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Investment securities (Investments Classified by Credit Rating) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | $ 1,390 | $ 1,568
Agency mortgage-backed residential |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 1,376 |
Asset-backed |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 14 |
AAA Rating |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 14 |
AAA Rating | Agency mortgage-backed residential |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 0 |
AAA Rating | Asset-backed |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 14 |
AA Rating |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 1,376 |
AA Rating | Agency mortgage-backed residential |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | 1,376 |
AA Rating | Asset-backed |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity securities | $ 0 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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