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Investment securities - Schedule of Investments Classified by Credit Rating (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities $ 4,433 $ 4,346
Agency mortgage-backed residential    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 1,284 935
Mortgage-backed residential    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 3,091 3,323
Asset-backed    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 58 88
AAA    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 3,074 3,322
AAA | Agency mortgage-backed residential    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 0 0
AAA | Mortgage-backed residential    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 3,021 3,241
AAA | Asset-backed    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 53 81
AA    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 1,355 1,016
AA | Agency mortgage-backed residential    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 1,284 935
AA | Mortgage-backed residential    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 69 78
AA | Asset-backed    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 2 3
A    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 3 6
A | Agency mortgage-backed residential    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 0 0
A | Mortgage-backed residential    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 1 4
A | Asset-backed    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 2 2
BBB    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 1 2
BBB | Agency mortgage-backed residential    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 0 0
BBB | Mortgage-backed residential    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities 0 0
BBB | Asset-backed    
Schedule of Held-to-maturity Securities [Line Items]    
Held-to-maturity securities $ 1 $ 2