
Average balance of TDR loans $ 950 $ 1,181 $ 996 $ 1,198
Interest income recognized on TDR loans 9 10 21 20
Commercial Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Average balance of TDR loans 247 439 288 453
Interest income recognized on TDR loans 1 2 6 5
Commercial Loans [Member] | Real Estate, Including Construction [Member]        
Financing Receivable, Modifications [Line Items]        
Average balance of TDR loans 0 31 0 31
Commercial Loans [Member] | Business and Corporate Banking [Member]        
Financing Receivable, Modifications [Line Items]        
Average balance of TDR loans 137 265 156 277
Interest income recognized on TDR loans 0 1 4 4
Commercial Loans [Member] | Global Banking [Member]        
Financing Receivable, Modifications [Line Items]        
Average balance of TDR loans 110 143 132 145
Interest income recognized on TDR loans 1 1 2 1
Consumer Loans [Member]        
Financing Receivable, Modifications [Line Items]        
Average balance of TDR loans 703 742 708 745
Interest income recognized on TDR loans 8 8 15 15
Consumer Loans [Member] | Residential Mortgage [Member]        
Financing Receivable, Modifications [Line Items]        
Average balance of TDR loans 664 708 670 712
Interest income recognized on TDR loans 7 7 14 14
Consumer Loans [Member] | Home Equity Mortgages [Member]        
Financing Receivable, Modifications [Line Items]        
Average balance of TDR loans 35 30 34 29
Interest income recognized on TDR loans 1 1 1 1
Consumer Loans [Member] | Credit Cards [Member]        
Financing Receivable, Modifications [Line Items]        
Average balance of TDR loans $ 4 $ 4 $ 4 $ 4