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Investment securities (Investments Classified by Credit Rating) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | $ 4,655 | $ 4,680
Agency mortgage-backed residential |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 984 | 999
Mortgage-backed residential |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 3,544 | 3,603
Asset-backed |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 127 | 78
AAA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 3,560 | 3,570
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 | 3,442 | 3,497
AAA | Asset-backed |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 118 | 73
AA |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 1,077 | 1,094
AA | Agency mortgage-backed residential |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 984 | 999
AA | Mortgage-backed residential |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 89 | 93
AA | Asset-backed |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 4 | 2
A |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 16 | 15
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 | 13 | 13
A | Asset-backed |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 3 | 2
BBB |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 2 | 1
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 | $ 2 | $ 1

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