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Related Party Transactions - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]      
Long-term debt   $ 25,746,000,000 $ 26,697,000,000
Notional value of derivative contracts   3,792,188,000,000 4,807,851,000,000
Preferred stock issued   1,265,000,000 1,265,000,000
HNAH [Member]      
Related Party Transaction [Line Items]      
Long-term debt   4,900,000,000 7,800,000,000
Maximum borrowing capacity   150,000,000 150,000,000
Amount outstanding under the loan agreement   0 0
Preferred stock issued   1,265,000,000 1,265,000,000
Preferred stock outstanding   1,265,000,000 1,265,000,000
HMUS [Member]      
Related Party Transaction [Line Items]      
Extended loans and lines of credit   12,000,000,000 12,000,000,000
Amount outstanding on line of credit   1,400,000,000 2,300,000,000
Loans and leases receivable from related parties   1,438,000,000 2,296,000,000
Other HSBC affiliates [Member]      
Related Party Transaction [Line Items]      
Extended loans and lines of credit   4,700,000,000 4,700,000,000
Amount outstanding on line of credit   0 0
Loans and leases receivable from related parties   127,000,000 47,000,000
HSBC Affiliates [Member]      
Related Party Transaction [Line Items]      
Long-term debt   4,865,000,000 7,848,000,000
Loans and leases receivable from related parties   1,565,000,000 2,343,000,000
Notional value of derivative contracts   912,200,000,000 1,111,500,000,000
Fair value of derivative assets and liabilities   167,000,000 $ 90,000,000
Fixed Rate Note Maturing May 2021 [Member] | HNAH [Member] | Subordinated Debt [Member]      
Related Party Transaction [Line Items]      
Long-term debt   2,000,000,000  
Floating Rate Note Maturing May 2025 [Member] | HNAH [Member] | Subordinated Debt [Member]      
Related Party Transaction [Line Items]      
Long-term debt   900,000,000  
Fixed Rate Note Maturing September 2025 [Member] | HNAH [Member] | Senior debt [Member]      
Related Party Transaction [Line Items]      
Long-term debt   $ 2,000,000,000  
Deposits [Member]      
Related Party Transaction [Line Items]      
Fixed-rate senior debt obligations recharacterized as time deposits $ 3,000,000,000    
Deposits [Member] | Fixed Rate Note Maturing March 2021 [Member]      
Related Party Transaction [Line Items]      
Fixed-rate senior debt obligations recharacterized as time deposits 1,500,000,000    
Deposits [Member] | Fixed Rate Note Maturing March 2026 [Member]      
Related Party Transaction [Line Items]      
Fixed-rate senior debt obligations recharacterized as time deposits $ 1,500,000,000