v3.26.1
Retained Earnings and Regulatory Capital Requirements - Narrative (Details)
$ in Millions
3 Months Ended
Jun. 30, 2026
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Payment of dividends on common stock $ 300
HSBC Bank USA  
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]  
Payment of dividends on common stock $ 300