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Loans - Summary of TDR and Related Credit Loss Reserves for TDR Loans (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Carrying Value of TDR Loans [1],[2],[3] $ 720 $ 859
Unpaid Principal Balance of TDR Loans [1],[2],[3] 866 1,004
Allowance for credit losses on TDR Loans [4] 7 17
Commercial Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Carrying Value of TDR Loans [2],[3],[5] 104 181
Unpaid Principal Balance of TDR Loans [2],[3],[5] 139 205
Allowance for credit losses on TDR Loans [4] 1 12
Commercial Loans [Member] | Business and Corporate Banking [Member]    
Financing Receivable, Impaired [Line Items]    
Carrying Value of TDR Loans [2],[3] 36 68
Unpaid Principal Balance of TDR Loans [2],[3] 61 86
Allowance for credit losses on TDR Loans [4] 1 12
Commercial Loans [Member] | Global Banking [Member]    
Financing Receivable, Impaired [Line Items]    
Carrying Value of TDR Loans [2],[3] 68 113
Unpaid Principal Balance of TDR Loans [2],[3] 78 119
Allowance for credit losses on TDR Loans [4] 0 0
Consumer Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Carrying Value of TDR Loans [2],[3] 616 678
Unpaid Principal Balance of TDR Loans [2],[3] 727 799
Allowance for credit losses on TDR Loans [4] 6 5
Consumer Loans [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Carrying Value of TDR Loans [2],[3],[6] 580 640
Unpaid Principal Balance of TDR Loans [2],[3],[6] 663 730
Allowance for credit losses on TDR Loans [4] 4 3
Consumer Loans [Member] | Home Equity Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Carrying Value of TDR Loans [2],[3],[6] 32 35
Unpaid Principal Balance of TDR Loans [2],[3],[6] 60 65
Allowance for credit losses on TDR Loans [4] 1 1
Consumer Loans [Member] | Credit Cards [Member]    
Financing Receivable, Impaired [Line Items]    
Carrying Value of TDR Loans [2],[3] 4 3
Unpaid Principal Balance of TDR Loans [2],[3] 4 4
Allowance for credit losses on TDR Loans [4] $ 1 $ 1
[1] At December 31, 2019 and 2018, the carrying value of TDR Loans includes $230 million and $286 million, respectively, of loans which are classified as nonaccrual.
[2] TDR Loans are considered to be impaired loans. For commercial loans, impaired loans include other loans in addition to TDR Loans which totaled $164 million and $54 million at December 31, 2019 and 2018, respectively.
[3] The carrying value of TDR Loans includes basis adjustments on the loans, such as partial charge-offs.
[4] Included in the allowance for credit losses.
[5] Additional commitments to lend to commercial borrowers whose loans have been modified in TDR Loans totaled $222 million and $151 million at December 31, 2019 and 2018, respectively.
[6] At December 31, 2019 and 2018, the carrying value of consumer mortgage TDR Loans includes $557 million and $615 million, respectively, of loans that are recorded at the lower of amortized cost or fair value of the collateral less cost to sell.