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Financial Statements of HSBC USA Inc. (Parent) Balance Sheet (Phantom) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]      
Securities held-to-maturity, allowance for credit losses [2] $ 2 [1] $ 2  
Securities held-to-maturity, fair value 9,369   $ 13,431
2021 6,480    
2022 2,886    
2023 1,521    
2024 1,457    
2025 3,854    
Thereafter 3,781    
HSBC USA Inc [Member]      
Condensed Financial Statements, Captions [Line Items]      
Securities held-to-maturity, allowance for credit losses 1    
Securities held-to-maturity, fair value 2   $ 2
2021 3,000    
2022 2,900    
2023 1,500    
2024 1,500    
2025 3,800    
Thereafter $ 800    
[1] As discussed in Note 2, "Summary of Significant Accounting Policies and New Accounting Pronouncements," beginning January 1, 2020, an allowance for credit losses is recognized for debt securities while, prior to January 1, 2020, debt securities were assessed for other-than-temporary impairment. At December 31, 2019, we did not consider any of our debt securities to be other-than-temporarily impaired.
[2] See Note 5, "Securities," for additional information regarding the allowance for credit losses associated with our security portfolios.