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Related Party Transactions - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]      
Long-term debt $ 18,179,000,000   $ 19,979,000,000
Repayments of long-term debt 4,071,000,000 $ 2,864,000,000  
Notional value of derivative contracts 1,751,830,000,000   2,021,133,000,000
Preferred stock issued 1,265,000,000   1,265,000,000
HNAH [Member]      
Related Party Transaction [Line Items]      
Long-term debt 3,500,000,000   2,900,000,000
Repayments of long-term debt 850,000,000    
Maximum borrowing capacity 4,000,000,000.0    
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 11,600,000,000   12,000,000,000.0
Amount outstanding on line of credit 1,600,000,000   1,100,000,000
Loans receivable from related parties 1,591,000,000   1,088,000,000
Other HSBC affiliates [Member]      
Related Party Transaction [Line Items]      
Extended loans and lines of credit 3,900,000,000   4,700,000,000
Amount outstanding on line of credit 0   0
Loans receivable from related parties 61,000,000   12,000,000
HSBC Affiliates [Member]      
Related Party Transaction [Line Items]      
Long-term debt 3,528,000,000   2,878,000,000
Loans receivable from related parties 1,652,000,000   1,100,000,000
Notional value of derivative contracts 835,000,000,000.0   923,600,000,000
Fair value of derivative assets and liabilities 110,000,000   $ 66,000,000
Fixed Rate Note Maturing September 2025 [Member] | HNAH [Member] | Senior debt [Member]      
Related Party Transaction [Line Items]      
Long-term debt 2,000,000,000.0    
Fixed Rate Note Maturing June 2030 [Member] | HNAH [Member] | Senior debt [Member]      
Related Party Transaction [Line Items]      
Long-term debt $ 1,500,000,000