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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

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