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Related Party Transactions - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]        
Long-term debt   $ 18,105,000,000   $ 19,979,000,000
Repayments of long-term debt   8,402,000,000 $ 8,387,000,000  
Notional value of derivative contracts   1,606,786,000,000   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   5,500,000,000   2,900,000,000
Repayments of long-term debt $ 850,000,000      
Maximum borrowing capacity   4,000,000,000    
Amount outstanding under the loan agreement   0   0
Loans receivable from related parties   1,000,000,000   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
Amount outstanding on line of credit   1,800,000,000   1,100,000,000
Loans receivable from related parties   1,755,000,000   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   102,000,000   12,000,000
HSBC Affiliates [Member]        
Related Party Transaction [Line Items]        
Long-term debt   5,528,000,000   2,878,000,000
Loans receivable from related parties   2,857,000,000   1,100,000,000
Notional value of derivative contracts   785,100,000,000   923,600,000,000
Fair value of derivative assets and liabilities   215,000,000   $ 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    
Fixed Rate Note Maturing June 2030 [Member] | HNAH [Member] | Senior debt [Member]        
Related Party Transaction [Line Items]        
Long-term debt   1,500,000,000    
Fixed Rate Note Maturing June 2025 [Member] | HNAH [Member] | Senior debt [Member]        
Related Party Transaction [Line Items]        
Long-term debt   $ 2,000,000,000