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Related Party Transactions - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]          
Long-term debt $ 30,628,000,000   $ 30,628,000,000 $ 34,966,000,000  
Repayments of Long-term Debt     14,704,000,000 8,948,000,000 $ 4,869,000,000
Derivative, notional amount 5,556,668,000,000   5,556,668,000,000 4,793,784,000,000  
Preferred stock issued 1,265,000,000   1,265,000,000 1,265,000,000  
Preferred stock outstanding 1,265,000,000   1,265,000,000 1,265,000,000  
HNAH [Member]          
Related Party Transaction [Line Items]          
Long-term debt 7,800,000,000   7,800,000,000 4,900,000,000  
Repayments of Long-term Debt 4,000,000,000        
Maximum borrowing capacity 150,000,000   150,000,000 150,000,000  
Amount outstanding under the loan agreement 0   0 0  
Preferred stock issued 1,265,000,000   1,265,000,000 1,265,000,000  
Preferred stock outstanding 1,265,000,000   1,265,000,000 1,265,000,000  
HSBC Finance Corporation (HSBC Finance) [Member] | Extended Uncommitted Revolving Credit Facility [Member]          
Related Party Transaction [Line Items]          
Credit agreement, prepayment fee paid   $ 28,000,000      
HMUS [Member]          
Related Party Transaction [Line Items]          
Extended loans and lines of credit 12,800,000,000   12,800,000,000 7,900,000,000  
Loans and leases receivable from related parties 2,235,000,000   2,235,000,000 6,690,000,000  
Amount outstanding on line of credit 2,200,000,000   2,200,000,000 6,700,000,000  
HSI [Member]          
Related Party Transaction [Line Items]          
Overnight loan       5,000,000,000  
Other HSBC affiliates [Member]          
Related Party Transaction [Line Items]          
Extended loans and lines of credit 3,900,000,000   3,900,000,000    
Loans and leases receivable from related parties 39,000,000   39,000,000 60,000,000  
Amount outstanding on line of credit 0   0 0  
HSBC Affiliates [Member]          
Related Party Transaction [Line Items]          
Long-term debt 7,845,000,000   7,845,000,000 4,841,000,000  
Loans and leases receivable from related parties 2,274,000,000   2,274,000,000 6,750,000,000  
Derivative, notional amount 809,500,000,000   809,500,000,000 768,400,000,000  
Fair value of derivative assets and liabilities 108,000,000   108,000,000 $ 64,000,000  
Fixed Rate Note Maturing March 2021 [Member] | HNAH [Member] | Senior debt [Member]          
Related Party Transaction [Line Items]          
Debt issued 1,500,000,000   1,500,000,000    
Fixed Rate Note Maturing May 2021 [Member] | HNAH [Member] | Senior debt [Member]          
Related Party Transaction [Line Items]          
Debt issued 2,000,000,000   2,000,000,000    
Floating Rate Note Maturing May 2025 [Member] | HNAH [Member] | Subordinated Debt [Member]          
Related Party Transaction [Line Items]          
Debt issued 900,000,000   900,000,000    
Fixed Rate Note Maturing September 2025 [Member] | HNAH [Member] | Senior debt [Member]          
Related Party Transaction [Line Items]          
Debt issued 2,000,000,000   2,000,000,000    
Fixed Rate Note Maturing March 2026 [Member] | HNAH [Member] | Senior debt [Member]          
Related Party Transaction [Line Items]          
Debt issued $ 1,500,000,000   $ 1,500,000,000